Guaifenesin is available in many different products, both prescription and nonprescription, and several different forms, including tablets, capsules, and syrup. The drug is designed to thin mucus and other secretions to make coughs more productive. Although most people have no problems with it, side effects are possible, such as drowsiness and nausea. In addition, some people should avoid this medication, such as those with chronic bronchitis.

What Is Guaifenesin?

Guaifenesin is an expectorant medication used as an active ingredient in many different nonprescription medications, such as Mucinex® or Robitussin®, and a few prescription medications. It is approved to help loosen phlegm and thin the mucus. This makes coughing more productive and helps to relieve chest congestion.
(Click Guaifenesin Uses for more information on this topic, including possible off-label uses.)

Are There Side Effects?

Just like any medicine, guaifenesin can cause side effects. However, the medication is unlikely to cause bothersome or serious problems when used correctly. If side effects do occur, in most cases, they are minor and either require no treatment or are treated easily by you or your healthcare provider.
Possible side effects seen with this product include but are not limited to:
(Click Guaifenesin Side Effects to learn more, including potentially serious reactions you should report immediately to your healthcare provider.)
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Guaifenesin Medication Information

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