Riomet Side Effects

Generic Name: metformin

Note: This page contains side effects data for the generic drug metformin. It is possible that some of the dosage forms included below may not apply to the brand name Riomet.

It is possible that some side effects of Riomet may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.

For the Consumer

Applies to metformin: oral solution, oral tablet, oral tablet extended release

As well as its needed effects, metformin (the active ingredient contained in Riomet) may cause unwanted side effects that require medical attention.

If any of the following side effects occur while taking metformin, check with your doctor immediately:

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
  • shortness of breath
  • slurred speech
  • tightness in the chest
  • unusual tiredness or weakness
  • wheezing
Rare
  • Behavior change similar to being drunk
  • difficulty with concentrating
  • drowsiness
  • lack or loss of strength
  • restless sleep
  • unusual sleepiness

Some metformin side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned 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
  • runny nose
  • sneezing
  • stuffy nose
  • swollen joints

For Healthcare Professionals

Applies to metformin: compounding powder, oral solution, oral tablet, oral tablet extended release

General

Gastrointestinal 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.

Metabolic

Common (1% to 10%): Hypoglycemia
Very rare (less than 0.01%): Lactic acidosis

Gastrointestinal

Very 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

Hematologic

Very rare (less than 0.01%): Subnormal vitamin B12 levels

Other

Common (1% to 10%): Asthenia, chills, flu syndrome, accidental injury

Hepatic

Very rare (less than 0.01%): Liver function test abnormalities, hepatitis

Cardiovascular

Common (1% to 10%): Chest discomfort, flushing, palpitation

Dermatologic

Common (1% to 10%): Rash, nail disorder, increased sweating
Very rare (less than 0.01%): Erythema, pruritus, urticaria

Endocrine

Frequency not reported: Reduction in thyrotropin (TSH) levels

Immunologic

Very common (10% or more): Infection (20.5%)

Musculoskeletal

Common (1% to 10%): Myalgia

Nervous system

Common (1% to 10%): Lightheadedness, taste disturbances

Psychiatric

Common (1% to 10%): Headache

Respiratory

Common (1% to 10%): Rhinitis

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.

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