Generic name: Metformin Extended-Release Tablets [ met-FOR-min ]
Brand names: Fortamet, Glucophage XR, Glumetza
Drug class: Non-sulfonylureas
Medically reviewed by Drugs.com. Last updated on Apr 8, 2023.
- Rarely, metformin may cause an acid health problem (lactic acidosis). The risk is higher in people who have kidney problems, liver problems, heart failure, use alcohol, or take other drugs like topiramate. The risk is also higher in older people (65 or older) and in people who are having surgery, an exam or test with contrast, or other procedures. If lactic acidosis happens, it can lead to other health problems and can be deadly. Kidney tests may be done while taking this medicine (metformin extended-release tablets).
- Do not take this medicine (metformin extended-release tablets) if you have a very bad infection, low oxygen, or a lot of fluid loss (dehydration).
- Call your doctor right away if you have signs of too much lactic acid in the blood (lactic acidosis) like fast breathing, fast or slow heartbeat, a heartbeat that does not feel normal, very bad upset stomach or throwing up, feeling very sleepy, shortness of breath, feeling very tired or weak, very bad dizziness, feeling cold, or muscle pain or cramps.
Uses of Metformin Extended-Release Tablets:
- It is used to lower blood sugar in patients with high blood sugar (diabetes).
What do I need to tell my doctor BEFORE I take Metformin Extended-Release Tablets?
- If you have an allergy to metformin or any other part of this medicine (metformin extended-release tablets).
- If you are allergic to this medicine (metformin extended-release tablets); any part of this medicine (metformin extended-release tablets); or any other drugs, foods, or substances. Tell your doctor about the allergy and what signs you had.
- If you have any of these health problems: Acidic blood problem, kidney disease, or liver disease.
- If you have had a recent heart attack or stroke.
- If you are not able to eat or drink like normal, including before certain procedures or surgery.
- If you are having an exam or test with contrast or have had one within the past 48 hours, talk with your doctor.
This is not a list of all drugs or health problems that interact with this medicine (metformin extended-release tablets).
Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take this medicine (metformin extended-release tablets) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.
What are some things I need to know or do while I take Metformin Extended-Release Tablets?
- Tell all of your health care providers that you take this medicine (metformin extended-release tablets). This includes your doctors, nurses, pharmacists, and dentists.
- Talk with your doctor before you drink alcohol.
- Do not drive if your blood sugar has been low. There is a greater chance of you having a crash.
- Check your blood sugar as you have been told by your doctor.
- Have blood work checked as you have been told by the doctor. Talk with the doctor.
- It may be harder to control blood sugar during times of stress such as fever, infection, injury, or surgery. A change in physical activity, exercise, or diet may also affect blood sugar.
- Follow the diet and workout plan that your doctor told you about.
- If diarrhea happens or you are throwing up, call your doctor. You will need to drink more fluids to keep from losing too much fluid.
- Be careful in hot weather or while being active. Drink lots of fluids to stop fluid loss.
- You may see something that looks like the tablet in your stool. This is normal and not a cause for concern. If you have questions, talk with your doctor.
- If you are 65 or older, use this medicine (metformin extended-release tablets) with care. You could have more side effects.
- There is a chance of pregnancy in women of childbearing age who have not been ovulating. If you want to avoid pregnancy, use birth control while taking this medicine (metformin extended-release tablets).
- Tell your doctor if you are pregnant, plan on getting pregnant, or are breast-feeding. You will need to talk about the benefits and risks to you and the baby.
How is this medicine (Metformin Extended-Release Tablets) best taken?
Use this medicine (metformin extended-release tablets) as ordered by your doctor. Read all information given to you. Follow all instructions closely.
- Take with meals.
- Keep taking this medicine (metformin extended-release tablets) as you have been told by your doctor or other health care provider, even if you feel well.
- Take with the evening meal if taking once daily.
- Swallow whole. Do not chew, break, or crush.
- If you have trouble swallowing, talk with your doctor.
What do I do if I miss a dose?
- Skip the missed dose and go back to your normal time unless your doctor tells you to do something else.
- Do not take 2 doses at the same time or extra doses.
What are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Very bad belly pain.
- It is common to have stomach problems like upset stomach, throwing up, or diarrhea when you start taking this medicine (metformin extended-release tablets). If you have stomach problems later during treatment, call your doctor right away. This may be a sign of an acid health problem in the blood (lactic acidosis).
- Low blood sugar can happen. The chance may be raised when this medicine (metformin extended-release tablets) is used with other drugs for diabetes. Signs may be dizziness, headache, feeling sleepy or weak, shaking, fast heartbeat, confusion, hunger, or sweating. Call your doctor right away if you have any of these signs. Follow what you have been told to do for low blood sugar. This may include taking glucose tablets, liquid glucose, or some fruit juices.
What are some other side effects of Metformin Extended-Release Tablets?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
- Stomach pain or diarrhea.
- Upset stomach or throwing up.
- Feeling tired or weak.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at https://www.fda.gov/medwatch.
If OVERDOSE is suspected:
If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
How do I store and/or throw out Metformin Extended-Release Tablets?
- Store at room temperature.
- Store in a dry place. Do not store in a bathroom.
- Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
- Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.
Consumer Information Use and Disclaimer
- If your symptoms or health problems do not get better or if they become worse, call your doctor.
- Do not share your drugs with others and do not take anyone else's drugs.
- Some drugs may have another patient information leaflet. Check with your pharmacist. If you have any questions about this medicine (metformin extended-release tablets), please talk with your doctor, nurse, pharmacist, or other health care provider.
- If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
Frequently asked questions
- What is the safest diabetes medication?
- Does metformin cause weight loss?
- What are the symptoms of lactic acidosis caused by metformin?
- Does metformin cause hypoglycemia?
- Why does Metformin smell like fish?
- Is Invokana the same as metformin?
- How long does glucophage/Metformin stay in your system?
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