Hi, Thanks for posting in HCM. I understand your concern. Practin Tablet contains Cyproheptadine as active ingredient. It is primarily used to treat allergic reactions. It is a sedating antihistamine with antimuscarinic, serotonin antagonist and Calcium channel blocking properties. Thus, it prevents the growth and propagation of allergic symptoms. It is indicated to be used in Allergic Conditions, Migraine and Other vascular headaches. Common side effects associated by taking this medication include: nausea, loss of appetite, drowsiness, dry mouth and sedation. It is not the right medication given to gain weight. You need to take medications like appetiser and digestive enzyme preparations, which will help you to gain weight substantially over a period of time. Kindly consult Physician for further evaluation and management. Hope the information provided would be helpful. All the best.