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Drug interactions between metformin and Welchol

Results for the following 2 drugs:
Welchol (colesevelam)

Interactions between your selected drugs


metformin ↔ colesevelam

Applies to:metformin and Welchol (colesevelam)

Colesevelam may increase the blood levels and effects of metFORMIN. You may need a dose adjustment or closer monitoring of your blood sugar to safely use both medications. Contact your doctor if your condition changes or you experience increased side effects such as nausea, vomiting, diarrhea, flatulence, and indigestion. You should seek immediate medical attention if you develop weakness, muscle pain, chills, increasing drowsiness, abdominal pain or discomfort, slow or irregular heartbeat, breathing difficulty and other unusual symptoms, as these may be early signs of a rare but serious side effect of metFORMIN known as lactic acidosis. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Switch to professional interaction data

Drug Interaction Classification

The classifications below are a guideline only. The relevance of a particular drug interaction to a specific patient is difficult to determine using this tool alone given the large number of variables that may apply.

Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.

Do not stop taking any medications without consulting your healthcare provider.

Disclaimer: Every effort has been made to ensure that the information provided by Multum 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. Multum's 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 that the drug or combination is safe, effective, or appropriate for any given patient. Multum Information Services, Inc. does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. Copyright 2000-2016 Multum Information Services, Inc. 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 drugs you are taking, check with your doctor, nurse, or pharmacist.