Thursday, 29 September 2016

Mirapexin 0.18 mg tablets





1. Name Of The Medicinal Product



MIRAPEXIN 0.18 mg tablets


2. Qualitative And Quantitative Composition



Each tablet contains 0.25 mg pramipexole dihydrochloride monohydrate equivalent to 0.18 mg pramipexole.



Please note:



Pramipexole doses as published in the literature refer to the salt form.



Therefore, doses will be expressed in terms of both pramipexole base and pramipexole salt (in brackets).



For a full list of excipients, see section 6.1.



3. Pharmaceutical Form



Tablet.



The tablets are white, flat, of oval shape, scored on both sides, and have a code embossed (one side with the code P7, and one side with the Boehringer Ingelheim company symbol).



Tablets can be divided into equal halves.



4. Clinical Particulars



4.1 Therapeutic Indications



MIRAPEXIN is indicated in adults for treatment of the signs and symptoms of idiopathic Parkinson's disease, alone (without levodopa) or in combination with levodopa, i.e. over the course of the disease, through to late stages when the effect of levodopa wears off or becomes inconsistent and fluctuations of the therapeutic effect occur (end of dose or “on off” fluctuations).



MIRAPEXIN is indicated in adults for symptomatic treatment of moderate to severe idiopathic Restless Legs Syndrome in doses up to 0.54 mg of base (0.75 mg of salt) (see section 4.2).



4.2 Posology And Method Of Administration



Posology



Parkinson's disease



The daily dose is administered in equally divided doses 3 times a day.



Initial treatment



Doses should be increased gradually from a starting dose of 0.264 mg of base (0.375 mg of salt) per day and then increased every 5-7 days. Providing patients do not experience intolerable undesirable effects, the dose should be titrated to achieve a maximal therapeutic effect.





























Ascending dose schedule of MIRAPEXIN


    


Week




Dose



(mg of base)




Total Daily Dose



(mg of base)




Dose



(mg of salt)




Total Daily Dose



(mg of salt)




1




3 x 0.088




0.264




3 x 0.125




0.375




2




3 x 0.18




0.54




3 x 0.25




0.75




3




3 x 0.35




1.1




3 x 0.5




1.50



If a further dose increase is necessary the daily dose should be increased by 0.54 mg of base (0.75 mg of salt) at weekly intervals up to a maximum dose of 3.3 mg of base (4.5 mg of salt) per day. However, it should be noted that the incidence of somnolence is increased at doses higher than 1.5 mg (of salt) per day (see section 4.8).



Maintenance treatment



The individual dose of pramipexole should be in the range of 0.264 mg of base (0.375 mg of salt) to a maximum of 3.3 mg of base (4.5 mg of salt) per day. During dose escalation in pivotal studies, efficacy was observed starting at a daily dose of 1.1 mg of base (1.5 mg of salt). Further dose adjustments should be done based on the clinical response and the occurrence of adverse reactions. In clinical trials approximately 5% of patients were treated at doses below 1.1 mg of base (1.5 mg of salt). In advanced Parkinson's disease, pramipexole doses higher than 1.1 mg of base (1.5 mg of salt) per day can be useful in patients where a reduction of the levodopa therapy is intended. It is recommended that the dose of levodopa is reduced during both the dose escalation and the maintenance treatment with MIRAPEXIN, depending on reactions in individual patients (see section 4.5).



Treatment discontinuation



Abrupt discontinuation of dopaminergic therapy can lead to the development of a neuroleptic malignant syndrome. Pramipexole should be tapered off at a rate of 0.54 mg of base (0.75 mg of salt) per day until the daily dose has been reduced to 0.54 mg of base (0.75 mg of salt). Thereafter the dose should be reduced by 0.264 mg of base (0.375 mg of salt) per day (see section 4.4).



Dosing in patients with renal impairment



The elimination of pramipexole is dependent on renal function. The following dose schedule is suggested for initiation of therapy:



Patients with a creatinine clearance above 50 ml/min require no reduction in daily dose or dosing frequency.



In patients with a creatinine clearance between 20 and 50 ml/min, the initial daily dose of MIRAPEXIN should be administered in two divided doses, starting at 0.088 mg of base (0.125 mg of salt) twice a day (0.176 mg of base/0.25 mg of salt daily). A maximum daily dose of 1.57 mg pramipexole base (2.25 mg of salt) should not be exceeded.



In patients with a creatinine clearance less than 20 ml/min, the daily dose of MIRAPEXIN should be administered in a single dose, starting at 0.088 mg of base (0.125 mg of salt) daily. A maximum daily dose of 1.1 mg pramipexole base (1.5 mg of salt) should not be exceeded.



If renal function declines during maintenance therapy the MIRAPEXIN daily dose should be reduced by the same percentage as the decline in creatinine clearance, i.e. if creatinine clearance declines by 30%, then the MIRAPEXIN daily dose should be reduced by 30%. The daily dose can be administered in two divided doses if creatinine clearance is between 20 and 50 ml/min and as a single daily dose if creatinine clearance is less than 20 ml/min.



Dosing in patients with hepatic impairment



Dose adjustment in patients with hepatic failure is probably not necessary, as approx. 90% of absorbed active substance is excreted through the kidneys. However, the potential influence of hepatic insufficiency on MIRAPEXIN pharmacokinetics has not been investigated.



Paediatric population



The safety and efficacy of MIRAPEXIN in children below 18 years has not been established. There is no relevant use of MIRAPEXIN in the paediatric population in Parkinson's Disease.



Restless Legs Syndrome



The recommended starting dose of MIRAPEXIN is 0.088 mg of base (0.125 mg of salt) taken once daily 2-3 hours before bedtime. For patients requiring additional symptomatic relief, the dose may be increased every 4-7 days to a maximum of 0.54 mg of base (0.75 mg of salt) per day (as shown in the table below).

























Dose Schedule of MIRAPEXIN


  


Titration Step




Once Daily Evening Dose



(mg of base)




Once Daily Evening Dose



(mg of salt)




1




0.088




0.125




2*




0.18




0.25




3*




0.35




0.50




4*




0.54




0.75




* if needed


  


Patient's response should be evaluated after 3 months treatment and the need for treatment continuation should be reconsidered. If treatment is interrupted for more than a few days it should be re-initiated by dose titration carried out as above.



Treatment discontinuation



Since the daily dose for the treatment of Restless Legs Syndrome will not exceed 0.54 mg of base (0.75 mg of salt) MIRAPEXIN can be discontinued without tapering off. In a 26 week placebo controlled trial, rebound of RLS symptoms (worsening of symptom severity as compared to baseline) was observed in 10% of patients (14 out of 135) after abrupt discontinuation of treatment. This effect was found to be similar across all doses.



Dosing in patients with renal impairment



The elimination of pramipexole is dependent on renal function. Patients with a creatinine clearance above 20 ml/min require no reduction in daily dose.



The use of MIRAPEXIN has not been studied in haemodialysis patients, or in patients with severe renal impairment.



Dosing in patients with hepatic impairment



Dose adjustment in patients with hepatic failure is not required, as approx. 90% of absorbed active substance is excreted through the kidneys.



Paediatric population



MIRAPEXIN is not recommended for use in children and adolescents below 18 years due to a lack of data on safety and efficacy.



Tourette Disorder



Paediatric population



MIRAPEXIN is not recommended for use in children and adolescents below 18 years since the efficacy and safety has not been established in this population. MIRAPEXIN should not be used in children or adolescents with Tourette Disorder because of a negative benefit-risk balance for this disorder (see section 5.1).



Method of administration



The tablets should be taken orally, swallowed with water, and can be taken either with or without food.



4.3 Contraindications



Hypersensitivity to the active substance or to any of the excipients.



4.4 Special Warnings And Precautions For Use



When prescribing MIRAPEXIN in a patient with Parkinson's disease with renal impairment a reduced dose is suggested in line with section 4.2.



Hallucinations



Hallucinations are known as a side effect of treatment with dopamine agonists and levodopa. Patients should be informed that (mostly visual) hallucinations can occur.



Dyskinesia



In advanced Parkinson's disease, in combination treatment with levodopa, dyskinesia can occur during the initial titration of MIRAPEXIN. If they occur, the dose of levodopa should be decreased.



Sudden onset of sleep and somnolence



Pramipexole has been associated with somnolence and episodes of sudden sleep onset, particularly in patients with Parkinson's disease. Sudden onset of sleep during daily activities, in some cases without awareness or warning signs, has been reported uncommonly. Patients must be informed of this and advised to exercise caution while driving or operating machines during treatment with MIRAPEXIN. Patients who have experienced somnolence and/or an episode of sudden sleep onset must refrain from driving or operating machines. Furthermore a reduction of the dose or termination of therapy may be considered. Because of possible additive effects, caution should be advised when patients are taking other sedating medicinal products or alcohol in combination with pramipexole (see sections 4.5, 4.7 and section 4.8).



Impulse control disorders and compulsive behaviours



Pathological gambling, increased libido and hypersexuality have been reported in patients treated with dopamine agonists for Parkinson's disease, including MIRAPEXIN. Furthermore, patients and caregivers should be aware of the fact that other behavioural symptoms of impulse control disorders and compulsions such as binge eating and compulsive shopping can occur. Dose reduction/tapered discontinuation should be considered.



Patients with psychotic disorders



Patients with psychotic disorders should only be treated with dopamine agonists if the potential benefits outweigh the risks. Co-administration of antipsychotic medicinal products with pramipexole should be avoided (see section 4.5).



Ophthalmologic monitoring



Ophthalmologic monitoring is recommended at regular intervals or if vision abnormalities occur.



Severe cardiovascular disease



In case of severe cardiovascular disease, care should be taken. It is recommended to monitor blood pressure, especially at the beginning of treatment, due to the general risk of postural hypotension associated with dopaminergic therapy.



Neuroleptic malignant syndrome



Symptoms suggestive of neuroleptic malignant syndrome have been reported with abrupt withdrawal of dopaminergic therapy (see section 4.2).



Augmentation



Reports in the literature indicate that treatment of Restless Legs Syndrome with dopaminergic medicinal products can result in augmentation. Augmentation refers to the earlier onset of symptoms in the evening (or even the afternoon), increase in symptoms, and spread of symptoms to involve other extremities. Augmentation was specifically investigated in a controlled clinical trial over 26 weeks. Augmentation was observed in 11.8% of patients in the pramipexole group (N = 152) and 9.4% of patients in the placebo group (N = 149). Kaplan-Meier analysis of time to augmentation showed no significant difference between pramipexole and placebo groups.



4.5 Interaction With Other Medicinal Products And Other Forms Of Interaction



Plasma protein binding



Pramipexole is bound to plasma proteins to a very low (< 20%) extent, and little biotransformation is seen in man. Therefore, interactions with other medicinal products affecting plasma protein binding or elimination by biotransformation are unlikely. As anticholinergics are mainly eliminated by biotransformation, the potential for an interaction is limited, although an interaction with anticholinergics has not been investigated. There is no pharmacokinetic interaction with selegiline and levodopa.



Inhibitors/competitors of active renal elimination pathway



Cimetidine reduced the renal clearance of pramipexole by approximately 34%, presumably by inhibition of the cationic secretory transport system of the renal tubules. Therefore, medicinal products that are inhibitors of this active renal elimination pathway or are eliminated by this pathway, such as cimetidine, amantadine, mexiletine, zidovudine, cisplatin, quinine, and procainamide, may interact with pramipexole resulting in reduced clearance of pramipexole. Reduction of the pramipexole dose should be considered when these medicinal products are administered concomitantly with MIRAPEXIN.



Combination with levodopa



When MIRAPEXIN is given in combination with levodopa, it is recommended that the dose of levodopa is reduced and the dose of other anti-parkinsonian medicinal products is kept constant while increasing the dose of MIRAPEXIN.



Because of possible additive effects, caution should be advised when patients are taking other sedating medicinal products or alcohol in combination with pramipexole (see section 4.4, 4.7 and 4.8).



Antipsychotic medicinal products



Co-administration of antipsychotic medicinal products with pramipexole should be avoided (see section 4.4), e.g. if antagonistic effects can be expected.



4.6 Pregnancy And Lactation



Pregnancy



The effect on pregnancy and lactation has not been investigated in humans. Pramipexole was not teratogenic in rats and rabbits, but was embryotoxic in the rat at maternotoxic doses (see section 5.3). MIRAPEXIN should not be used during pregnancy unless clearly necessary, i.e. if the potential benefit justifies the potential risk to the foetus.



Breast-feeding



As pramipexole treatment inhibits secretion of prolactin in humans, inhibition of lactation is expected. The excretion of pramipexole into breast milk has not been studied in women. In rats, the concentration of active substance-related radioactivity was higher in breast milk than in plasma.



In the absence of human data, MIRAPEXIN should not be used during breast-feeding. However, if its use is unavoidable, breast-feeding should be discontinued.



Fertility



No studies on the effect on human fertility have been conducted. In animal studies, pramipexole affected oestrous cycles and reduced female fertility as expected for a dopamine agonist. However, these studies did not indicate direct or indirect harmful effects with respect to male fertility.



4.7 Effects On Ability To Drive And Use Machines



MIRAPEXIN can have a major influence on the ability to drive and use machines.



Hallucinations or somnolence can occur.



Patients being treated with MIRAPEXIN and presenting with somnolence and/or sudden sleep episodes must be informed to refrain from driving or engaging in activities where impaired alertness may put themselves or others at risk of serious injury or death (e.g. operating machines) until such recurrent episodes and somnolence have resolved (see also sections 4.4, 4.5 and 4.8).



4.8 Undesirable Effects



Expected adverse reactions



The following adverse reactions are expected under the use of MIRAPEXIN: abnormal dreams, amnesia, behavioural symptoms of impulse control disorders and compulsions such as binge eating, compulsive shopping, hypersexuality and pathological gambling; cardiac failure, confusion, constipation, delusion, dizziness, dyskinesia, dyspnoea, fatigue, hallucinations, headache, hiccups, hyperkinesia, hyperphagia, hypotension, insomnia, libido disorders, nausea, paranoia, peripheral oedema, pneumonia, pruritus, rash and other hypersensitivity; restlessness, somnolence, sudden onset of sleep, syncope, visual impairment including diplopia, vision blurred and visual acuity reduced, vomiting, weight decrease including decreased appetite, weight increase.



Based on the analysis of pooled placebo-controlled trials, comprising a total of 1,923 patients on pramipexole and 1,354 patients on placebo, adverse drug reactions were frequently reported for both groups. 63% of patients on pramipexole and 52% of patients on placebo reported at least one adverse drug reaction.



Tables 1 and 2 display the frequency of adverse drug reactions from placebo-controlled clinical trials in Parkinson's disease and Restless Legs Syndrome. The adverse drug reactions reported in these tables are those events that occurred in 0.1% or more of patients treated with pramipexole and were reported significantly more often in patients taking pramipexole than placebo, or where the event was considered clinically relevant. The majority of adverse drug reactions were mild to moderate, they usually start early in therapy and most tended to disappear even as therapy was continued.



Within the system organ classes, adverse reactions are listed under headings of frequency (number of patients expected to experience the reaction), using the following categories: very common (



Parkinson's disease, most common adverse reactions



The most commonly (



Table 1: Parkinson's disease




























































System Organ Class




Adverse Drug Reaction




Infections and infestations


 


Uncommon




pneumonia




Psychiatric disorders


 


Common




abnormal dreams, behavioural symptoms of impulse control disorders and compulsions, confusion, hallucinations, insomnia




Uncommon




binge eating1, compulsive shopping, delusion, hyperphagia1, hypersexuality, libido disorder, paranoia, pathological gambling, restlessness




Nervous system disorders


 


Very common




dizziness, dyskinesia, somnolence




Common




headache




Uncommon




amnesia, hyperkinesia, sudden onset of sleep, syncope




Eye disorders


 


Common




visual impairment including diplopia, vision blurred and visual acuity reduced




Cardiac disorders


 


Uncommon




cardiac failure1




Vascular disorders


 


Common




hypotension




Respiratory, thoracic, and mediastinal disorders


 


Uncommon




dyspnoea, hiccups




Gastrointestinal disorders


 


Very common




nausea




Common




constipation, vomiting




Skin and subcutaneous tissue disorders


 


Uncommon




hypersensitivity, pruritus, rash




General disorders and administration site conditions


 


Common




fatigue, peripheral oedema




Investigations


 


Common




weight decrease including decreased appetite




Uncommon




weight increase



1This side effect has been observed in post-marketing experience. With 95 % certainty, the frequency category is not greater than uncommon, but might be lower. A precise frequency estimation is not possible as the side effect did not occur in a clinical trial database of 2,762 patients with Parkinson's Disease treated with pramipexole.



Restless Legs Syndrome, most common adverse reactions



The most commonly (



Table 2: Restless Legs Syndrome


























































System Organ Class




Adverse Drug Reaction




Infections and infestations


 


Uncommon




Pneumonia1




Psychiatric disorders


 


Common




abnormal dreams, insomnia




Uncommon




behavioural symptoms of impulse control disorders and compulsions such as binge eating, compulsive shopping, hypersexuality, and pathological gambling1; confusion, delusion1, hallucinations, hyperphagia1, libido disorder, paranoia1, restlessness




Nervous system disorders


 


Common




dizziness, headache, somnolence




Uncommon




amnesia1, dyskinesia, hyperkinesia1, sudden onset of sleep, syncope




Eye disorders


 


Uncommon




visual disturbance including diplopia, vision blurred and visual acuity reduced




Cardiac disorders


 


Uncommon




cardiac failure1




Vascular disorders


 


Uncommon




hypotension




Respiratory, thoracic, and mediastinal disorders


 


Uncommon




dyspnoea, hiccups




Gastrointestinal disorders


 


Very common




nausea




Common




constipation, vomiting




Skin and subcutaneous tissue disorders


 


Uncommon




hypersensitivity, pruritus, rash




General disorders and administration site conditions


 


Common




fatigue




Uncommon




peripheral oedema




Investigations


 


Uncommon




weight decrease including decreased appetite, weight increase



1This side effect has been observed in post-marketing experience. With 95 % certainty, the frequency category is not greater than uncommon, but might be lower. A precise frequency estimation is not possible as the side effect did not occur in a clinical trial database of 1,395 patients with Restless Legs Syndrome treated with pramipexole.



Somnolence



Pramipexole is commonly associated with somnolence and has been associated uncommonly with excessive daytime somnolence and sudden sleep onset episodes (see also section 4.4).



Libido disorders



Pramipexole may uncommonly be associated with libido disorders (increased or decreased).



Impulse control disorders and compulsive behaviours



Patients treated with dopamine agonists for Parkinson's disease, including MIRAPEXIN, especially at high doses, have been reported as exhibiting signs of pathological gambling, increased libido and hypersexuality, generally reversible upon reduction of the dose or treatment discontinuation (see also section 4.4).



In a cross-sectional, retrospective screening and case-control study including 3,090 Parkinson's disease patients, 13.6% of all patients receiving dopaminergic or non-dopaminergic treatment had symptoms of an impulse control disorder during the past six months. Manifestations observed include pathological gambling, compulsive shopping, binge eating, and compulsive sexual behaviour (hypersexuality). Possible independent risk factors for impulse control disorders included dopaminergic treatments and higher doses of dopaminergic treatment, younger age (



Cardiac failure



In clinical studies and post-marketing experience cardiac failure has been reported in patients with pramipexole. In a pharmacoepidemiological study pramipexole use was associated with an increased risk of cardiac failure compared with non-use of pramipexole (observed risk ratio 1.86; 95% CI, 1.21-2.85).



4.9 Overdose



There is no clinical experience with massive overdose. The expected adverse reactions would be those related to the pharmacodynamic profile of a dopamine agonist, including nausea, vomiting, hyperkinesia, hallucinations, agitation and hypotension. There is no established antidote for overdose of a dopamine agonist. If signs of central nervous system stimulation are present, a neuroleptic agent may be indicated. Management of the overdose may require general supportive measures, along with gastric lavage, intravenous fluids, administration of activated charcoal and electrocardiogram monitoring.



5. Pharmacological Properties



5.1 Pharmacodynamic Properties



Pharmacotherapeutic group: anti-Parkinson drugs, dopamine agonists, ATC code: N04BC05.



Pramipexole is a dopamine agonist that binds with high selectivity and specificity to the D2 subfamily of dopamine receptors of which it has a preferential affinity to D3 receptors, and has full intrinsic activity.



Pramipexole alleviates parkinsonian motor deficits by stimulation of dopamine receptors in the striatum. Animal studies have shown that pramipexole inhibits dopamine synthesis, release, and turnover.



The mechanism of action of pramipexole as treatment for Restless Legs Syndrome is unknown. Neuropharmacological evidence suggests primary dopaminergic system involvement.



In human volunteers, a dose-dependent decrease in prolactin was observed. In a clinical trial with healthy volunteers, where MIRAPEXIN prolonged-release tablets were titrated faster (every 3 days) than recommended up to 3.15 mg pramipexole base (4.5 mg of salt) per day, an increase in blood pressure and heart rate was observed. Such effect was not observed in patient studies.



Clinical trials in Parkinson's disease



In patients pramipexole alleviates signs and symptoms of idiopathic Parkinson's disease. Placebo-controlled clinical trials included approximately 1,800 patients of Hoehn and Yahr stages I – V treated with pramipexole. Out of these, approximately 1,000 were in more advanced stages, received concomitant levodopa therapy, and suffered from motor complications.



In early and advanced Parkinson's disease, efficacy of pramipexole in controlled clinical trials was maintained for approximately six months. In open continuation trials lasting for more than three years there were no signs of decreasing efficacy.



In a controlled double blind clinical trial of 2 year duration, initial treatment with pramipexole significantly delayed the onset of motor complications, and reduced their occurrence compared to initial treatment with levodopa. This delay in motor complications with pramipexole should be balanced against a greater improvement in motor function with levodopa (as measured by the mean change in UPDRS-score). The overall incidence of hallucinations and somnolence was generally higher in the escalation phase with the pramipexole group. However, there was no significant difference during the maintenance phase. These points should be considered when initiating pramipexole treatment in patients with Parkinson's disease.



The European Medicines Agency has waived the obligation to submit the results of studies with MIRAPEXIN in all subsets of the paediatric population in Parkinson's Disease (see section 4.2 for information on paediatric use).



Clinical trials in Restless Legs Syndrome



The efficacy of pramipexole was evaluated in four placebo-controlled clinical trials in approximately 1,000 patients with moderate to very severe idiopathic Restless Legs Syndrome.



The mean change from baseline in the Restless Legs Syndrome Rating Scale (IRLS) and the Clinical Global Impression-Improvement (CGI-I) were the primary efficacy outcome measures. For both primary endpoints statistically significant differences have been observed for the pramipexole dose groups 0.25 mg, 0.5 mg and 0.75 mg pramipexole salt in comparison to placebo. After 12 weeks of treatment the baseline IRLS score improved from 23.5 to 14.1 points for placebo and from 23.4 to 9.4 points for pramipexole (doses combined). The adjusted mean difference was -4.3 points (CI 95% -6.4; -2.1 points, p-value <0.0001). CGI-I responder rates (improved, very much improved) were 51.2% and 72.0% for placebo and pramipexole, respectively (difference 20% CI 95%: 8.1%; 31.8%, p<0.0005). Efficacy was observed with 0.088 mg of base (0.125 mg of salt) per day after the first week of treatment.



In a placebo-controlled polysomnography study over 3 weeks MIRAPEXIN significantly reduced the number of periodic limb movements during time in bed.



Longer term efficacy was evaluated in a placebo-controlled clinical trial. After 26 weeks of treatment, there was an adjusted mean reduction in IRLS total score of 13.7 and 11.1 points in the pramipexole and placebo group, respectively, with a statistically significant (p = 0.008) mean treatment difference of -2.6. CGI-I responder rates (much improved, very much improved) were 50.3% (80/159) and 68.5% (111/162) for placebo and pramipexole, respectively (p = 0.001), corresponding to a number needed to treat (NNT) of 6 patients (95%CI: 3.5, 13.4).



The European Medicines Agency has deferred the obligation to submit the results of studies with MIRAPEXIN in one or more subsets of the paediatric population in Restless Legs Syndrome (see section 4.2 for information on paediatric use).



Clinical trial in Tourette Disorder



The efficacy of pramipexole (0.0625-0.5 mg/day) with paediatric patients aged 6-17 years with Tourette Disorder was evaluated in a 6-week, double-blind, randomised, placebo-controlled flexible dose study. A total of 63 patients were randomised (43 on pramipexole, 20 on placebo). The primary endpoint was change from baseline on the Total Tic Score (TTS) of the Yale Global Tic Severity Scale (YGTSS). No difference was observed for pramipexole as compared to placebo for either the primary endpoint or for any of the secondary efficacy endpoints including YGTSS total score, Patient Global Impression of Improvement (PGI-I), Clinical Global Impression of Improvement (CGI-I), or Clinical Global Impressions of Severity of Illness (CGI-S). Adverse events occurring in at least 5% of patients in the pramipexole group and more common in the pramipexole-treated patients than in patients on placebo were: headache (27.9%, placebo 25.0%), somnolence (7.0%, placebo 5.0%), nausea (18.6%, placebo 10.0%), vomiting (11.6%, placebo 0.0%), upper abdominal pain (7.0%, placebo 5.0%), orthostatic hypotension (9.3%, placebo 5.0%), myalgia (9.3%, placebo 5.0%), sleep disorder (7.0%, placebo 0.0%), dyspnoea (7.0%, placebo 0.0%) and upper respiratory tract infection (7.0%, placebo 5.0%). Other significant adverse events leading to discontinuation of study medication for patients receiving pramipexole were confusional state, speech disorder and aggravated condition (see section 4.2).



5.2 Pharmacokinetic Properties



Pramipexole is rapidly and completely absorbed following oral administration. The absolute bioavailability is greater than 90% and the maximum plasma concentrations occur between 1 and 3 hours. Concomitant administration with food did not reduce the extent of pramipexole absorption, but the rate of absorption was reduced. Pramipexole shows linear kinetics and a small inter-patient variation of plasma levels. In humans, the protein binding of pramipexole is very low (< 20%) and the volume of distribution is large (400 l). High brain tissue concentrations were observed in the rat (approx. 8-fold compared to plasma).



Pramipexole is metabolised in man only to a small extent.



Renal excretion of unchanged pramipexole is the major route of elimination. Approximately 90% of 14C-labelled dose is excreted through the kidneys while less than 2% is found in the faeces. The total clearance of pramipexole is approximately 500 ml/min and the renal clearance is approximately 400 ml/min. The elimination half-life (t½) varies from 8 hours in the young to 12 hours in the elderly.



5.3 Preclinical Safety Data



Repeated dose toxicity studies showed that pramipexole exerted functional effects, mainly involving the CNS and female reproductive system, and probably resulting from an exaggerated pharmacodynamic effect of pramipexole.



Decreases in diastolic and systolic pressure and heart rate were noted in the minipig, and a tendency to a hypotensive effect was discerned in the monkey.



The potential effects of pramipexole on reproductive function have been investigated in rats and rabbits. Pramipexole was not teratogenic in rats and rabbits but was embryotoxic in the rat at maternally toxic doses. Due to the selection of animal species and the limited parameters investigated, the adverse effects of pramipexole on pregnancy and male fertility have not been fully elucidated.



A delay in sexual development (i.e., preputial separation and vaginal opening) was observed in rats. The relevance for humans is unknown.



Pramipexole was not genotoxic. In a carcinogenicity study, male rats developed Leydig cell hyperplasia and adenomas, explained by the prolactin-inhibiting effect of pramipexole. This finding is not clinically relevant to man. The same study also showed that, at doses of 2 mg/kg (of salt) and higher, pramipexole was associated with retinal degeneration in albino rats. The latter finding was not observed in pigmented rats, nor in a 2-year albino mouse carcinogenicity study or in any other species investigated.



6. Pharmaceutical Particulars



6.1 List Of Excipients



Mannitol



maize starch



anhydrous colloidal silica



povidone K 25



magnesium stearate



6.2 Incompatibilities



Not applicable.



6.3 Shelf Life



3 years



6.4 Special Precautions For Storage



Do not store above 30°C.



Store in the original package in order to protect from light.



6.5 Nature And Contents Of Container



OPA/aluminium/PVC-aluminium blisters.



Each blister strip contains 10 tablets.



Cartons containing 3 or 10 blister strips (30 or 100 tablets).



Not all pack sizes may be marketed.



6.6 Special Precautions For Disposal And Other Handling



No special requirements.



7. Marketing Authorisation Holder



Boehringer Ingelheim International GmbH



Binger Strasse 173



D-55216 Ingelheim am Rhein



Germany



8. Marketing Authorisation Number(S)



EU/1/97/051/003-004



9. Date Of First Authorisation/Renewal Of The Authorisation



Date of first authorisation: 23 February 1998



Date of latest renewal: 23 Februar

Wednesday, 28 September 2016

Guiatuss




In the US, Guiatuss (codeine/guaifenesin systemic) is a member of the drug class expectorants and is used to treat Bronchitis and Cough.

US matches:

  • Guiatuss AC Liquid

  • Guiatuss AC

Ingredient matches for Guiatuss



Guaifenesin

Guaifenesin is reported as an ingredient of Guiatuss in the following countries:


  • United States

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MXL capsules 30 mg, 60 mg, 90 mg, 120 mg, 150 mg, 200 mg







MXL 30 mg, 60 mg, 90 mg, 120 mg, 150 mg and 200 mg prolonged-release capsules


Morphine sulphate



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In this leaflet:


1. What MXL capsules are and what they are used for

2. Before you take MXL capsules

3. How to take MXL capsules

4. Possible side effects

5. How to store MXL capsules

6. Further information





What MXL capsules are and what they are used for


These capsules have been prescribed for you by your doctor to relieve severe pain over a period of 24 hours. They contain the active ingredient morphine which belongs to a group of medicines called strong analgesics or ‘painkillers’.




Before you take MXL capsules



Do not take MXL capsules if:


  • you are allergic (hypersensitive) to morphine or any of the other ingredients of the capsules (see section 6 ‘Further Information’);

  • you have breathing problems, such as obstructive airways disease or respiratory depression. Your doctor will have told you if you have these conditions. Symptoms may include breathlessness, coughing or breathing more slowly or weakly than expected;

  • you have a head injury that causes a severe headache or makes you feel sick. This is because the capsules may make these symptoms worse or hide the extent of the head injury;

  • you have a condition where the small bowel (part of your gut) does not work properly (paralytic ileus), your stomach empties more slowly than it should (delayed gastric emptying) or you have severe pain in your abdomen;

  • you have recent onset liver disease;

  • you are taking a type of medicine known as a monoamine oxidase inhibitor (examples include tranylcypromide, phenelzine, isocarboxazid, moclobemide and linezolid), or you have taken this type of medicine in the last two weeks;

  • the patient is under one year of age.

If you are going to have an operation, please tell the doctor at the hospital that you are taking these capsules.




Take special care with MXL capsules


Before treatment with these capsules tell your doctor or pharmacist if you:


  • have breathing problems, such as impaired lung function. Your doctor will have told you if you have this condition. Symptoms may include breathlessness and coughing;

  • have an under-active thyroid gland (hypothyroidism), kidney or long-term liver problems as you may need a lower dose;

  • have a severe headache or feel sick as this may indicate that the pressure in your skull is increased;

  • suffer from seizures, fits or convulsions;

  • have low blood pressure;

  • have a severe heart problem after long-term lung disease (severe cor pulmonale);

  • have inflammation of the pancreas (which causes severe pain in the abdomen and back) or problems with your gall bladder;

  • have an inflammatory bowel disorder;

  • have prostate problems;

  • have poor adrenal gland function (your adrenal gland is not working properly which may cause symptoms including weakness, weight loss, dizziness, feeling or being sick);

  • are or have ever been addicted to alcohol or drugs;

  • have previously suffered from withdrawal symptoms such as agitation, anxiety, shaking or sweating, upon stopping taking alcohol or drugs.



Taking other medicines


Please tell your doctor or pharmacist if you are taking or have recently taken any other medicines, including medicines obtained without a prescription. If you take these capsules with some other medicines, the effect of the capsules or the other medicine may be changed.


These capsules must not be used together with a monoamine oxidase inhibitor, or if you have taken this type of medicine in the last two weeks (see section 2 ‘Do not take…’).


Tell your doctor or pharmacist if you are taking:


  • medicines to help you sleep (for example tranquillisers, hypnotics or sedatives);

  • medicines to treat psychiatric or mental disorders (such as phenothiazines);

  • muscle relaxants;

  • medicines to treat high blood pressure;

  • cimetidine to treat stomach ulcers, indigestion or heartburn;

  • other strong analgesics or ‘painkillers’ (such as buprenorphine, nalbuphine or pentazocine);

  • rifampicin to treat tuberculosis;

  • ritonavir to treat HIV.

Also tell your doctor if you have recently been given an anaesthetic.




Taking MXL capsules with alcohol


Drinking alcohol during your treatment with these capsules may make you sleepy. If you are affected you should avoid drinking alcohol.




Pregnancy and breastfeeding


Do not take these capsules if you are pregnant or breastfeeding.


Ask your doctor or pharmacist for advice before taking any medicine.




Driving and using machines


These capsules may cause a number of side effects such as drowsiness which could affect your ability to drive or use machinery (see section 4 for a full list of side effects). These are usually most noticeable when you first start taking the capsules, or when changing to a higher dose. If you are affected you should not drive or use machinery.





How to take MXL capsules


Always take the capsules exactly as your doctor has told you. The label on your medicine will tell you how many capsules to take and how often.


Swallow your capsules whole with a glass of water. If you prefer, you can open your capsules and sprinkle the contents on to cold soft food, such as yogurt. Do not crush, dissolve or chew the capsule contents.




MXL capsules are designed to work properly over 24 hours. If the capsule contents are crushed, dissolved or chewed, the entire 24-hour dose may be absorbed rapidly into your body. This can be dangerous, causing serious problems such as an overdose, which may be fatal.


You should take your capsules every 24 hours. For instance, if you take a capsule at 8 o’clock in the morning, you should take your next capsule at 8 o’clock the next morning.


You must only take the capsules by mouth.



Adults


The usual starting dose is one 60 mg capsule every 24 hours. However, the dose will depend on your age, weight and the severity of your pain. If you are elderly or weigh less that 70 kg your doctor may suggest a starting dose of one 30 mg capsule every 24 hours. Your doctor will decide how many capsules you should take.



Children over one year of age


Children over one year of age can take these capsules. The required dose will depend on their weight and severity of pain. This should be discussed with your doctor or pharmacist.


If you find that you are still in pain whilst taking these capsules discuss this with your doctor.


Do not exceed the dose recommended by your doctor. You should check with your doctor or pharmacist if you are not sure.



If you take more MXL capsules than you should or if someone accidentally swallows your capsules


Call your doctor or hospital straight away. People who have taken an overdose may feel very sleepy, sick or dizzy. They may also have breathing difficulties leading to unconsciousness or even death and may need emergency treatment in hospital. When seeking medical attention make sure that you take this leaflet and any remaining capsules with you to show to the doctor.




If you forget to take MXL capsules


If you remember within 16 hours of the time your capsule was due, take your capsule straight away. Take your next capsule at your normal time. If you are more than 16 hours late, please call your doctor for advice. Do not take a double dose to make up for a forgotten capsule.




If you stop taking MXL capsules


You should not suddenly stop taking these capsules unless your doctor tells you to. If you want to stop taking your capsules, discuss this with your doctor first. They will tell you how to do this, usually by reducing the dose gradually so you do not experience unpleasant effects. Withdrawal symptoms such as agitation, anxiety, shaking or sweating may occur if you suddenly stop taking these capsules.



If you have any further questions on the use of this medicine, ask your doctor or pharmacist.




Possible side effects


Like all medicines, these capsules can cause side effects, although not everybody gets them.


All medicines can cause allergic reactions, although serious allergic reactions are uncommon. Tell your doctor immediately if you get any sudden wheeziness, difficulties in breathing, swelling of the eyelids, face or lips, rash or itching especially those covering your whole body.


The most serious side effect is a condition where you breathe more slowly or weakly than expected (respiratory depression).


As with all strong painkillers, there is a risk that you may become addicted or reliant on these capsules.



Common side effects (probably affecting more than 1 in 100 people taking these capsules)


  • Constipation (your doctor can prescribe a laxative to overcome this problem).

  • Feeling or being sick (this should normally wear off after a few days, however your doctor can prescribe an anti-sickness medicine if it continues to be a problem).

  • Drowsiness (this is most likely when you first start taking your capsules or when your dose is increased, but it should wear off after a few days).

  • Dry mouth, loss of appetite, indigestion, abdominal pain or discomfort.

  • Headache, confusion, difficulty in sleeping, abnormal thoughts.

  • A feeling of unusual weakness.

  • Difficulty in breathing or wheezing, decreased cough reflex.

  • Involuntary muscle contractions or spasms.

  • An increase in the severity of symptoms associated with inflammation of the pancreas (severe pain in the abdomen and back).

  • Rash or itchy skin.

  • Sweating.


Uncommon side effects (probably affecting fewer than 1 in 100 people taking these capsules)


  • Gastrointestinal disorders (e.g. upset stomach), changes in taste.

  • A feeling of dizziness or ‘spinning’, fainting, seizures, fits or convulsions.

  • Agitation, unpleasant or uncomfortable mood, mood changes, hallucinations, a feeling of extreme happiness.

  • Generally feeling unwell.

  • Tingling or numbness.

  • Difficulty in passing urine.

  • Impotence, decreased sexual drive, absence of menstrual periods.

  • High or low blood pressure, facial flushing (redness of the face).

  • A fast or slow heart beat, palpitations.

  • Swelling of the hands, ankles or feet.

  • Blurred vision, reduction in size of the pupils in the eye.

Uncommonly, these capsules may affect the results of blood tests to check that your liver is working properly.



If any of the side effects become serious, or if you notice any side effects not listed in this leaflet, please tell your doctor or pharmacist.




How to store MXL capsules


Keep out of the reach and sight of children.


Do not use any capsules after the expiry date which is stated on the blister and carton. EXP 08 2010 means that you should not take the capsules after the last day of that month i.e. August 2010.


Do not store your capsules above 25°C.


Do not take your capsules if they are broken or crushed as this can be dangerous and can cause serious problems such as overdose.


Medicines should not be disposed of via wastewater or household waste. Ask your pharmacist how to dispose of medicines no longer required. These measures will help to protect the environment.




Further information



What MXL capsules contain


The active ingredient is morphine sulphate. Each capsule contains 30 mg, 60 mg, 90 mg, 120 mg, 150 mg or 200 mg of morphine sulphate.


The other ingredients are:


  • Hydrogenated vegetable oil

  • Macrogol

  • Talc

  • Magnesium stearate

  • Gelatin

  • Sodium dodecyl sulphate

  • Shellac

  • Iron oxide (E172)

  • Propylene glycol

  • Titanium dioxide (E171)

The capsules also contain the following colourants:


30 mg, 60 mg & 120 mg - Indigo carmine (E132)


90 mg - Erythrosine (E127)


150 mg - Erythrosine (E127) and indigo carmine (E132)




What MXL capsules look like and the contents of the pack


The capsules are marked MS OD followed by the strength (e.g. 30, 60 etc).


The capsules are coloured as follows: 30 mg - light blue, 60 mg - brown, 90 mg - pink, 120 mg - olive, 150 mg - blue, 200 mg - rust.


In each box there are 28 capsules.




Marketing Authorisation Holder and Manufacturer


The capsules are made by



Bard Pharmaceuticals Limited

Cambridge Science Park

Milton Road

Cambridge

CB4 0GW

UK


for the marketing authorisation holder



Napp Pharmaceuticals Limited

Cambridge Science Park

Milton Road

Cambridge

CB4 0GW

UK




This leaflet is also available in large print, Braille or as an audio CD. To request a copy, please call the RNIB Medicine Information line (free of charge) on:



0800 198 5000


You will need to give details of the product name and reference number.


These are as follows:


Product name: MXL prolonged-release capsules


Reference number: 16950/0042



This leaflet was last revised in 06/2009




MXL

capsules are protected by European Patent (UK) Nos. 0636370 and


0654263.


MXL and the NAPP device (logo) are Registered Trade Marks.


© 2009 Napp Pharmaceuticals Limited



P0072-A R1V7 UK AW 05-02-09





Tuesday, 27 September 2016

Salmetedur




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Ingredient matches for Salmetedur



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Mysoline 250mg Tablets





1. Name Of The Medicinal Product



'Mysoline'


2. Qualitative And Quantitative Composition



Primidone Ph. Eur. 250 mg



3. Pharmaceutical Form



White uncoated oral tablets.



4. Clinical Particulars



4.1 Therapeutic Indications



'Mysoline' is indicated in the management of grand mal and psychomotor (temporal lobe) epilepsy. It is also of value in the management of focal or Jacksonian seizures, myoclonic jerks and akinetic attacks.



Management of essential tremor.



4.2 Posology And Method Of Administration



Epilepsy: Treatment must always be planned on an individual basis. In many patients it will be possible to use 'Mysoline' alone, but in some, 'Mysoline' will need to be combined with other anticonvulsants or with supporting therapy.



'Mysoline' is usually given twice daily. Begin with 125 mg once daily late in the evening. Every 3 days increase the daily dosage by 125 mg until the patient is receiving 500 mg daily. Thereafter, every 3 days increase the daily dosage by 250 mg in adults or 125 mg in children under 9 years - until control is obtained or the maximum tolerated dosage is being given. This may be as much as 1.5 g a day in adults; 1 g a day in children.



Average daily maintenance doses:



















 



 




Tablets (250mg)




Milligrams




Adults and children over 9 years




3 to 6




750 to 1500




Children 6 to 9 years




3 to 4




750 to 1000




Children 2 to 5 years




2 to 3




500 to 750




Children up to 2 years




1 to 2




250 to 500



The total daily dose is usually best divided and given in two equal amounts, one in the morning and the other in the evening. In certain patients, it may be considered advisable to give a larger dose when the seizures are more frequent. For instance: 1) if the attacks are nocturnal then all or most of the day's dose may be given in the evening; 2) if the attacks are associated with some particular event such as menstruation, a slight increase in the appropriate dose is often beneficial.



Elderly patients: It is advisable to monitor elderly patients with reduced renal function who are receiving primidone.



Patients on other anticonvulsants: Where a patient's attacks are not sufficiently well controlled with other anticonvulsants, or disturbing side effects have arisen, 'Mysoline' may be used to augment or replace existing treatment. First add 'Mysoline' to the current anticonvulsant treatment by the method of gradual introduction described previously. When a worthwhile effect has been achieved and the amount of 'Mysoline' being given has been built up to at least half the estimated requirement, withdrawal of the previous treatment can then be attempted. This should be done gradually over a period of 2 weeks, during which time it may be necessary to increase the 'Mysoline' dosage to maintain control.



Withdrawal of previous treatment should not be too rapid or status epilepticus may occur. Where phenobarbitone formed the major part of the previous treatment, however, both its withdrawal and 'Mysoline' substitution should be made earlier, so as to prevent excessive drowsiness from interfering with accurate assessment of the optimum dosage of 'Mysoline'.



Essential tremor: Initially a dose of 50 mg daily should be introduced using 'Mysoline' Suspension. The daily dose should be increased gradually over a 2 to 3 week period until remission of symptoms or the highest dose tolerated up to a maximum of 750 mg daily.



Patients with essential tremor who have not previously been exposed to anticonvulsants, or other drugs known to induce increased hepatic enzyme activity, may experience acute symptoms of tolerance to 'Mysoline', frequently characterised by vertigo, unsteadiness and nausea. It is, therefore, essential to start such patients at a low dosage (initially 50 mg daily) increasing very slowly up to the maximum tolerated dose or that which produces remission of tremor (up to 750mg daily).



4.3 Contraindications



Patients who exhibit hypersensitivity or an allergic reaction to primidone, to a constituent of the formulation or to phenobarbitone, should not receive the drug. Primidone should not be administered to patients with acute intermittent porphyria.



4.4 Special Warnings And Precautions For Use



'Mysoline' should be given with caution and may be required in reduced dosage in children, the elderly, debilitated patients or those with impaired renal, hepatic or respiratory function.



Primidone is a potent CNS depressant and is partially metabolised to phenobarbitone. After prolonged administration there is a potential for tolerance, dependence and a withdrawal reaction on abrupt cessation of treatment.



Exceptionally, as with phenytoin and phenobarbitone, megaloblastic anaemia may develop requiring discontinuation of primidone. This condition may respond to treatment with folic acid and/or vitamin B12. There have been isolated reports of other blood dyscrasias.



Mysoline has the potential to harm the foetus, see section 4.6 before considering use during pregnancy.



Suicidal ideation and behaviour have been reported in patients treated with anti-epileptic agents in several indications. A meta-analysis of randomised placebo controlled trials of anti-epileptic drugs has also shown a small increased risk of suicidal ideation and behaviour. The mechanism of this risk is not known and the available data do not exclude the possibility of an increased risk for primidone.



Therefore patients should be monitored for signs of suicidal ideation and behaviours and appropriate treatment should be considered. Patients (and caregivers of patients) should be advised to seek medical advice should signs of suicidal ideation or behaviour emerge.



4.5 Interaction With Other Medicinal Products And Other Forms Of Interaction



Both primidone and its major metabolite phenobarbitone are metabolized by, and also induce, liver enzyme activity, principally the CYP 450 3A4 enzyme system..



Agents which inhibit the CYP 450 3A4 enzyme system, such as chloramphenicol, felbamate, nelfinavir*, metronidazole and sodium valproate may result in increased plasma levels of concomitantly administered primidone and its metabolite phenobarbitone.



In addition, St. John's Wort* induces the CYP450 enzyme system and may result in a reduction of plasma levels of concomitantly administered primidone and of its major metabolite phenobarbitone.



Theophylline protein binding may affect phenobarbitone binding, affecting free phenobarbitone levels.



Mysoline therapy may also lead to altered pharmacokinetics in concomitantly administered drugs, whose metabolism may be increased and lead to lowered plasma levels and/or a shorter half-life. These drugs include androgens*, beta-antagonists, carbamazepine, cyclosporin, cloazepine, chloramphenicol, corticosteroids/glucocorticosteroids, cyclophosphamide, dicoumarins, digitoxin*, doxycycline, ethosuxamide, etoposide, felbamate, granisetron, lamotrigine, losartan, methadone*, metronidazole, mainserin, montelukast*, nelfinavir*, nimodipine, oral-contraceptives, oxcarbazepine, phenytoin, quinidine, rocuronium, sodium valproate, tiagabine, theophyllines, topiramate, tricyclic antidepressants, vecuronium, warfarin and zonisamide.



Mysoline inhibits the glucoronidation of paracetamol* and may increase the hepatotoxicity of paracetamol.



The CNS depressant effect of Mysoline is additive to those of other CNS depressants such as alcohol, opiates and barbiturates.



The above interactions are potentially clinically significant.



* No formal interaction studies have been performed. The inclusion of the drug is based on reports of their influence or dependence upon enzyme systems influenced by, or of relevance to the metabolic pathways of primidone or its major metabolite, phenobarbitone.



4.6 Pregnancy And Lactation



Pregnancy: Primidone is suspected to have caused serious birth defects when administered during pregnancy. In infants born of epileptic mothers treated with primidone, there have been reports of congenital abnormalities including congenital heart disease, cleft palate and conditions associated with maternal folate deficiency, including spina bifida, microencephaly and anencephaly. Mysoline should not be used during pregnancy unless clearly necessary to manage epilepsy in the mother where withdrawal of therapy may cause risks or where alternative anti-epileptic managements are unsuitable.



Withdrawal symptoms may occur in the newly born whose mothers have received 'Mysoline' during late pregnancy.



Long-term anticonvulsant therapy can be associated with decreased serum folate levels. As folic acid requirements are also increased during pregnancy, regular screening of patients at risk is advised, and treatment with folic acid and Vitamin B12, although controversial, should be considered.



Anticonvulsant therapy in pregnancy has occasionally been associated with coagulation disorders in the neonates. For this reason pregnant patients should be given Vitamin K1 through the last month of pregnancy up to the time of delivery. In the absence of such pretreatment, 10 mg Vitamin K1 may be given to the mother at the time of delivery and 1 mg should be given immediately to the neonate at risk.



Lactation: During breast feeding the baby should be monitored for sedation.



4.7 Effects On Ability To Drive And Use Machines



As with most other anticonvulsants, patients who drive vehicles or operate machinery should be made aware of the possibility of impaired reaction time.



4.8 Undesirable Effects



If adverse effects do appear, the most common side effects are drowsiness and listlessness but these generally occur only in the beginning of treatment.



Visual disturbances, nausea, headache, dizziness, vomiting, nystagmus and ataxia have been reported but are usually transient even when pronounced. On occasions an idiosyncratic reaction may occur which involves these symptoms in an acute and severe form necessitating withdrawal of treatment.





































Common



( >1/100)




General




Drowsiness




 



 




Central and peripheral nervous system




Listlessness, ataxia, visual disturbances, nystagmus




 



 




Gastrointestinal




Nausea




Less common



(1/100 - 1/1000)




General




Headache, dizziness




 



 




Gastrointestinal




Vomiting




 



 




Dermatological




Allergic reactions particularly affecting the skin can include maculopapular, morbilliform or scarlatiniform rashes.




Rare



(< 1/1000)




Central and peripheral nervous system




Personality changes, which may include psychotic reactions.




 



 




Haematological




Megaloblastic anaemia, blood dyscrasias




 



 




Hepatic




Elevations in hepatic enzymes, including gamma-glutamyl transferase (gamma GT) and alkaline phosphatase.




 



 




Musculoskeletal




Arthralgia, osteomalacia.



 



As with phenobarbitone, Dupuytren's contracture has been reported




 



 




Dermatological




Severe reactions such as exfoliative dermatitis, Stevens-Johnson syndrome, toxic epidermal necrolysis and lupus erythematosus.



Vitamin D supplementation may be needed during long-term Mysoline therapy, since vitamin D catabolism may be increased.



Exceptionally, as with phenytoin and phenobarbitone, megaloblastic anaemia may develop requiring discontinuation of primidone. This condition may respond to treatment with folic acid and/or Vitamin B12.



4.9 Overdose



Primidone is metabolised extensively to phenobarbitone and overdosage leads to varying degrees of CNS depression which, depending on the dose ingested, may include ataxia, loss of consciousness, respiratory depression and coma.



Crystalluria may occur in overdosage and could be used as a helpful diagnostic aid where primidone overdosage is suspected.



Depending on the severity of intoxication, therapy should include aspiration of stomach contents, administration of activated charcoal, administration of intravenous fluids, forced alkaline diuresis (striving for a urine pH of 8.0), and general supportive measures. In more life threatening circumstances, haemoperfusion (if the patient is hypotensive) or haemodialysis are effective.



There is no specific antidote.



5. Pharmacological Properties



5.1 Pharmacodynamic Properties



The activity of 'Mysoline' is due to the anticonvulsant properties of three active moieties, namely primidone itself and its two major metabolites phenobarbitone and phenylethylmalonamide. The relative contribution of these three moieties to the clinical anticonvulsant effect has not been firmly established. Although the precise mode of action of 'Mysoline' is unknown, in common with other anticonvulsants, effects on the neuronal membrane particularly with respect to alteration of ionic fluxes are likely to play a fundamental role.



'Mysoline', as with other anticonvulsants, can induce liver enzymes.



5.2 Pharmacokinetic Properties



'Mysoline' is absorbed rapidly from the gastrointestinal tract, peak plasma levels being attained approximately 3 hours after ingestion. Primidone is well distributed in all organs and tissues: it crosses the blood-brain and placental barriers and is excreted in breast milk. The pharmacokinetics of primidone are complex because of biotransformation into two metabolites, phenobarbitone and phenylethylmalonamide, that have anticonvulsant activity and complex pharmacokinetic properties. Primidone has a plasma half-life of approximately 10 hours which is considerably shorter than those of its principal metabolites.



Primidone and phenylethylmalonamide are bound to plasma proteins to only a small extent, whereas approximately half of phenobarbitone is bound. Approximately 40% of the drug is excreted unchanged in urine.



5.3 Preclinical Safety Data



Primidone is a drug on which extensive clinical experience has been obtained. All relevant information for the prescriber is provided elsewhere in the Summary of Product Characteristics.



6. Pharmaceutical Particulars



6.1 List Of Excipients



Carmellose calcium Ph. Eur.



Gelatin Ph. Eur.



Magnesium stearate Ph. Eur.



Povidone Ph. Eur.



Purified water Ph. Eur.



Stearic acid Ph. Eur.



6.2 Incompatibilities



None known.



6.3 Shelf Life



5 years.



6.4 Special Precautions For Storage



Store below 25°C.



6.5 Nature And Contents Of Container



HDPE bottle (100 tablets).



6.6 Special Precautions For Disposal And Other Handling



To be taken as directed by the prescriber.



7. Marketing Authorisation Holder



Acorus Therapeutics Limited



Office Village



Chester Business Park



Chester



Cheshire



CH4 9QZ.



UK



8. Marketing Authorisation Number(S)



PL 20132/0005



9. Date Of First Authorisation/Renewal Of The Authorisation



14 August 2004



10. Date Of Revision Of The Text



April 2009



11 DOSIMETRY (IF APPLICABLE)


12 INSTRUCTIONS FOR PREPARATION OF RADIOPHARMACEUTICALS (IF APPLICABLE)