Expectorant (cough medicine that loosens phlegm)
Last reviewed July 2026
Who is this for?
Guaifenesin is a cough medicine that works by thinning and loosening mucus (phlegm/catarrh) in your airways, making it easier to cough it out.
Reduces mucus viscosity by increasing hydration of respiratory secretions, facilitating mucociliary clearance and expectoration of sputum from the lower respiratory tract.
Available Over The Counter
Get this from any pharmacy or chemist: no prescription needed.
Explore this drug
If you miss a dose, take it as soon as you remember. But if it's almost time for your next dose, skip the missed one and continue as normal. Do not double up.
Buy only trusted brands like Benylin Wet Cough, Benylin Children's Wet Cough, or Blokof Syrup from reputable pharmacies, and avoid roadside sellers or open market drugs. If your cough lasts more than 7 days, gets worse, or comes with fever and thick coloured phlegm, see a doctor as it may be an infection that needs antibiotics. Drink plenty of water while using this medicine to help it work properly.
Avoid taking it with other cough medicines at the same time, as many already contain guaifenesin and you could accidentally overdose. Alcohol can increase drowsiness and stomach upset, so limit drinking while using this drug. If you are on blood-thinning medications like warfarin, consult your doctor first.
Check your specific combination
Is it safe to take Guaifenesin with your other drugs?
Consult your doctor before using guaifenesin if you are pregnant or breastfeeding, as there is not enough evidence to confirm it is completely safe.
Store in a cool, dry place away from direct sunlight and heat. Nigerian weather can be very hot, so avoid leaving it on windowsills or in cars. Keep the bottle tightly closed and always keep out of reach of children.
For information only: not medical advice. Always talk to a doctor or pharmacist before changing your medication.
Names this drug is sold under, especially in Nigerian and West African pharmacies
Tap a brand for packaging, NAFDAC details and authenticity check
Counterfeit Drug Warning
Fake drugs are a serious problem in Nigeria. Always buy from a registered pharmacy. If the packaging looks different from what is described above, do not use it.