I understand u have problem gaining weight. My first Question is, have you been losing weight. If Yes, How much weight have you lost and how long did you take to lose that weight. Do you feel breathless often and are you pale to look at. Do you have another symptoms like chronic cough
. There are many Medications you can follow to gain weight but I would not recommend them yet. If you insist on taking medication there are appetite stimulants like ANOREXIN PLUS available, for example.