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ZONISAMIDE KEY is a brand name for Zonisamide. The medicine, its uses, side effects and dosage are the same regardless of brand.
Used for: Zonisamide is indicated as: • monotherapy in the treatment of partial seizures, with or without secondary generalisation, in adults with newly diagnosed epilepsy (see section 5.1) • adjunctive therapy in the treatment of partial seizures, with or without secondary generalisation, in adults, adolescents, and children…
Verbatim from this product's MHRA label. Tap a section to expand.
Posology Adults Dosage escalation and maintenance Zonisamide may be taken as monotherapy or added to existing therapy in adults. The dose should be titrated on the basis of clinical effect. Recommended escalation and maintenance doses are given in Table 1.
Some patients, especially those not taking CYP3A4-inducing agents, may respond to lower doses. 4). In clinical studies of adult patients, dose reductions of 100 mg at weekly intervals have been used with concurrent adjustment of other anti-epileptic medicine doses (where necessary).
Table 1. Adults – recommended dosage escalation and maintenance regimen Treatment Regimen Titration Phase Usual Maintenance Dose Week 1 + 2 Week 3 + 4 Week 5 + 6Monotherapy - Newly diagnosed adult patients 100 mg/day (once a day) 200 mg/day (once a day) 300 mg/day (once a day) 300 mg per day (once a day).
If a higher dose is required: increase at two- weekly intervals in increments of 100 mg up to a maximum of 500 mg. 5) 50 mg/day (in two divided doses) 100 mg/day (in two divided doses) Increase at weekly intervals in increments of 100 mg 300 to 500 mg per day (once a day or two divided doses).
Week 1 + 2 Week 3 + 4 Week 5 to 10- without CYP3A4-inducing agents; or with renal or hepatic impairment 50 mg/day (in two divided doses) 100 mg/day (in two divided doses) Increase at two-weekly intervals in increments of up to 100 mg 300 to 500 mg per day (once a day or two divided doses).
Some patients may respond to lower doses. General dosing recommendations for zonisamide in special patient populations Paediatric population (aged 6 years and above) Dosage escalation and maintenance Zonisamide must be added to existing therapy for paediatric patients aged 6 years and above.
The dose should be titrated on the basis of clinical effect. Recommended escalation and maintenance doses are given in Table 2. Some patients, especially those not taking CYP3A4-inducing agents, may respond to lower doses. 4: Paediatric population).
Table 2. 5) 1 mg/kg/day (once a day) Increase at weekly intervals in increments of 1 mg/kg 6 to 8 mg/kg/day (once a day) 300 - 500 mg/day (once a day) Week 1 + 2 Weeks ≥ 3- without CYP3A4- inducing agents 1 mg/kg/day (once a day) Increase at two-weekly intervals in increments of 1 mg/kg 6 to 8 mg/kg/day (once a day) 300 - 500 mg/day (once a day) a.
Summary of the safety profile Zonisamide has been administered to over 1,200 patients in clinical studies, more than 400 of whom received zonisamide for at least 1 year. In addition, there has been extensive post-marketing experience with zonisamide in Japan since 1989 and in the USA since 2000.
It should be noted that zonisamide is a benzisoxazole derivative, which contains a sulphonamide group. 4). The most common adverse reactions in controlled adjunctive therapy studies were somnolence, dizziness and anorexia. The most common adverse reactions in a randomised, controlled monotherapy trial comparing zonisamide with carbamazepine prolonged release were decreased bicarbonate, decreased appetite, and decreased weight.
8%. 7%. Tabulated list of adverse reactions Adverse reactions associated with zonisamide obtained from clinical studies and post- marketing surveillance are tabulated below. The frequencies are arranged according to the following scheme: very common ≥ 1/10 common ≥ 1/100 to < 1/10 uncommon ≥ 1/1,000 to < 1/100 rare ≥ 1/10,000 to < 1/1,000 very rare < 1/10,000 not known cannot be estimated from the available data Table 4.
Adverse reactions associated with zonisamide obtained from adjunctive use clinical studies and post-marketing surveillance System Organ Class (MedDRA terminology) Very Common Common Uncommon Very Rare Infections and infestation Pneumonia Urinary tract infection Blood and lymphatic system disorders Ecchymosis Agranulocytosis Aplastic anaemia Leucocytosis Leucopoenia Lymphadenopath y Pancytopenia, Thrombocytopeni a Immune system disorders Hypersensitivity Drug-induced hypersensitivity syndrome Drug rash with eosinophilia and systemic symptoms Metabolism and nutrition disorders Anorexia Hypokalaemia Metabolic acidosis Renal tubular acidosis Psychiatric disorders Agitation Irritability Confusional state Depression Affect lability Anxiety Insomnia Psychotic disorder Anger Aggression Suicidal ideation Suicide attempt Hallucination Nervous system disorders Ataxia Dizziness Memory impairment Somnolence Bradyphrenia Disturbance in attention Nystagmus Paraesthesia Speech disorder Tremor Convulsion Amnesia Coma Grand mal seizure Myasthenic syndrome Neuroleptic malignant syndrome Status epilepticus Eye disorders Diplopia Angle closure glaucoma Eye pain Myopia Vision blurred Visual acuity reduced Respiratory, thoracic and mediastinal disorders Dyspnoea Pneumonia aspiration Respiratory disorder Hypersensitivity- type Pneumonitis Gastrointestin al disorders Abdominal pain Constipation Diarrhoea Vomiting Pancreatitis Dyspepsia Nausea Hepatobiliary disorders Cholecystitis Cholelithiasis Hepatocellular damage Skin and subcutaneous tissue disorders Rash Pruritis Alopecia Anhidrosis Erythema multiforme Stevens-Johnson syndrome Toxic epidermal necrolysis Musculoskelet al and connective tissue disorders Rhabdomyolysis Renal and urinary disorders Nephrolithiasis Calculus urinary Hydronephrosis Renal failure Urine abnormality General disorders and administratio n site conditions Fatigue Influenza-like illness Pyrexia Oedema peripheral Investigations Decreased bicarbonate Weight decreased Blood creatine phosphokinase increased Blood creatinine increased Blood urea increased Liver function tests abnormal Injury, poisoning and procedural complications Heat stroke In addition, there have been isolated cases of Sudden Unexplained Death in Epilepsy Patients (SUDEP) receiving zonisamide.
Unexplained rash Serious rashes occur in association with zonisamide therapy, including cases of Stevens- Johnson syndrome. Consideration must be given to discontinuing zonisamide in patients who develop an otherwise unexplained rash.
All patients who develop a rash while taking zonisamide must be closely supervised, with additional levels of caution applied to those patients receiving concomitant anti-epileptic agents that may independently induce skin rashes. Withdrawal seizures In accordance with current clinical practice, discontinuation of zonisamide in patients with epilepsy must be accomplished by gradual dose reduction, to reduce the possibility of seizures on withdrawal.
There are insufficient data for the withdrawal of concomitant anti-epileptic medicines once seizure control with zonisamide has been achieved in the add-on situation, in order to reach monotherapy with zonisamide. Therefore, withdrawal of concomitant anti-epileptic medicinal products must be undertaken with caution.
Sulphonamide reactions Zonisamide is a benzisoxazole derivative, which contains a sulphonamide group. Serious immune based adverse reactions that are associated with medicinal products containing a sulphonamide group include rash, allergic reaction and major haematological disturbances, including aplastic anaemia, which very rarely can be fatal.
Cases of agranulocytosis, thrombocytopenia, leukopenia, aplastic anaemia, pancytopenia and leucocytosis have been reported. There is inadequate information to assess the relationship, if any, between dose and duration of treatment and these events.
Acute myopia and secondary angle closure glaucoma A syndrome consisting of acute myopia associated with secondary angle closure glaucoma has been reported in adult and paediatric patients receiving zonisamide. Symptoms include acute onset of decreased visual acuity and/or ocular pain.
1 or to sulphonamides.
Not medical advice. Always read the patient information leaflet and follow your prescriber or pharmacist.
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To ensure a therapeutic dose is maintained the weight of a child should be monitored and the dose reviewed as weight changes occur up to a weight of 55 kg. The dose regime is 6-8 mg/kg/day up to a maximum dose of 500 mg/day. The safety and efficacy of zonisamide in children aged below 6 years or those below 20 kg have not yet been established.
There are limited data from clinical studies in patients with a body weight of less than 20 kg. Therefore, children aged 6 years and above and with a body weight less than 20 kg should be treated with caution. It is not always possible to precisely achieve the calculated dose with the commercially available capsule strengths of zonisamide.
In these cases, it is therefore recommended that the zonisamide total dose should be rounded up or down to the nearest available dose that can be achieved with commercially available capsule strengths of zonisamide (25 mg, 50 mg and 100 mg).
4). e. in accordance with the schedule in Table 3). Table 3. Paediatric population (aged 6 years and above) – recommended down-titration schedule Weight Decrease at weekly intervals in increments of: 20 – 28 kg 25 to 50 mg/day* 29 – 41 kg 50 to 75 mg/day* 42 – 55 kg 100 mg/day* >55 kg 100 mg/day* *All doses are once daily.
Elderly Caution should be exercised at initiation of treatment in elderly patients as there is limited information on the use of zonisamide in these patients. 8). Renal impairment Caution must be exercised in treating patients with renal impairment, as there is limited information on use in such patients and a slower titration of zonisamide might be required.
Since zonisamide and its metabolites are excreted renally, it should be discontinued in patients who develop acute renal failure or where a clinically significant sustained increase in serum creatinine is observed. In subjects with renal impairment, renal clearance of single doses of zonisamide was positively correlated with creatinine clearance.
The plasma AUC of zonisamide was increased by 35% in subjects with creatinine clearance < 20 ml/min. Hepatic impairment Use in patients with hepatic impairment has not been studied. Therefore, use in patients with severe hepatic impairment is not recommended.
Caution must be exercised in treating patients with mild to moderate hepatic impairment, and a slower titration of zonisamide may be required. Method of administration Zonisamide capsules are for oral use. 2).
Table
Ophthalmologic findings can include myopia, anterior chamber shallowing, and ocular hyperaemia (redness) and increased intraocular pressure. This syndrome may be associated with supraciliary effusion resulting in anterior displacement of the lens and iris, with secondary angle closure glaucoma.
Symptoms may occur within hours to weeks of initiating therapy. Treatment includes discontinuation of zonisamide, as rapidly as possible in the judgment of the treating physician, and appropriate measures to reduce intraocular pressure.
Elevated intraocular pressure of any aetiology, if left untreated, can lead to serious sequelae including permanent vision loss. Caution should be used when treating patients with history of eye disorders with zonisamide. Suicide ideation and behaviour 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 medicinal products 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 zonisamide.
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.
Kidney stones Some patients, especially those with a predisposition to nephrolithiasis, may be at increased risk for renal stone formation and associated signs and symptoms such as renal colic, renal pain or flank pain. Nephrolithiasis may lead to chronic kidney damage.
Risk factors for nephrolithiasis include prior stone formation, a family history of nephrolithiasis and hypercalciuria. None of these risk factors can reliably predict stone formation during zonisamide treatment. In addition, patients taking other medications associated with nephrolithiasis may be at increased risk.
Increasing fluid intake and urine output may help reduce the risk of stone formation, particularly in those with predisposing risk factors. e. decreased serum bicarbonate below the normal reference range in the absence of chronic respiratory alkalosis) is associated with zonisamide treatment.
This metabolic acidosis is caused by renal bicarbonate loss due to the inhibitory effect of zonisamide on carbonic anhydrase. Such electrolyte imbalance has been observed with the use of zonisamide in placebo-controlled clinical trials and in the post-marketing period.
Generally, zonisamide-induced metabolic acidosis occurs early in treatment although cases can occur at any time during treatment. 5 mEq/l at daily doses of 300 mg in adults); rarely patients can experience more severe decreases. Conditions or therapies that predispose to acidosis (such as renal disease, severe respiratory disorders, status epilepticus, diarrhoea, surgery, ketogenic diet, or medicinal products) may be additive to the bicarbonate lowering effects of zonisamide.
The risk of zonisamide-induced metabolic acidosis appears to be more frequent and severe in younger patients. Appropriate evaluation and monitoring of serum bicarbonate levels should be carried out in patients taking zonisamide who have underlying conditions which might increase the risk of acidosis, in patients who are at an increased risk of adverse consequences of metabolic acidosis and in patients with symptoms suggestive of metabolic acidosis.
If metabolic acidosis develops and persists, consideration should be given to reducing the dose or discontinuing zonisamide (by gradual discontinuation or reduction of a therapeutic dose) as osteopenia may develop. If the decision is made to continue patients on zonisamide in the face of persistent acidosis, alkali treatment should be considered.
Metabolic […]