I have been given a prescription for cyproheptadine for my allergies; does this drug cause weight gain and dry mouth?

Cyproheptadine has many more side effects than just dry mouth and weight gain. Other side effects include dizziness, blurry vision, drowsiness, stomach upset, constipation and thick/viscus mucus. These effects are not well tolerated at all. In rare cases, Cyproheptadine may cause your heart to beat fast, cause confusion, anxiety, and difficulty urination. Since the medication can cause dizziness, it is important not to get up rapidly from a lying or seating down position. Like all medications, Cyproheptadine can also cause an allergic reaction that may present as a skin rash, itching, difficulty breathing and face swelling. The drug can also cause dense adhesions and fibrosis in your abdomen that can cause other problems. Best advice, dispose the drug and go get yourself some anti histamine.