Over-the-counterLower-cost generic availableClass: Respiratory



Over-the-counterLower-cost generic availableClass: Respiratory
Back to: Full Site NavigationSkip to: side effects sectionSkip to: What to expect sectionSkip to: Risks and warnings sectionSkip to: Common concerns from users and pharmacists

Breaks up mucus that causes cough.

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

Our bottom line

Robitussin (Guaifenesin) is a useful medicine for loosening congestion in your chest and throat, but it doesn't last as long as other guaifenesin products.


  • Robitussin (Guaifenesin) reduces the thickness and amount of mucus in your throat and chest.
  • It’s available at the drugstore either by itself or in combination with other medications to treat cold and flu symptoms.
  • Available in multiple forms.
  • Can be used in children 12 years and older.
Tried Robitussin? Write a review!
Worth itNot sureNot worth it


  • Robitussin (Guaifenesin) doesn't last as long as other products that contain guaifenesin. Mucinex's extended release form lasts 12 hours and Robitussin (Guaifenesin)'s lasts 8 hours.
  • You need to drink a lot of fluids while taking this medication or it won't work as well.
  • Robitussin (Guaifenesin) isn’t useful if you have a dry cough.
  • Can cause nausea, headache, and an upset stomach.
How it works

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

Tried Robitussin? Write a review!
Worth itNot sureNot worth it
Dosage forms
  • Liquid
Skip side effects section. Skip to What to Expect and Pharmacists Tips section.

Side effect rates for Robitussin (guaifenesin)

0 reports
These are side effects of Robitussin (guaifenesin) reported to the FDA by people taking it, and by doctors and pharmacists.
Filter group. All currently selected
Filter group. All currently selected

Risks and Warnings for Robitussin (guaifenesin)

Skip risks section. Skip to common concerns section.
  • Some people taking Robitussin (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 Robitussin (guaifenesin)

Final section. Do you want to return to drug navigation?