Highlights for metformin
metformin Side Effects
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
- muscle aches or pains
- signs and symptoms of low blood sugar such as feeling anxious, confusion, dizziness, increased hunger, unusually weak or tired, sweating, shakiness, cold, irritable, headache, blurred vision, fast heartbeat, loss of consciousness
- 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):
- metallic taste in mouth
- stomach gas, upset
metformin May Interact with Other Medications
Do not take this medicine with any of the following medications:
- certain contrast medicines given before X-rays, CT scans, MRI, or other procedures
This medicine may also interact with the following medications:
- certain medicines for HIV infection or hepatitis, like adefovir, emtricitabine, entecavir, lamivudine, or tenofovir
- female hormones, like estrogens or progestins and birth control pills
- medicines for blood pressure, heart disease, irregular heart beat
- nicotinic acid
- phenothiazines like chlorpromazine, mesoridazine, prochlorperazine, thioridazine
- steroid medicines like prednisone or cortisone
- stimulant medicines for attention disorders, weight loss, or to stay awake
- thyroid medicines
How to Use metformin
Take this medicine by mouth with a glass of water. Take it with meals. Swallow whole, do not crush or chew. 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. Special care may be needed.
They need to know if you have any of these conditions:
- frequently drink alcohol-containing beverages
- become easily dehydrated
- heart attack
- heart failure
- kidney disease
- liver disease
- polycystic ovary syndrome
- serious infection or injury
- an unusual or allergic reaction to metformin, other medicines, foods, dyes, or preservatives
- pregnant or trying to get pregnant
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.
Visit your doctor or health care professional for regular checks on your progress.
A test called the HbA1C (A1C) will be monitored. This is a simple blood test. It measures your blood sugar control over the last 2 to 3 months. You will receive this test every 3 to 6 months.
Learn how to check your blood sugar. Learn the symptoms of low and high blood sugar and how to manage them.
Always carry a quick-source of sugar with you in case you have symptoms of low blood sugar. Examples include hard sugar candy or glucose tablets. Make sure others know that you can choke if you eat or drink when you develop serious symptoms of low blood sugar, such as seizures or unconsciousness. They must get medical help at once.
Tell your doctor or health care professional if you have high blood sugar. You might need to change the dose of your medicine. If you are sick or exercising more than usual, you might need to change the dose of your medicine.
Do not skip meals. Ask your doctor or health care professional if you should avoid alcohol. Many nonprescription cough and cold products contain sugar or alcohol. These can affect blood sugar.
This medicine may cause ovulation in premenopausal women who do not have regular monthly periods. This may increase your chances of becoming pregnant. You should not take this medicine if you become pregnant or think you may be pregnant. Talk with your doctor or health care professional about your birth control options while taking this medicine. Contact your doctor or health care professional right away if think you are pregnant.
The tablet shell for some brands of this medicine does not dissolve. This is normal. The tablet shell may appear whole in the stool. This is not a cause for concern.
If you are going to need surgery, a MRI, CT scan, or other procedure, tell your doctor that you are taking this medicine. You may need to stop taking this medicine before the procedure.
Wear a medical ID bracelet or chain, and carry a card that describes your disease and details of your medicine and dosage times.
Keep out of the reach of children.
Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Protect from light. Throw away any unused medicine after the expiration date.
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Last Updated: June 2, 2015