Cyproheptadine adverse drug interaction with anti-epileptic drugs

Cyproheptadine is a H1 and 5- HT1/2 receptor antagonists, impairing the anticonvulsant activity of antiepileptic drugs and reduces threshold, increases severity of seizures, when administered chronically. Anuj a 13 years old male from Delhi, known case of SSPE stage-III with epilepsy, on oral anti-epileptic drug has seizure induction followed the use of oral cyproheptadine. Stopping cyproheptadine, patient didn’t sustain any further seizures.