Here's what rhymes with phenobarbital.

Consider these alternatives

primidone / pyrimidone carbamazepine / oxcarbazepine diazepam / can valproic / heroic azathioprine / line paracetamol / regional bleomycin / rising cyclosporine / seen valium / alien dexamethasone / testimony mitoxantrone / known gabapentin / depending physostigmine / strychnine theophylline / seen amitriptyline / skyline clonazepam / can phenacetin / meeting epinephrine / line