Learn about the side effects of metformin, from common to rare, for consumers and healthcare professionals. Metformin is used alone or with other medications, including insulin, to treat type 2 diabetes (condition in which the body does not use insulin normally and, therefore, cannot control the amount of sugar in the blood). Metformin is a first-line treatment used for type 2 diabetes in adults and children 10 years and older to help improve blood sugar levels. It is also used off-label to improve symptoms of polycystic ovarian syndrome (PCOS) and other conditions. This article describes the dosages of metformin, as well as its strengths and how to take it. When taking metformin, always follow the dosage prescribed by your doctor. Overview: Metformin is medicine you take to help keep your blood sugar from getting too high. Common side effects may include stomach problems, such as diarrhea, nausea, vomiting, stomach pain. Metformin is a medicine that can be used to treat type 2 diabetes, gestational diabetes and the hormone condition polyendocrine metabolic ovarian syndrome (PMOS). However, when comparing metformin to intensive diet or exercise, moderate-quality evidence was found that metformin did not reduce risk of developing type 2 diabetes and very low-quality evidence was found that adding metformin to intensive diet or exercise did not show any advantage or disadvantage in reducing risk of type 2 diabetes when. Metformin is a generic prescription medication used to help manage blood sugar levels in adults and some children with type 2 diabetes. It works by decreasing sugar production in the liver. Metformin is used together with proper diet and exercise to treat high blood sugar levels caused by type 2 diabetes. This medicine reduces the absorption of sugar from the intestines, reduces the release of stored sugar from the liver, and helps your body use sugar better. Metformin is a common treatment for diabetes. But it can cause digestive problems and other side effects. Learn more about the uses and side effects here.