metformin (generic name)

It is used to treat type 2 diabetes
(met FOR min)
Table of Contents
powered by healthline

Average Ratings

What is this medicine?

METFORMIN (met FOR min) is used to treat type 2 diabetes. It helps to control blood sugar. Treatment is combined with diet and exercise. This medicine can be used alone or with other medicines for diabetes.

What should I tell my health care provider before I take this medicine?

They need to know if you have any of these conditions:
  • anemia
  • frequently drink alcohol-containing beverages
  • become easily dehydrated
  • heart attack
  • heart failure that is treated with medications
  • kidney disease
  • liver disease
  • polycystic ovary syndrome
  • serious infection or injury
  • vomiting
  • an unusual or allergic reaction to metformin, other medicines, foods, dyes, or preservatives
  • pregnant or trying to get pregnant
  • breast-feeding

How should I use this medicine?

Take this medicine by mouth. Take it with meals. Swallow the tablets with a drink of water. Follow the directions on the prescription label. Take your medicine at regular intervals. Do not take your medicine more often than directed.

Talk to your pediatrician regarding the use of this medicine in children. While this drug may be prescribed for children as young as 10 years of age for selected conditions, precautions do apply.

What if I miss a dose?

If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

What may interact with this medicine?

Do not take this medicine with any of the following medications:
  • dofetilide
  • gatifloxacin
  • certain contrast medicines given before X-rays, CT scans, MRI, or other procedures

This medicine may also interact with the following medications:

  • digoxin
  • diuretics
  • female hormones, like estrogens or progestins and birth control pills
  • isoniazid
  • medicines for blood pressure, heart disease, irregular heart beat
  • morphine
  • nicotinic acid
  • phenothiazines like chlorpromazine, mesoridazine, prochlorperazine, thioridazine
  • phenytoin
  • procainamide
  • quinidine
  • quinine
  • ranitidine
  • steroid medicines like prednisone or cortisone
  • stimulant medicines for attention disorders, weight loss, or to stay awake
  • thyroid medicines
  • trimethoprim
  • vancomycin

What should I watch for while using this medicine?

Visit your doctor or health care professional for regular checks on your progress.

Learn how to check your blood sugar. Learn the symptoms of low and high blood sugar and how to manage them.

If you have low blood sugar, eat or drink something that has sugar. Make sure others know to get medical help quickly if you have serious symptoms of low blood sugar, like if you become unconscious or have a seizure.

If you need surgery or if you will need a procedure with contrast drugs, tell your doctor or health care professional that you are taking this medicine.

Wear a medical identification bracelet or chain to say you have diabetes, and carry a card that lists all your medications.

What side effects may I notice from receiving this medicine?

Side effects that you should report to your doctor or health care professional as soon as possible:
  • allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
  • breathing problems
  • feeling faint or lightheaded, falls
  • low blood sugar (ask your doctor or health care professional for a list of these symptoms)
  • muscle aches or pains
  • slow or irregular heartbeat
  • unusual stomach pain or discomfort
  • unusually tired or weak

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

  • diarrhea
  • headache
  • heartburn
  • metallic taste in mouth
  • nausea
  • stomach gas, upset

Page: 1 2 Next >
Last Updated: July 06, 2009
Licensed from
Top of page
General Drug Tools
General Drug Tools view all tools
Tools for
Healthy Living
Tools for Healthy Living view all tools
Search Tools
Search Tools view all tools
Insurance Plan Tools
Insurance Plan Tools view all tools

What is a reference number?

When you register on this site, you are assigned a reference number. This number contains your profile information and helps UnitedHealthcare identify you when you come back to the site.

If you searched for a plan on this site in a previous session, you might already have a reference number. This number will contain any information you saved about plans and prescription drugs. To use that reference number, click on the "Change or view saved information" link below.

You can retrieve information from previous visits to this site, such as saved drug lists and Plan Selector information.