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Medically reviewed by Fedorchenko Olga Valeryevna, PharmD. Last updated on 26.06.2023

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Top 20 medicines with the same components:
Temporarily relieves cough due to minor throat and bronchial irritation as may occur with the common cold or inhaled irritants. Calms the cough control center and relieves coughing.
* you are allergic to any ingredient in Dextromethorphan/Guaifenesin (Wal-Tussin DM)
* you have taken furazolidone or a monoamine oxidase inhibitor (MAOI) (eg, phenelzine) within the last 14 days
* you are taking a selective serotonin reuptake inhibitor (SSRI) (eg, fluoxetine)
This combination medication is used to relieve coughs caused by the common cold, bronchitis, and other breathing illnesses. Guaifenesin (Wal-Tussin DM) belongs to a class of drugs known as expectorants. It works by thinning and loosening mucus in the airways, clearing congestion, and making breathing easier. Dextromethorphan belongs to a class of drugs known as cough suppressants. It acts on a part of the brain (cough center) to reduce the urge to cough.
If you are self-treating with this medication, it is important to read the package instructions carefully before you start using this product to be sure it is right for you.
Cough-and-cold products have not been shown to be safe or effective in children younger than 6 years. This product (sustained-release) is not recommended for use in children younger than 12 years unless specifically directed by the doctor. Ask your doctor or pharmacist for more details about using your product safely.
These products do not cure or shorten the length of the common cold and may cause serious side effects. To decrease the risk for serious side effects, carefully follow all dosage directions. Do not use this product to make a child sleepy. Do not give other cough-and-cold medication that might contain the same or similar ingredients. Ask the doctor or pharmacist about other ways to relieve cough and cold symptoms (such as drinking enough fluids, using a humidifier or saline nose drops/spray).
How to use Wal-Tussin DM
Take this medication by mouth with or without food, as directed by your doctor, usually every 12 hours with a full glass of water. If you are self-treating, follow all directions on the product package. If you are uncertain about any of the information, ask your doctor or pharmacist.
Dosage is based on your age, medical condition, and response to treatment. Do not take more than 2 doses in 24 hours. Do not increase your dose or take this drug more often than directed.
Do not crush or chew this medication. Doing so can release all of the drug at once, increasing the risk of side effects. Also, do not split the tablets unless they have a score line and your doctor or pharmacist tells you to do so. Swallow the whole or split tablet without crushing or chewing.
Drink plenty of fluids while taking this medication. Fluids will help to break up mucus and clear congestion.
Improper use of this medication (abuse) may result in serious harm (such as brain damage, seizure, death). Do not increase your dose, take it more frequently, or use it for a longer time than directed.
Tell your doctor if your cough returns, or if it is accompanied by fever, severe sore throat, rash, persistent headache, or if it persists or worsens after 7 days. These may be signs of a serious medical problem. Seek immediate medical attention if you think you may have a serious medical problem.
Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.
Taking certain MAO inhibitors with this medication may cause a serious (possibly fatal) drug interaction. Avoid taking isocarboxazid, methylene blue, moclobemide, phenelzine, procarbazine, rasagiline, selegiline, or tranylcypromine during treatment with this medication. Most MAO inhibitors should also not be taken for two weeks before treatment with this medication. Ask your doctor when to start or stop taking this medication.
Guaifenesin (Wal-Tussin DM) and dextromethorphan are available in both prescription and nonprescription products. Check the labels of all your medications to make sure you are not taking more than one product containing Guaifenesin (Wal-Tussin DM) or dextromethorphan.
Guaifenesin (Wal-Tussin DM) can affect the results of certain lab tests (such as urine levels of certain acids). Make sure laboratory personnel and all your doctors know you use this drug.
Dizziness, drowsiness, nausea, and vomiting may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly.
If your doctor has directed you to use this medication, remember that he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.