Mucinex Side Effects

Generic name: guaifenesin

Medically reviewed by Drugs.com. Last updated on Sep 6, 2023.

Note: This document provides detailed information about Mucinex Side Effects associated with guaifenesin. Some dosage forms listed on this page may not apply specifically to the brand name Mucinex.

Applies to guaifenesin: oral liquid, oral solution, oral syrup, oral tablet, oral tablet extended release.

Precautions

If your cough has not improved after 7 days or if you have a fever, skin rash, continuing headache, or sore throat with the cough, check with your doctor. These signs may mean that you have other medical problems.

Common side effects of Mucinex

Some side effects of guaifenesin 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:

Serious side effects of Mucinex

Along with its needed effects, guaifenesin (the active ingredient contained in Mucinex) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

For healthcare professionals

Applies to guaifenesin: compounding powder, oral capsule, oral capsule extended release, oral granule, oral liquid, oral solution, oral tablet, oral tablet extended release.

General adverse events

Guaifenesin (the active ingredient contained in Mucinex) has been generally well tolerated.^[Ref]

Gastrointestinal

Gastrointestinal side effects have included stomach upset and vomiting with higher than recommended doses. Doses recommended for expectoration have rarely been associated with gastrointestinal upset.^[Ref]

Nervous system

Nervous system side effects have occasionally included dizziness and headache.^[Ref]

Dermatologic

Dermatologic side effects have included rare reports of rash.^[Ref]

Hypersensitivity

Hypersensitivity side effects have included a report of an anaphylactic reaction.^[Ref]

See also:

Frequently asked questions

• Does Mucinex help you get pregnant?
• Can you take Mucinex and Nyquil together?
• Does Mucinex help with Covid?
• Does Mucinex help with a sore throat?
• I have high blood pressure. Can I take Mucinex DM safely?
• What is the difference between Mucinex D and Mucinex DM?
• Can I take Claritin with Mucinex DM?
• Has anyone used expired Mucinex and had it worked?
• Is it OK to take Excedrin with Mucinex D?

Further information

Mucinex side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.

Medical Disclaimer