Guaifenesin

Also sold as: Mucinex, Robitussin Chesty Cough

No prescription neededCough and cold

Comes as:SyrupTablet

Usual adult dose

Usual adult dose: 200 to 400 mg every 4 hours when needed (slow-release tablets 600 to 1200 mg every 12 hours). Do not take more than 2.4 g in 24 hours. Drink plenty of water.

Your doctor may give you a different dose. Children's doses depend on weight.

Side effects

Common

nausea
vomiting
stomach upset
dizziness

Serious — get help

Stop taking it and see a doctor straight away if you notice:

severe allergic reaction (swelling of face or throat
difficulty breathing)

Do not take it, or take care, if

Children under 6 years unless a doctor advises
Cough lasting more than 2 to 3 weeks, or with blood, fever or weight loss, needs a doctor

Interactions

No important interactions are listed in our database. Still tell your doctor or pharmacist everything you take.