What it does

Metformin mainly:

• Reduces the amount of glucose made by the liver
• Helps the body respond better to insulin
• Helps keep blood sugar from rising too high after meals

It is not insulin and usually doesn’t cause low blood sugar when taken by itself.

Why someone might be prescribed 500 mg

500 mg is a common starting or maintenance strength. The appropriate dose depends on the person’s age, kidney function, other medicines, and reason for taking it.

Common side effects include nausea, diarrhea, stomach discomfort, and a metallic taste, especially when starting it. Taking it with food can help.

Because you’re under 18, don’t start, stop, or change the dose based on this explanation—take it only if it was prescribed for you and follow the instructions from your doctor or pharmacist.