Mucinex DM (guaifenesin / dextromethorphan) is a combination medication used for relieving chest congestion and calming a cough. It's available over-the-counter, so you don't need a prescription to get it. Most people have no side effects from it, but it cannot be used in children under 4 years old.

This combination medication is used to temporarily treat cough and runny/stuffy nose (nasal congestion) caused by infections (such as the common cold), allergies (such as hay fever), and other breathing illnesses.

Active Ingredients: In each extended-release bi-layer tablet: Dextromethorphan HBr (60 mg), guaifenesin (1200 mg). Inactive ingredients: Carbomer homopolymer type B, D&C yellow 10 aluminum lake, hypromellose USP, magnesium stearate NF, microcrystalline cellulose NF, sodium starch glycolate NF.

Ingredients. In Each Extended-Release Bi-Layer Tablet Active Ingredients: Guaifenesin (1200 mg), Expectorant. Inactive Ingredients: Carbomer Homopolymer Type B, FD&C Blue 1 Aluminum Lake, Hypromellose, USP, Magnesium Stearate, NF, Microcrystalline Cellulose, NF, Sodium Starch Glycolate, NF.

Guaifenesin is used to reduce chest congestion caused by the common cold, flu, or chronic bronchitis. Guaifenesin helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.

Mucinex DM contains an additional drug called dextromethorphan. This drug helps control your cough. It works by affecting signals in your brain that trigger your cough reflex. This lessens your coughing.

Official answer. Mucinex D is (guaifenesin and pseudoephedrine) is an expectorant/nasal decongestant combination, and Mucinex DM (guaifenesin and dextromethorphan) is an expectorant/cough suppressant combination.

Guaifenesin is used to reduce chest congestion caused by the common cold, flu, or chronic bronchitis. Guaifenesin helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.

Drug Label Information

They differ because Mucinex D also contains pseudoephedrine, a nasal decongestant,2 while Mucinex DM contains dextromethorphan, a cough suppressant.

The main ingredient in most Mucinex products is guaifenesin. Guaifenesin helps loosen and thin mucus in your airways so you cough it up easier.

Mucinex can cause mild to moderate side effects in some people. This can include digestive symptoms, dizziness, and drowsiness.

Mucinex D is (guaifenesin and pseudoephedrine) is an expectorant/nasal decongestant combination, and Mucinex DM (guaifenesin and dextromethorphan) is an expectorant/cough suppressant combination. Mucinex D and Mucinex DM both contain the expectorant guaifenesin (which is contained as a single ingredient in Mucinex).

This medication is used for the temporary relief of coughs caused by the common cold, bronchitis, and other breathing illnesses. This product is usually not used for ongoing cough from smoking or long-term breathing problems (such as chronic bronchitis, emphysema) unless directed by your doctor.