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Riomet Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Riomet (metformin hcl) is used with a proper diet and exercise program and possibly with other medications to control high blood sugar. It is used in patients with type 2 diabetes (non-insulin-dependent diabetes). It is not for treating type 1 diabetes. It is an oral diabetes medicine. This medication is available in generic form. Common side effects include nausea, vomiting, stomach upset, diarrhea, weakness, or a metallic taste in the mouth.
Dosage of Riomet is individualized on the basis of effectiveness and tolerance. The maximum recommended daily dose is 2550 mg (25.5 mL) in adults and 2000 mg (20 mL) in pediatric patients (10-16 years of age). Hyperglycemia (high blood sugar) may result if Riomet is taken with drugs that raise blood sugar, such as: isoniazid, diuretics (water pills), steroids, phenothiazines, thyroid medicines, birth control pills and other hormones, seizure medicines, diet pills, or medicines to treat asthma, colds or allergies. Hypoglycemia (low blood sugar) may result if Riomet is taken with drugs that lower blood sugar, such as: nonsteroidal anti-inflammatory drugs (NSAIDs), aspirin or other salicylates, sulfa drugs, monoamine oxidase inhibitors (MAOIs), beta-blockers, or probenecid. Riomet may also interact with furosemide, nifedipine, cimetidine, ranitidine, amiloride, triamterene, digoxin, morphine, procainamide, quinidine, trimethoprim, or vancomycin. Tell your doctor all medications and supplements you use. During pregnancy, Riomet should be used only when prescribed. Your doctor may prescribe insulin instead during your pregnancy. Riomet can promote ovulation and increase the risk of becoming pregnant. Consult your doctor about birth control while using this medication. This drug passes into breast milk in small amounts. Consult your doctor before breastfeeding.
Our Riomet (metformin hcl) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
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.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Riomet in Detail - Patient Information: Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
This medication may cause lactic acidosis (a build-up of lactic acid in the body, which can be fatal). Lactic acidosis can start slowly and get worse over time. Get emergency medical help if you have even mild symptoms of lactic acidosis, such as:
- muscle pain or weakness;
- numb or cold feeling in your arms and legs;
- trouble breathing;
- feeling dizzy, light-headed, tired, or very weak;
- stomach pain, nausea with vomiting; or
- slow or uneven heart rate.
Call your doctor at once if you have any other serious side effect such as:
- feeling short of breath, even with mild exertion;
- swelling or rapid weight gain; or
- fever, chills, body aches, flu symptoms.
Less serious side effects may include:
- headache or muscle pain;
- weakness; or
- mild nausea, vomiting, diarrhea, gas, stomach pain.
Read the entire detailed patient monograph for Riomet (Metformin Hcl) »
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Riomet Overview - Patient Information: Side Effects
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Metformin does not usually cause low blood sugar (hypoglycemia). Low blood sugar may occur if this drug is prescribed with other anti-diabetic medications. Talk with your doctor or pharmacist about whether the dose of your other diabetic medication(s) needs to be lowered.
Symptoms of low blood sugar include sudden sweating, shaking, fast heartbeat, hunger, blurred vision, dizziness, or tingling hands/feet. It is a good habit to carry glucose tablets or gel to treat low blood sugar. If you don't have these reliable forms of glucose, rapidly raise your blood sugar by eating a quick source of sugar such as table sugar, honey, or candy, or drink fruit juice or non-diet soda. Tell your doctor about the reaction immediately. Low blood sugar is more likely if you drink large amounts of alcohol, do unusually heavy exercise, or do not consume enough calories from food. To help prevent low blood sugar, eat meals on a regular schedule, and do not skip meals. Check with your doctor or pharmacist to find out what you should do if you miss a meal.
Symptoms of high blood sugar (hyperglycemia) include thirst, increased urination, confusion, drowsiness, flushing, rapid breathing, and fruity breath odor. If these symptoms occur, tell your doctor immediately. Your doctor may need to adjust your diabetes medication(s).
Stop taking this medication and tell your doctor right away if this very serious side effect occurs: lactic acidosis (see Warning section).
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any of the following symptoms of a serious allergic reaction: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Riomet (Metformin Hcl)»
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Riomet FDA Prescribing Information: Side Effects
Clinical Studies Experience
In a U.S. double-blind clinical study of metformin in patients with type 2 diabetes, a total of 141 patients received metformin therapy (up to 2550 mg per day) and 145 patients received placebo. Adverse reactions reported in greater than 5% of the metformin patients, and that were more common in metformin- than placebo-treated patients, are listed in Table 1.
Table 1: Most Common Adverse Reactions ( > 5.0
Percent) in a Placebo-Controlled Clinical Study of Metformin Monotherapy*
|Adverse Reaction||Metformin Monotherapy
(n = 141)
(n = 145)
|% of patients|
|*-Reactions that were more common in metformin-than placebo-treated patients.|
Diarrhea led to discontinuation of study medication in 6% of patients treated with metformin. Additionally, the following adverse reactions were reported in ≥ 1.0 to ≤ 5.0% of metformin patients and were more commonly reported with metformin than placebo: abnormal stools, hypoglycemia, myalgia, lightheaded, dyspnea, nail disorder, rash, sweating increased, taste disorder, chest discomfort, chills, flu syndrome, flushing, palpitation.
In clinical trials with metformin in pediatric patients with type 2 diabetes, the profile of adverse reactions was similar to that observed in adults.
Read the entire FDA prescribing information for Riomet (Metformin Hcl) »
Additional Riomet Information
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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