Cyprolactin contains Cyproheptadine Hydrochloride I.P., an antihistamine with additional appetite-st...Cyprolactin contains Cyproheptadine Hydrochloride I.P., an antihistamine with additional appetite-stimulating properties. It is used to treat allergic reactions, hay fever, urticaria, and loss of appetite due to chronic illness or malnutrition. Cyproheptadine works by blocking histamine and serotonin receptors, helping in both allergy relief and weight gain.See more