The generic name of Gevac is also known as Metformin Hydrochloride Tablets, taking Metformin with diarrhea may result in weight loss, but you need to seek medical attention as soon as possible to clarify the diagnosis. For overweight and obese diabetics, taking metformin is likely to bring about weight loss. It is mainly used to inhibit hepatic glucose output while improving insulin sensitivity and lowering fasting and postprandial blood sugar. Metformin has some gastrointestinal side effects, which may cause nausea, vomiting, and some people even experience diarrhea after taking metformin as an adverse drug reaction. Metformin is not a weight loss drug. If the patient needs to lose weight, it is recommended to consult a doctor in time, under the guidance of the doctor to reduce weight, do not buy weight-loss drugs on their own, so as not to cause adverse consequences.