Can metformin damage you?

Under certain conditions, too much metformin can cause lactic acidosis. The symptoms of lactic acidosis are severe and quick to appear, and usually occur when other health problems not related to the medicine are present and are very severe, such as a heart attack or kidney failure.

mayoclinic.org - Metformin (Oral Route) Side Effects - Mayo Clinic

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Description and Brand Names

Drug information provided by: IBM Micromedex

US Brand Name

Fortamet Glucophage Glucophage XR Glumetza Riomet

Descriptions

Metformin is used to treat high blood sugar levels that are caused by a type of diabetes mellitus or sugar diabetes called type 2 diabetes. With this type of diabetes, insulin produced by the pancreas is not able to get sugar into the cells of the body where it can work properly. Using metformin alone, with a type of oral antidiabetic medicine called a sulfonylurea, or with insulin, will help to lower blood sugar when it is too high and help restore the way you use food to make energy. Many people can control type 2 diabetes with diet and exercise. Following a specially planned diet and exercise will always be important when you have diabetes, even when you are taking medicines. To work properly, the amount of metformin you take must be balanced against the amount and type of food you eat and the amount of exercise you do. If you change your diet or exercise, you will want to test your blood sugar to find out if it is too low. Your doctor will teach you what to do if this happens. Metformin does not help patients who have insulin-dependent or type 1 diabetes because they cannot produce insulin from their pancreas gland. Their blood glucose is best controlled by insulin injections.

This medicine is available only with your doctor's prescription.

This product is available in the following dosage forms:

Tablet, Extended Release

Suspension, Extended Release

Tablet

Solution

Tablet, Extended Release, 24 HR

Before Using

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:

Allergies

Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.

Pediatric

Appropriate studies performed to date have not demonstrated pediatric-specific problems that would limit the usefulness of metformin oral solution, extended-release oral suspension, and tablets in children 10 to 16 years of age. However, safety and efficacy of metformin extended-release tablets in the pediatric population have not been established.

Geriatric

Although appropriate studies on the relationship of age to the effects of metformin have not been performed in the geriatric population, geriatric-specific problems are not expected to limit the usefulness of metformin in the elderly. However, elderly patients are more likely to have age-related kidney problems, which may require caution in patients receiving metformin. This medicine is not recommended in patients 80 years of age and older who have kidney problems.

Breastfeeding

There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.

Drug Interactions

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive. Using this medicine with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.

Acetrizoic Acid

Diatrizoate

Ethiodized Oil

Iobenzamic Acid

Iobitridol

Iocarmic Acid

Iocetamic Acid

Iodamide

Iodipamide

Iodixanol

Iodohippuric Acid

Iodopyracet

Iodoxamic Acid

Ioglicic Acid

Ioglycamic Acid

Iohexol

Iomeprol

Iopamidol

Iopanoic Acid

Iopentol

Iophendylate

Iopromide

Iopronic Acid

Ioseric Acid

Iosimide

Iotasul

Iothalamate

Iotrolan

Iotroxic Acid

Ioxaglate

Ioxitalamic Acid

Ipodate

Metrizamide

Metrizoic Acid

Tyropanoate Sodium

Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

Aspirin

Balofloxacin

Besifloxacin

Bupropion

Capmatinib

Chloroquine

Ciprofloxacin

Dasabuvir

Dofetilide

Dolutegravir

Enoxacin

Fexinidazole

Fleroxacin

Flumequine

Gatifloxacin

Gemifloxacin

Hydroxychloroquine

Ioversol

Lanreotide

Levofloxacin

Levoketoconazole

Lomefloxacin

Moxifloxacin

Nadifloxacin

Norfloxacin

Octreotide

Ofloxacin

Ombitasvir

Paritaprevir

Pasireotide

Pazufloxacin

Pefloxacin

Pioglitazone

Prulifloxacin

Rufloxacin

Sitagliptin

Sparfloxacin

Tafenoquine

Thioctic Acid

Tosufloxacin

Vandetanib

Venlafaxine

Using this medicine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

Acebutolol

Atenolol

Betaxolol

Bisoprolol

Bitter Melon

Carteolol

Carvedilol

Celiprolol

Colesevelam

Esmolol

Fenugreek

Furazolidone

Glucomannan

Guar Gum

Iproniazid

Isocarboxazid

Labetalol

Levobunolol

Linezolid

Methylene Blue

Metipranolol

Metoprolol

Moclobemide

Nadolol

Nebivolol

Nialamide

Oxprenolol

Patiromer

Penbutolol

Phenelzine

Practolol

Procarbazine

Propranolol

Psyllium

Ranolazine

Rasagiline

Rifampin

Safinamide

Selegiline

Sotalol

Timolol

Tranylcypromine

Verapamil

Other Interactions

Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Alcohol, excessive use or

Underactive adrenal glands or

Underactive pituitary gland or

Undernourished condition or

Weakened physical condition or

Any other condition that causes low blood sugar—Patients with these conditions may be more likely to develop low blood sugar while taking metformin.

Anemia (low levels of red blood cells) or

Vitamin B12 deficiency—Use with caution. May make these conditions worse.

Congestive heart failure, acute or unstable or

Dehydration or

Heart attack, acute or

Hypoxemia (decreased oxygen in the blood) or

Kidney disease or

Liver disease or

Sepsis (blood poisoning) or

Shock (low blood pressure, blood circulation is poor)—A rare condition called lactic acidosis can occur. Talk with your doctor if you have concerns about this.

Diabetic ketoacidosis (ketones in the blood) or

Kidney disease, severe or

Metabolic acidosis (extra acids in the blood) or

Type 1 diabetes—Should not be used in patients with these conditions.

Fever or

Infection or

Surgery or

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Trauma—These conditions may cause temporary problems with blood sugar control and your doctor may want to treat you with insulin.

Proper Use

This medicine usually comes with a patient information insert. Read the information carefully and make sure you understand it before taking this medicine. If you have any questions, ask your doctor. Carefully follow the special meal plan your doctor gave you. This is a very important part of controlling your condition, and is necessary if the medicine is to work properly. Also, exercise regularly and test for sugar in your blood or urine as directed. Metformin should be taken with meals to help reduce stomach or bowel side effects that may occur during the first few weeks of treatment. Swallow the tablet or extended-release tablet whole with a full glass of water. Do not crush, break, or chew it. While taking the extended-release tablet, part of the tablet may pass into your stool after your body has absorbed the medicine. This is normal and nothing to worry about. Measure the oral liquid with a marked measuring spoon, oral syringe, or medicine cup. The average household teaspoon may not hold the right amount of liquid. Use the supplied dosing cup to measure the mixed extended-release oral suspension. Ask your pharmacist for a dosing cup if you do not have one. Use only the brand of this medicine that your doctor prescribed. Different brands may not work the same way. You may notice improvement in your blood glucose control in 1 to 2 weeks, but the full effect of blood glucose control may take up to 2 to 3 months. Ask your doctor if you have any questions about this.

Dosing

The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so. The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine. For type 2 diabetes: For oral dosage form (extended-release tablets): Adults— Metformin alone (Fortamet®): At first, 1000 milligrams (mg) once a day taken with the evening meal. Your doctor may increase your dose if needed until your blood sugar is controlled. However, the dose is usually not more than 2500 mg per day. Metformin alone (Glucophage® XR): At first, 500 mg once daily with the evening meal. Your doctor may increase your dose if needed until your blood sugar is controlled. However, the dose is usually not more than 2000 mg per day. Metformin alone (Glumetza®): At first, 500 mg once a day taken with the evening meal. Then, your doctor may increase your dose if needed until your blood sugar is controlled. However, the dose is usually not more than 2000 mg per day. Metformin with a sulfonylurea: Your doctor will determine the dose of each medicine. Metformin with insulin: At first, 500 mg once a day. Then, your doctor may increase your dose by 500 mg every week if needed until your blood sugar is controlled. However, the dose is usually not more than 2500 mg per day. Children—Use and dose must be determined by your doctor. For oral dosage form (extended-release suspension): Adults—At first, 5 milliliters (mL) once a day taken with the evening meal. Your doctor may increase your dose by 5 mL weekly if needed until your blood sugar is controlled. However, the dose is usually not more than 20 mL per day. Children 10 to 16 years of age—At first, 5 mL once a day taken with the evening meal. Your doctor may increase your dose by 5 mL weekly if needed until your blood sugar is controlled. However, the dose is usually not more than 20 mL per day. Children younger than 10 years of age—Use and dose must be determined by your doctor. For oral dosage form (solution): Adults— Metformin alone: At first, 5 milliliters (mL) two times a day, or 8.5 mL once a day with meals. Your doctor may increase your dose if needed until your blood sugar is controlled. However, the dose is usually not more than 25.5 mL per day. Metformin with a sulfonylurea: Your doctor will determine the dose of each medicine. Metformin with insulin: At first, 5 mL once a day. Your doctor may increase your dose if needed until your blood sugar is controlled. However, the dose is usually not more than 25 mL per day. Children 10 to 16 years of age—At first, 5 mL two times a day with meals. Your doctor may increase your dose if needed until your blood sugar is controlled. However, the dose is usually not more than 20 mL per day. Children younger than 10 years of age—Use and dose must be determined by your doctor. For oral dosage form (tablets): Adults— Metformin alone: At first, 500 milligrams (mg) two times a day taken with the morning and evening meals, or 850 mg a day taken with the morning meal. Your doctor may increase your dose if needed until your blood sugar is controlled. Later, your doctor may want you to take 500 or 850 mg two to three times a day with meals. However, the dose is usually not more than 2550 mg per day. Metformin with a sulfonylurea: Your doctor will determine the dose of each medicine. Metformin with insulin: At first, 500 mg a day. Your doctor may increase your dose by 500 mg every week if needed until your blood sugar is controlled. However, the dose is usually not more than 2500 mg per day. Children 10 to 16 years of age—At first, 500 mg two times a day taken with the morning and evening meals. Your doctor may increase your dose if needed until your blood sugar is controlled. However, the dose is usually not more than 2000 mg per day. Children younger than 10 years of age—Use and dose must be determined by your doctor.

Missed Dose

If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.

Storage

Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.

Keep out of the reach of children.

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Do not keep outdated medicine or medicine no longer needed.

Ask your healthcare professional how you should dispose of any medicine you do not use.

Precautions

It is very important that your doctor check your or your child's progress at regular visits, especially during the first few weeks that you take this medicine. Blood and urine tests may be needed to check for unwanted effects. This medicine may interact with the dye used for an X-ray or CT scan. Your doctor should advise you to stop taking it before you have any medical exams or diagnostic tests that might cause less urine output than usual. You may be advised to start taking the medicine again 48 hours after the exams or tests if your kidney function is tested and found to be normal. Make sure any doctor or dentist who treats you knows that you are using this medicine. You may need to stop using this medicine several days before having surgery or medical tests. It is very important to carefully follow any instructions from your health care team about: Alcohol—Drinking alcohol may cause severe low blood sugar. Discuss this with your health care team. Other medicines—Do not take other medicines unless they have been discussed with your doctor. This especially includes nonprescription medicines such as aspirin, and medicines for appetite control, asthma, colds, cough, hay fever, or sinus problems. Counseling—Other family members need to learn how to prevent side effects or help with side effects if they occur. Also, patients with diabetes may need special counseling about diabetes medicine dosing changes that might occur with lifestyle changes, such as changes in exercise or diet. Counseling on birth control and pregnancy may be needed because of the problems that can occur in pregnancy for patients with diabetes. Travel—Keep a recent prescription and your medical history with you. Be prepared for an emergency as you would normally. Make allowances for changing time zones and keep your meal times as close as possible to your usual meal times. In case of emergency—There may be a time when you need emergency help for a problem caused by your diabetes. You need to be prepared for these emergencies. It is a good idea to wear a medical identification (ID) bracelet or neck chain at all times. Also, carry an ID card in your wallet or purse that says that you have diabetes and a list of all of your medicines. Under certain conditions, too much metformin can cause lactic acidosis. The symptoms of lactic acidosis are severe and quick to appear, and usually occur when other health problems not related to the medicine are present and are very severe, such as a heart attack or kidney failure. Symptoms of lactic acidosis include abdominal or stomach discomfort, decreased appetite, diarrhea, fast or shallow breathing, a general feeling of discomfort, severe muscle pain or cramping, and unusual sleepiness, tiredness, or weakness. If symptoms of lactic acidosis occur, you should get immediate emergency medical help. This medicine may cause some premenopausal women who do not have regular monthly periods to ovulate. This can increase the chance of pregnancy. If you are a woman of childbearing potential, you should discuss birth control options with your doctor. This medicine may cause hypoglycemia (low blood sugar). This is more common when this medicine is taken together with certain medicines. Low blood sugar must be treated before it causes you to pass out (unconsciousness). People feel different symptoms of low blood sugar. It is important that you learn which symptoms you usually have so you can treat it quickly. Talk to your doctor about the best way to treat low blood sugar. Hyperglycemia (high blood sugar) may occur if you do not take enough or skip a dose of your medicine, overeat or do not follow your meal plan, have a fever or infection, or do not exercise as much as usual. High blood sugar can be very serious and must be treated right away. It is important that you learn which symptoms you have in order to treat it quickly. Talk to your doctor about the best way to treat high blood sugar. High blood sugar may occur if you do not exercise as much as usual, have a fever or infection, do not take enough or skip a dose of your diabetes medicine, or overeat or do not follow your meal plan.

Side Effects

Along with its needed effects, a medicine 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:

More common

Abdominal or stomach discomfort cough or hoarseness decreased appetite diarrhea fast or shallow breathing fever or chills general feeling of discomfort lower back or side pain muscle pain or cramping painful or difficult urination sleepiness

Less common

Anxiety blurred vision chest discomfort cold sweats coma confusion cool, pale skin depression difficult or labored breathing dizziness fast, irregular, pounding, or racing heartbeat or pulse feeling of warmth headache increased hunger increased sweating nausea nervousness nightmares redness of the face, neck, arms, and occasionally, upper chest seizures shakiness slurred speech tightness in the chest unusual tiredness or weakness

Rare

Behavior change similar to being drunk difficulty with concentrating drowsiness lack or loss of strength restless sleep unusual sleepiness Some side effects 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

Acid or sour stomach belching bloated excess air or gas in the stomach or intestines full feeling heartburn indigestion loss of appetite metallic taste in the mouth passing of gas stomachache stomach upset or pain vomiting weight loss

Less common

Abnormal stools bad, unusual, or unpleasant (after) taste change in taste difficulty with moving discoloration of the fingernails or toenails flu-like symptoms joint pain rash sneezing stuffy or runny nose swollen joints Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional. Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

mayoclinic.org - Metformin (Oral Route) Side Effects - Mayo Clinic

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