<prompt> The drug which blocks both H1 and 5ht2 receptor isPhenoxybenzamineCyproheptadineRitanserinOndonsetron  <response>: Cyproheptadine is an antihistamine used to relieve allergy symptoms such as watery eyes, runny nose, itching eyesnose, sneezing, hives, and itching. It works by blocking a ceain natural substance histamine that your body makes during an allergic reaction. Refer kDT 7e p170 