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In this Article

• What is metformin (Riomet)?
• What are the possible side effects of metformin (Riomet)?
• What is the most important information I should know about metformin (Riomet)?
• What should I discuss with my healthcare provider before taking metformin (Riomet)?
• How should I take metformin (Riomet)?
• What happens if I miss a dose (Riomet)?
• What happens if I overdose (Riomet)?
• What should I avoid while taking metformin (Riomet)?
• What other drugs will affect metformin (Riomet)?
• Where can I get more information?

What should I discuss with my healthcare provider before taking metformin (Riomet)?

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 need a dose adjustment or special tests to safely take metformin.

FDA pregnancy category B. This medication is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment.

It is not known whether metformin passes into breast milk or if it could harm a nursing baby. Do not take metformin without first talking to your doctor if you are breast-feeding a baby.

Metformin should not be given to a child younger than 10 years old. Extended-release metformin (Glucophage XR) should not be given to a child younger than 17 years old.

How should I take metformin (Riomet)?

Take this medication exactly as it was prescribed for you. Do not take the medication in larger amounts, or take it for longer than recommended by your doctor. Follow the directions on your prescription label.

Your doctor may occasionally change your dose to make sure you get the best results from this medication.

Take metformin with a meal, unless your doctor tells you otherwise. Some forms of metformin are taken only once daily with the evening meal. Follow your doctor's instructions.

Metformin is only part of a complete program of treatment that also includes diet, exercise, and weight control. It is important to use this medicine regularly to get the most benefit. Get your prescription refilled before you run out of medicine completely.

Do not crush, chew, or break an extended-release tablet (Glucophage XR). Swallow the pill whole. It is specially made to release medicine slowly in the body. Breaking the pill would cause too much of the drug to be released at one time.

To be sure this medication is helping your condition, your blood will need to be tested on a regular basis. Your kidney function may also need to be tested. It is important that you not miss any scheduled appointments.

Your medication needs may change if you become sick or injured, if you have a serious infection, or if you have any type of surgery. Your doctor may want you to stop taking metformin for a short time if any of these situations affect you.

Take care not to let your blood sugar get too low, causing hypoglycemia. You may have hypoglycemia if you skip a meal, exercise too long, drink alcohol, or are under stress.

Know the signs of low blood sugar (hypoglycemia) and how to recognize them:

• hunger, headache, confusion, irritability;
• drowsiness, weakness, dizziness, tremors;
• sweating, fast heartbeat;
• seizure (convulsions); or
• fainting, coma (severe hypoglycemia can be fatal).

Always keep a source of sugar available in case you have symptoms of low blood sugar. Sugar sources include orange juice, glucose gel, candy, or milk. If you have severe hypoglycemia and cannot eat or drink, use an injection of glucagon. Your doctor can give you a prescription for a glucagon emergency injection kit and tell you how to give the injection.

Your doctor may have you take extra vitamin B12 while you are taking metformin. Take only the amount of vitamin B12 that your doctor has prescribed.

If you need to have any type of x-ray or CT scan using a dye that is injected into a vein, you may need to temporarily stop taking metformin. Be sure the doctor knows ahead of time that you are using this medication.

Store metformin at room temperature away from moisture, heat, and light.