Hello These are side effects of REESHAPE 60 mg i.e orlistat . Faecal urgency & incontinence , flatulence, fatty stools or discharge, increased defecation , headache , anxiety , fatigue, menstrual irregularities ( female ), abdominal pain /discomfort, anaphylaxis & angioedema . This is not necessary that all person feel these side effects as these varies from person to person and depend on dose and nature of body ( metabolism rate ) . As you asked about put on weight after stopping the drug ? This is a delicate question ,if some one eat more then required calories , will get weight , if less calories than required no weight gain. Normal person require 1500 -2500 calories /day depending on the work and labor by an individuals . Also weight gainer are fatty foods and sweets , sedentary life . Hope this will clear your doubt .