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Generic Name: metformin (met FOR min)
Brand Names: Fortamet, Glucophage, Glucophage XR, Glumetza. riomet
Metformin is an oral diabetes medicine that helps control blood sugar levels.
Metformin is used together with diet and exercise to improve blood sugar control in adults with type 2 diabetes mellitus.
Metformin is sometimes used together with insulin or other medications, but it is not for treating type 1 diabetes.
You should not use metformin if you have severe kidney disease, metabolic acidosis, or diabetic ketoacidosis (call your doctor for treatment).
If you need to have any type of x-ray or CT scan using a dye that is injected into your veins, you may need to temporarily stop taking metformin.
Though extremely rare, you may develop lactic acidosis, a dangerous build-up of lactic acid in your blood. Call your doctor or get emergency medical help if you have unusual muscle pain, trouble breathing, stomach pain, dizziness, feeling cold, or feeling very weak or tired.
You should not use metformin if you are allergic to it, or if you have:
severe kidney disease; or
metabolic acidosis or diabetic ketoacidosis (call your doctor for treatment).
If you need to have surgery or any type of x-ray or CT scan using a dye that is injected into your veins, you may need to temporarily stop taking metformin. Be sure your caregivers know ahead of time that you are using this medication.
Tell your doctor if you have ever had:
kidney disease (your kidney function may need to be checked before you take this medicine);
high ketone levels in your blood or urine;
heart disease, congestive heart failure;
liver disease; or
if you also use insulin, or other oral diabetes medications.
You may develop lactic acidosis, a dangerous build-up of lactic acid in your blood. This may be more likely if you have other medical conditions, a severe infection, chronic alcoholism, or if you are 65 or older. Ask your doctor about your risk.
Follow your doctor's instructions about using this medicine if you are pregnant. Blood sugar control is very important during pregnancy, and your dose needs may be different during each trimester of pregnancy. Tell your doctor if you become pregnant while taking metformin.
Metformin may stimulate ovulation in a premenopausal woman and may increase the risk of unintended pregnancy. Talk to your doctor about your risk.
You should not breastfeed while using this medicine.
Metformin should not be given to a child younger than 10 years old. Some forms of metformin are not approved for use by anyone younger than 18 years old.
Take metformin exactly as prescribed by your doctor. Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.
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.
Do not crush, chew, or break an extended-release tablet. Swallow it whole.
Measure liquid medicine carefully. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).
Some tablets are made with a shell that is not absorbed or melted in the body. Part of this shell may appear in your stool. This is normal and will not make the medicine less effective.
You may have low blood sugar (hypoglycemia) and feel very hungry, dizzy, irritable, confused, anxious, or shaky. To quickly treat hypoglycemia, eat or drink a fast-acting source of sugar (fruit juice, hard candy, crackers, raisins, or non-diet soda).
Your doctor may prescribe a glucagon injection kit in case you have severe hypoglycemia. Be sure your family or close friends know how to give you this injection in an emergency.
Blood sugar levels can be affected by stress, illness, surgery, exercise, alcohol use, or skipping meals. Ask your doctor before changing your dose or medication schedule.
Metformin is only part of a complete treatment program that may also include diet, exercise, weight control, regular blood sugar testing, and special medical care. Follow your doctor's instructions very closely.
Store at room temperature away from moisture, heat, and light.
Your doctor may have you take extra vitamin B12 while you are taking this medicine. Take only the amount of vitamin B12 that your doctor has prescribed.
Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222. An overdose can cause severe hypoglycemia or lactic acidosis.
Avoid drinking alcohol. It lowers blood sugar and may increase your risk of lactic acidosis.
Get emergency medical help if you have signs of an allergic reaction to metformin: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Some people using this medicine develop lactic acidosis, which can be fatal. Get emergency medical help if you have even mild symptoms such as:
unusual muscle pain;
feeling cold;
trouble breathing;
feeling dizzy, light-headed, tired, or very weak;
stomach pain, vomiting; or
slow or irregular heart rate.
Common metformin side effects may include:
low blood sugar;
nausea, upset stomach; or
diarrhea.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Many drugs can interact with metformin, making it less effective or increasing your risk of lactic acidosis. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed here. Tell your doctor about all your current medicines and any medicine you start or stop using.
Further informationRemember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use metformin only for the indication prescribed.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/27/2021.
Source: Drugs.com Metformin Hcl (www.drugs.com/metformin.html).
Commonly reported side effects of metformin include: lactic acidosis, diarrhea, nausea, nausea and vomiting, vomiting, and flatulence. Other side effects include: asthenia, and decreased vitamin b12 serum concentrate. See below for a comprehensive list of adverse effects.
For the ConsumerApplies to metformin: oral solution, oral tablet, oral tablet extended release
Oral route (Tablet; Tablet, Extended Release; Solution)
Death, hypothermia, hypotension, and resistant bradyarrhythmias have been reported due to metformin-associated lactic acidosis. Onset may be subtle and include nonspecific symptoms such as malaise, myalgia, respiratory distress, somnolence, and abdominal distress; laboratory abnormalities include low pH, increased anion gap and elevated blood lactate. The risk of lactic acidosis increases with renal or hepatic impairment, aged 65 years or older, having a radiological study with contrast, surgery, or other procedures, hypoxic states, and excessive alcohol intake. If lactic acidosis is suspected, metformin hydrochloride should be discontinued, supportive measures started in a hospital setting. Prompt hemodialysis is recommended.
Along with its needed effects, metformin may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur while taking metformin:
More common
Less common
Rare
Some side effects of metformin may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
More common
Less common
For Healthcare Professionals
Applies to metformin: compounding powder, oral solution, oral tablet, oral tablet extended release
GeneralGastrointestinal events such as nausea, vomiting, diarrhea, abdominal pain, and loss of appetite have been frequently reported during therapy initiation and resolve spontaneously in most cases.
Adverse events in the pediatric population appear to be similar in nature and severity to that published in adults.
MetabolicCommon (1% to 10%): Hypoglycemia
Very rare (less than 0.01%): Lactic acidosis
GastrointestinalVery common (10% or more): Diarrhea (53.2%), nausea/vomiting (25.5%), flatulence (12.1%)
Common (1% to 10%): Indigestion, abdominal discomfort, abnormal stools, dyspepsia, loss of appetite
HematologicVery rare (less than 0.01%): Subnormal vitamin B12 levels
OtherCommon (1% to 10%): Asthenia, chills, flu syndrome, accidental injury
HepaticVery rare (less than 0.01%): Liver function test abnormalities, hepatitis
CardiovascularCommon (1% to 10%): Chest discomfort, flushing, palpitation
DermatologicCommon (1% to 10%): Rash, nail disorder, increased sweating
Very rare (less than 0.01%): Erythema, pruritus, urticaria
EndocrineFrequency not reported: Reduction in thyrotropin (TSH) levels
ImmunologicVery common (10% or more): Infection (20.5%)
MusculoskeletalCommon (1% to 10%): Myalgia
Nervous systemCommon (1% to 10%): Lightheadedness, taste disturbances
PsychiatricCommon (1% to 10%): Headache
RespiratoryCommon (1% to 10%): Rhinitis
Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/27/2021.
Source: Drugs.com Metformin Hcl (www.drugs.com/metformin.html).
February 24, 2021
August 28, 2020
August 1, 2020
July 31, 2020
October 1, 2020
September 25, 2020
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