Generic Name: guaifenesin (gwye FEN e sin)
Brand Name: Mucinex, Robitussin Mucus + Chest Congestion, Triaminic Chest Congestion, Tussin Expectorant, Xpect, ...show all 129 brand namesG Bid, Touro EX, Pneumomist, Organidin NR, Ganidin NR, Iofen-NF, Humibid Pediatric, Organ-I NR, Iodrol NR, Bidex, Guaibid-LA, Aquamist, Q-Bid LA, Amibid LA, Mucobid-L.A., Guaifenex LA, Respa-GF, Fenex-LA, Fenesin, Muco-Fen LA, Liquibid, Muco-Fen 800, Hytuss, Robitussin, Scot-Tussin Expectorant Cough, Breonesin, GuaiFENesin LA, Humavent LA, Guiacough, Guiatuss, Lotussin, GG 200 NR, Glytuss, Altarussin, Anti-Tuss, Diabetic Expectorant, Genatuss, Guaiatussin, Halotussin, Mastussin, Mytussin, Q-Tussin, Ri-Tussin, Robafen, Robichem, Scot-Tussin, Siltussin DAS, Siltussin, T-Tussin, Tusscidin, Tussin, Gua-SR, Humigen LA, Sinumist, Sorbutuss, Altorant, Duratuss G, Diabetic Tuss, Naldecon-EX Senior, Phanasin, Guaifenex G, Iophen NR, GG-Cen, Muco-Fen 1200, Liquidbid LA, Liquidbid 1200, Balminil Expect Edulcore Au Sucrose, Benylin E, Benylin E Extra Strength, Calmylin Expectorant, Guiadrine G-1200, Allfen, Siltussin SA, Iofen, Muco-Fen, Drituss G, Benylin Chesty Coughs, Robitussin Chesty Cough, Beechams Veno's for Kids Chesty Cough, Junior Meltus Colour and Sugar Free Expectorant (obsolete), Benylin Children's Chesty Coughs, Tixylix Chesty Cough, Bidex-400, Humibid e, Hill's Balsam Chesty Cough, Jackson's Extra Strength All Fours, Lloydspharmacy Expectorant Junior Cough, Junior Meltus Chesty Coughs with Catarrh (obsolete), Liqufruta Garlic Cough Medicine, Family Meltus Chesty Coughs, Jackson's The Original All Fours, Lloydspharmacy Expectorant Adult Cough, Beechams Veno's Expectorant, MucusRelief, Lemsip Cough Chesty, Nirolex Chesty Cough, Dristan Chesty Cough, Robitussin EX Paediatric Drops, Robitussin EX Colour Free, Actifed CC Chesty Cough, Nyal Chesty Cough, Robitussin-EX, Strepsils Chesty Cough, Kenkay Chesty Cough Eexpectorant, Pharmacist Expectorant, Benadryl Chesty Forte (obsolete), Vicks Formula 44 for Chesty Coughs, Vicks Cough Syrup for Chesty Coughs, Dristan Chesty Cough Guaiphenesin, Benylin E Extra Strength with Menthactin, Mucinex Childrens, Mucinex Childrens Mini-Melts, Mucinex Junior Strength Mini-Melts, Humibid, Mucinex Max Strength, GuaiFENesin NR, Siltussin DAS-NA, Buckley's Chest Congestion, Fenesin IR, Robitussin Chest Congestion, Mucinex Kids' Mini-Melts, Liquituss GG, Tussin Mucus + Chest Congestion, Geri-Tussin Expectorant
Medically reviewed on December 14, 2016.
What is guaifenesin?
Guaifenesin is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.
Guaifenesin may also be used for purposes not listed in this medication guide.
Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.
Before taking this medicine
You should not use this medicine if you are allergic to guaifenesin.
Ask a doctor or pharmacist if it is safe for you to use this medicine if you have other medical conditions.
It is not known whether guaifenesin will harm an unborn baby. Ask a doctor before using this medicine if you are pregnant.
It is not known whether guaifenesin passes into breast milk or if it could harm a nursing baby. Ask a doctor before using this medicine if you are breast-feeding a baby.
Do not give this medicine to a child without medical advice.
How should I take guaifenesin?
Use exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended. Cough medicine is usually taken only for a short time until your symptoms clear up.
Take guaifenesin with food if it upsets your stomach.
Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.
Drink extra fluids to help loosen the congestion and lubricate your throat while you are taking this medication.
Store at room temperature away from moisture, heat, and light.
What happens if I miss a dose?
Since cough or cold medicine is taken when needed, you may not be on a dosing schedule. If you are taking the medication regularly, take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking guaifenesin?
This medication may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.
Ask a doctor or pharmacist before using any other cold, or cough medicine. Many combination medicines contain guaifenesin. Taking certain products together can cause you to get too much of a certain drug. Check the label to see if a medicine contains an expectorant.
Guaifenesin side effects
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Common side effects may include:
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
Guaifenesin dosing information
Usual Adult Dose for Cough:
Immediate release formulation: 200 to 400 mg orally every 4 hours as needed, not to exceed 2.4 g/day
Sustained release formulation: 600 to 1200 mg orally every 12 hours, not to exceed 2.4 g/day
Usual Pediatric Dose for Cough:
Immediate release formulation:
less than 2 years: 12 mg/kg/day orally in 6 divided doses
2 to 5 years: 50 to 100 mg orally every 4 hours as needed, not to exceed 600 mg/day
6 to 11 years: 100 to 200 mg orally every 4 hours as needed, not to exceed 1.2 g/day
12 years or older: 200 to 400 mg orally every 4 hours as needed, not to exceed 2.4 g/day
Sustained release formulation:
2 to 5 years: 300 mg orally every 12 hours, not to exceed 600 mg/day
6 to 11 years: 600 mg orally every 12 hours, not to exceed 1.2 g/day
12 years or older: 600 to 1200 mg orally every 12 hours, not to exceed 2.4 g/day
What other drugs will affect guaifenesin ?
Other drugs may interact with guaifenesin, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Copyright 1996-2018 Cerner Multum, Inc. Version: 6.03.
More about guaifenesin
- Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Images
- Support Group
- Pricing & Coupons
- 187 Reviews – Add your own review/rating
- Drug class: expectorants
- Guaifenesin Extended-Release Tablets
- Guaifenesin Granules
- Guaifenesin Tablets
- Guaifenesin Liquid
- Guaifenesin (Advanced Reading)