# Guaifenesin in Nigeria

- Source: https://ogbogwu.com/drugs/guaifenesin/
- Drug class: Expectorant (Cough, Cold & Flu)
- Also known as: Guaiphenesin, Benylin Chesty Cough, Robitussin
- Prescription required: no
- Last updated: September 2026

## Price in Nigeria

As of September 2026, Guaifenesin syrup sells for about ₦147 per ml online in Nigeria (packs ₦14,700–₦43,600) across MedPlus and NettPharmacy and Supermart.ng. The online price is up 6% since July 2026. Open-market prices (e.g. Idumota, Ogbogwu) are often lower.

## What is Guaifenesin?

Guaifenesin is an expectorant — a medicine that helps clear a chesty, mucus-filled cough. It is one of the most common active ingredients in the cough syrups sold across Nigerian pharmacies and patent medicine stores, appearing both on its own and blended into combination cold-and-cough products. Well-known brands containing guaifenesin include Benylin Chesty Cough and Robitussin, alongside many affordable local generics.

Guaifenesin works by thinning and loosening the thick mucus (phlegm) in the airways, so that coughing brings it up more easily and the chest feels less congested. Importantly, it does not stop you coughing — it makes your cough more useful. That is why it suits a 'chesty' or 'productive' cough where you can feel mucus on the chest, and is the wrong choice for a dry, tickly cough with no phlegm, for which a cough suppressant like dextromethorphan is more appropriate.

Guaifenesin is available without a prescription and is generally very safe when taken at the recommended dose. Drinking plenty of water alongside it helps it work, because good hydration also keeps mucus loose. Most coughs from a common cold clear on their own within one to two weeks; guaifenesin eases the symptoms while that happens. Genuine cough syrups in Nigeria should carry a NAFDAC registration number — worth checking, as cough preparations are a common target for fakes.

## What is Guaifenesin used for?

- Relieving a chesty (productive) cough by loosening mucus in the airways
- Easing chest congestion during a cold or mild chest infection
- Helping clear phlegm so the airways feel less blocked
- Symptom relief as part of combination cough-and-cold remedies
- Supportive treatment alongside rest and fluids for common colds

## Dosage

Always follow a doctor's or pharmacist's instructions; this is general reference information.

- Adults: For a typical 100mg/5ml syrup, the usual adult dose is 10ml (200mg) three to four times a day, or as directed on the pack. Do not exceed the maximum stated on the label. Drink plenty of water while taking guaifenesin, as it helps loosen mucus. Follow the specific product's instructions, since strengths and combination ingredients differ between brands.
- Children: Doses for children depend on age and the product strength — always follow the label or pharmacist's advice. Guaifenesin-containing cough syrups are generally not recommended for children under 6 years, and cough-and-cold medicines should be used cautiously in young children. Never give an adult cough syrup to a small child by guessing the dose.
- Elderly: Standard adult doses are usually suitable. Older adults with other health conditions or on several medicines should check with a pharmacist, especially when using combination products.

Guaifenesin treats the symptom, not the cause. A cough that lasts more than 2-3 weeks, or comes with high fever, breathlessness, chest pain, or coughing up blood, needs a doctor rather than more cough syrup. Read the label carefully on combination products — many contain paracetamol, antihistamines, or decongestants as well, and doubling up on these across different medicines can be harmful.

## Side effects

Common: Nausea or mild stomach upset; Vomiting, especially at higher doses; Dizziness or headache; Drowsiness (more likely with combination products that contain an antihistamine).

Serious (seek medical help immediately): Rash, itching, or swelling — possible allergic reaction; Difficulty breathing or swelling of the face, lips, or throat — seek emergency care; Persistent vomiting.

When to see a doctor: See a doctor if your cough lasts more than 2-3 weeks, keeps coming back, or is accompanied by a high fever, shortness of breath, wheezing, chest pain, or blood in the phlegm. Stop the medicine and seek help if you develop a rash, swelling, or difficulty breathing. For a persistent chesty cough in a smoker, or in anyone with known lung disease, a medical review is important rather than continued self-treatment.

## Warnings

Do not take if: Do not use if you are allergic to guaifenesin; Avoid in children under 6 years unless advised by a doctor; Use combination cough-and-cold products cautiously if you have high blood pressure, heart disease, or an enlarged prostate (because of added decongestants); Do not use to suppress a productive cough that is clearing a chest infection without medical advice.

Interactions: Combination cough-and-cold syrups may contain paracetamol — avoid taking additional paracetamol-containing medicines at the same time to prevent overdose; Products that also contain sedating antihistamines can add to the drowsiness caused by alcohol or other sedatives; Added decongestants (in some combinations) can interact with blood pressure medicines and certain antidepressants; Guaifenesin on its own has few significant drug interactions.

Pregnancy & breastfeeding: There is limited safety data on guaifenesin in pregnancy, particularly in the first trimester, so it is best avoided in early pregnancy and used later only if clearly needed and after speaking to a doctor or pharmacist. Non-drug measures such as steam inhalation, honey and warm fluids, and rest are safer first steps for a cough in pregnancy. Small amounts may pass into breast milk; check with a pharmacist before use while breastfeeding, and prefer single-ingredient products over combinations.

## Brands in Nigeria

Well-known NAFDAC-registered brands: Benylin Chesty Cough (Kenvue, made in United Kingdom); Robitussin Chesty Cough (Haleon, made in United Kingdom); Shaltoux (Shalina Healthcare Nigeria Limited, made in India).
Full searchable brand list: https://ogbogwu.com/drugs/guaifenesin/brands/

## How to verify it is genuine

1. Check the NAFDAC registration number on the pack — genuine cough syrups sold in Nigeria must carry a valid NAFDAC number
2. Verify the NAFDAC number using the NAFDAC Green Book or the NAFDAC mobile app, especially for imported brands like Benylin and Robitussin
3. Buy from licensed pharmacies and registered patent medicine stores rather than roadside hawkers, as cough syrups are commonly counterfeited
4. Check the expiry date and that the seal, cap, and carton are intact and untampered
5. Genuine syrup should be the expected colour and consistency with no unusual smell or separation; discard anything that looks or smells wrong
6. Be cautious of any cough syrup claiming to contain codeine — codeine-containing cough syrups were banned in Nigeria and are illegal to sell

Verify any NAFDAC number free (no login): https://ogbogwu.com/nafdac-checker/

## FAQs

### What is the difference between an expectorant and a cough suppressant?

They do opposite jobs, so choosing the right one matters. An expectorant like guaifenesin loosens and thins mucus so a chesty, productive cough clears more easily — it helps you cough the phlegm up. A cough suppressant like dextromethorphan calms the cough reflex and is meant for a dry, tickly cough with no mucus. Using a suppressant on a chesty cough can trap mucus on the chest, while using an expectorant on a dry cough simply will not help. If you can feel phlegm, reach for an expectorant; if the cough is dry and irritating, a suppressant is more suitable.

### Can I give guaifenesin cough syrup to my child?

Be careful. Guaifenesin-containing cough syrups and combination cough-and-cold medicines are generally not recommended for children under 6, and should be used only with a pharmacist's or doctor's guidance in older children, using a product and dose meant for their age. Never give an adult cough syrup to a small child by estimating the dose. For young children, safer first steps are plenty of fluids, warm drinks, honey (for those over 1 year), and rest — and a doctor's review if the cough is severe, persistent, or comes with fever or breathing difficulty.

### How long should I take cough syrup before seeing a doctor?

Most coughs from a common cold ease within one to two weeks, and cough syrup is only there to make you more comfortable while that happens. See a doctor if your cough lasts more than 2-3 weeks, keeps returning, or comes with a high fever, breathlessness, wheezing, chest pain, or blood in the phlegm — these can point to something more than a simple cold, such as a chest infection, asthma, or tuberculosis, which is still common in Nigeria. Do not keep buying stronger and stronger cough syrups instead of getting a persistent cough checked.

## Sources

- NAFDAC Greenbook (official register of approved products in Nigeria)
- British National Formulary (BNF)
- Nigerian Standard Treatment Guidelines (Federal Ministry of Health)