1. Name Of The Medicinal Product
ZADITEN TABLETS 1MG
2. Qualitative And Quantitative Composition
Ketotifen hydrogen fumarate 1.38mg (equivalent to 1 mg ketotifen base).
For excipients, see Section 6.1.
3. Pharmaceutical Form
White tablets, 7 mm diameter, with break-line on one side and ZADITEN 1 on the other.
4. Clinical Particulars
4.1 Therapeutic Indications
Symptomatic treatment of allergic conditions including rhinitis and conjunctivitis.
4.2 Posology And Method Of Administration
Adults
1mg twice daily with food. If necessary the dose may be increased to 2mg twice daily.
Children
(From 3 years of age): 1 mg twice daily with food. For patients for whom a tablet form may not be suitable, an alternative dosage form should be considered.
Use in the elderly
No evidence exists that elderly patients require different dosages or show different side-effects from younger patients.
Patients known to be easily sedated should be given 0.5 -1 mg at night for the first few days.
4.3 Contraindications
Hypersensitivity to ketotifen or any of the excipients. A reversible fall in the thrombocyte count in patients receiving ZADITEN® concomitantly with oral anti-diabetic agents has been observed in a few cases. This combination of drugs should therefore be avoided until this phenomenon has been satisfactorily explained.
4.4 Special Warnings And Precautions For Use
Zaditen Tablets contain lactose. Patients with rare hereditary problems of galactose intolerance, of severe lactase deficiency or of glucose-galactose malabsorption should not take this medicine.
Convulsions have been reported very rarely during ZADITEN® therapy. As ZADITEN® may lower the seizure threshold it should be used with caution in patients with a history of epilepsy.
4.5 Interaction With Other Medicinal Products And Other Forms Of Interaction
ZADITEN® may potentiate the effects of sedatives, hypnotics, antihistamines and alcohol. Patients should be warned not to take charge of vehicles or machinery until the effect of ZADITEN® treatment on the individual is known.
4.6 Pregnancy And Lactation
Although there is no evidence of any teratogenic effect, recommendation for ZADITEN® in pregnancy cannot be given. Ketotifen is excreted in breast milk, therefore mothers receiving ZADITEN® should not breast feed.
4.7 Effects On Ability To Drive And Use Machines
During the first few days of treatment with ZADITEN® reactions may be impaired. Patients should be warned not to take charge of vehicles or machinery until the effect of ZADITEN® treatment on the individual is known.
4.8 Undesirable Effects
Adverse reactions (Table 1) are ranked under heading of frequency, the most frequent first, using the following convention: very common (.
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Sedation, dry mouth and dizziness may occur at the beginning of treatment, but usually disappear spontaneously with continued medication. Symptoms of CNS stimulation, such as excitation, irritability, insomnia, and nervousness, have been observed particularly in children.
4.9 Overdose
The reported features of overdose include confusion, drowsiness, nystagmus, headache, disorientation, tachycardia, hypotension, reversible coma; especially in children, hyperexcitability or convulsions. Bradycardia and respiratory depression should be watched for.
Treatment should be symptomatic. Treatment with activated charcoal should be considered if the overdose has been taken within approximately one hour. If necessary, symptomatic treatment and monitoring of the cardiovascular system are recommended; if excitation is present, short acting barbiturates or benzodiazepines may be given.
5. Pharmacological Properties
Pharmacotherapeutic group: Other antihistamines for systemic use, ATC code: R06AX17
5.1 Pharmacodynamic Properties
ZADITEN® is a potent antiallergic drug which inhibits the effects of certain endogenous substances known to be inflammatory mediators. ZADITEN® exerts a non-competitive blocking effect on histamine (H1) receptors.
5.2 Pharmacokinetic Properties
After oral administration the absorption of ZADITEN® is nearly complete. Bioavailability amounts to approximately 50% due to a first pass effect of about 50% in the liver. Maximal plasma concentrations are reached within 2-4 hours. Protein binding is 75%. Ketotifen is eliminated biphasically with a short half-life of 3-5 hours and a longer one of 21 hours. In urine about 1% of the substance is excreted unchanged within 48 hours and 60-70% as metabolites. The main metabolite in the urine is the practically inactive ketotifen-N-glucuronide.
5.3 Preclinical Safety Data
Not stated.
6. Pharmaceutical Particulars
6.1 List Of Excipients
Magnesium stearate, pre-gel cornstarch, maize starch and lactose
6.2 Incompatibilities
None known
6.3 Shelf Life
60 months
6.4 Special Precautions For Storage
Store below 25oC
6.5 Nature And Contents Of Container
PVDC opaque blister pack (60 tablets)
6.6 Special Precautions For Disposal And Other Handling
None
7. Marketing Authorisation Holder
Defiante Farmacêutica, S.A.Rua dos Ferreiros, 2609000-082 Funchal, Portugal
8. Marketing Authorisation Number(S)
PL 24030/0001
9. Date Of First Authorisation/Renewal Of The Authorisation
24 April 1980 / 30 March 2007
10. Date Of Revision Of The Text
1 October 2009
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