Proconvulsant effect of ketotifen, a histamine H1 antagonist, confirmed by the use of d-chlorpheniramine with monitoring electroencephalography.

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Yokoyama H, Iinuma K, Yanai K, Watanabe T, Sakurai E, Onodera K

Proconvulsant effect of ketotifen, a histamine H1 antagonist, confirmed by the use of d-chlorpheniramine with monitoring electroencephalography.

Methods Find Exp Clin Pharmacol. 1993 Apr;15(3):183-8.

PubMed ID

8101246 [ View in PubMed

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Abstract

Ketotifen produced seizures in a 5-year-old boy with secondary generalized epilepsy (SGE) and allergic rhinitis. To confirm that the seizures were due to histamine H1 receptors blockade, d-chlorpheniramine was administered with monitoring electroencephalography (EEG). Administration of d-chlorpheniramine significantly increased the number of epileptic discharges in the patient, compared with those before administration. Plasma noradrenaline and dopamine levels were not affected by treatment with d-chlorpheniramine. These findings indicate that histamine H1 receptors blockade produced convulsions and increased epileptic discharges on EEG. Recently, several experimental reports have shown that histamine has an inhibitory role on convulsions through histamine H1 receptors. Experimental findings and present results show that histamine H1 antagonists have proconvulsant effects, especially in the developmental period. Thus, it is recommended that centrally-acting histamine H1 antagonists should be avoided in epileptic patients, especially in children of pre-school age.

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Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Ketotifen	Histamine H1 receptor	Protein	Humans	Yes	Antagonist	Details