Prescription items are NON-RETURNABLE and NON REFUNDABLE Cyproheptadine 4 mg Cyproheptadine is an antihistamine used to relieve allergy symptoms such as watery eyes , runny nose , itching eyes /nose, sneezing , hives , and itching . It works by blocking a certain natural substance ( histamine ) that your body makes during an allergic reaction . This medication also blocks another natural substance in your body (serotonin). 100 Tablets 012TR01-100 P03377 364980123013