What should I discuss with my healthcare provider before taking Fortamet (metformin)?
Some people have developed a life-threatening condition called lactic acidosis while taking metformin. Get emergency medical help if you have any of these symptoms of lactic acidosis: weakness, increasing sleepiness, slow heart rate, cold feeling, muscle pain, shortness of breath, stomach pain, feeling light-headed, and fainting. You may be more likely to develop lactic acidosis if you have congestive heart failure. Older adults may also have a higher risk of developing lactic acidosis. Talk with your doctor about your individual risk. Do not use this medication if you are allergic to metformin, if you have kidney disease or kidney failure, or if you are in a state of diabetic ketoacidosis (call your doctor for treatment with insulin). Before taking this medication, tell your doctor if you are allergic to any drugs, or if you have: liver disease; or a history of heart disease If you have any of these conditions, you may not be able to use metformin, or you may need a dosage adjustment
