Over-the-counterLower-cost generic availableClass: Respiratory



Over-the-counterLower-cost generic availableClass: Respiratory
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Breaks up mucus that causes cough.

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Our bottom line

Mucinex (Guaifenesin) is a useful medicine for loosening congestion in your chest and throat, and it lasts longer than other guaifenesin products.


  • Mucinex (Guaifenesin) reduces the thickness and amount of mucus in your throat and chest.
  • Lasts longer than some other products that contain guaifenesin, such as Robitussin, because it's an extended-release form.
  • It’s available at the drugstore either by itself or in combination with other medications to treat cold and flu symptoms.
  • Available in liquid and tablet forms.
  • Mucinex (Guaifenesin) is alcohol- and sugar-free.
People’s experience with Mucinex

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  • Mucinex (Guaifenesin) is more expensive than other medications that treat congestion.
  • You need to drink a lot of fluids while taking this medication or it won't work as well.
  • Mucinex (Guaifenesin) isn’t useful if you have a dry cough.
  • Can cause nausea, headache, and an upset stomach.
How it works

Mucinex (Guaifenesin) is an expectorant. It contains guaifenesin, which thins and loosens mucus, making it easier to cough out.

People’s experience with Mucinex

902reviews so far. What do you think?

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Dosage forms
  • Extended release
  • Liquid
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Side effect rates for Mucinex (guaifenesin)

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These are side effects of Mucinex (guaifenesin) reported to the FDA by people taking it, and by doctors and pharmacists.
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Risks and Warnings for Mucinex (guaifenesin)

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  • Some people taking Mucinex (Guaifenesin) have reported nausea and vomiting. This is very rare and usually not serious. However, if you develop a fever with the nausea and vomiting, then talk to your doctor right away.

Common concerns from people taking Mucinex (guaifenesin)

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  • Mucinex (Guaifenesin) is alcohol- and sugar-free.