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Guaifenesin (expectorant): uses, side effects & brands
Guaifenesin is an expectorant that helps clear a chesty, productive cough. It belongs to the Respiratory / cough & cold medicine group. These ease breathing, loosen mucus or calm a cough in chest and airway conditions.
Drug type — dosing is set by your doctor
| Measure | Range |
|---|---|
| Drug class | Respiratory / cough & cold medicine |
| Type | Prescription |
| Dose | Individual — ask your doctor or pharmacist |
What it is used for
- Chesty cough with mucus
- Helping clear phlegm in colds and bronchitis
- Part of many cough combinations
Common brand names
- India: Grilinctus, Ascoril (combo)
- Worldwide: Mucinex, Robitussin
Common side effects
- Nausea or vomiting
- Dizziness
- Headache
Before taking it — precautions
- Drink plenty of water
- Not for young children without advice
- Check combination products for other medicines
When to see a doctor urgently
- Severe allergy (urgent)
- Cough with blood or high fever
- Cough lasting more than three weeks
Not a prescription — no dose shown. The right dose of guaifenesin depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.
Frequently asked questions
How does guaifenesin work?
It loosens mucus so coughing clears the chest more easily.
Is it a cough suppressant?
No — it helps you cough up mucus.
Can I take it with other cold medicines?
Check labels to avoid doubling up on ingredients.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.