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Guaifenesin is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.
Guaifenesin is used to reduce chest congestion caused by the common cold, infections, or allergies.
You should not use this medicine if you are allergic to guaifenesin.
Use this medicine exactly as directed on the label, or as prescribed by your doctor. Do not use it in larger amounts or for longer than recommended.
Guaifenesin is commonly found as part of over-the-counter combination medications for cold and cough. Read labels or ask a doctor or pharmacist before using any other cold, or cough medicine when taking guaifenesin.
Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.
Drink extra fluids to help loosen the congestion and lubricate your throat while you are taking this medication. 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 if it is safe for you to use this medicine if you have other medical conditions, such as liver disease, kidney disease, or phenylketonuria (PKU).
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.
Use guaifenesin 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.
Do not crush, chew, break, or open a controlled-release, delayed-release, or extended-release tablet or capsule. Swallow it whole. Breaking or opening the pill may cause too much of the drug to be released at one time.
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.
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
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.
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
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 guaifenesin.
Get emergency medical help if you have signs of an allergic reaction to guaifenesin: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Common guaifenesin side effects may include:
dizziness, headache;
drowsiness;
rash; or
nausea, vomiting, stomach upset.
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.
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 guaifenesin only for the indication prescribed.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/1/2020.
Source: Drugs.com Guaifenesin (www.drugs.com/guaifenesin.html).
Applies to guaifenesin: oral liquid, oral packet, oral solution, oral syrup, oral tablet, oral tablet extended release
Along with its needed effects, guaifenesin may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Some side effects of guaifenesin may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Less common or rare
Applies to guaifenesin: compounding powder, oral capsule, oral capsule extended release, oral granule, oral liquid, oral solution, oral tablet, oral tablet extended release
Guaifenesin has been generally well tolerated.
Gastrointestinal side effects have included stomach upset and vomiting with higher than recommended doses. Doses recommended for expectoration have rarely been associated with gastrointestinal upset.
Nervous system side effects have occasionally included dizziness and headache.
Dermatologic side effects have included rare reports of rash.
Hypersensitivity side effects have included a report of an anaphylactic reaction.
Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/1/2020.
Source: Drugs.com Guaifenesin (www.drugs.com/guaifenesin.html).
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