Mucinex

(Guaifenesin)

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3.8/ 5 average rating with 902 reviewsforMucinex

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Breaks up mucus that causes cough.

Skip Upsides & Downsides section. Skip to side effects section.

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.

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Quick facts about Mucinex

Drug class: Respiratory
Rx status: Over-the-counter
Generic status: Lower-cost generic available (guaifenesin)

Upsides

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.

Downsides

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.

Quick facts about Mucinex

Drug class: Respiratory
Rx status: Over-the-counter
Generic status: Lower-cost generic available (guaifenesin)

Used for

Expectoration (clearing) of mucus

Dosage forms

Extended release
Liquid