Question about a medication

Patient: My mom is allergic to benadryl and she has never taken any type of antihistamine but her doctor prescribed her cyproheptadine to help her sleep. Will she have a reaction to it being she is allergic to benadryl?

Doctor: Hello. Welcome to Ask The Doctor.Cyproheptadine is a different class of drug then Benadryl.Ideally it should not cau se any reaction. In case she gets any reaction then I would say that she might be allergic to this drug also.I hope it helps.Stay Healthy.