Dextromethorphan is a cough suppressant. It affects the signals in the brain that trigger cough reflex.
Guaifenesin is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.
Pseudoephedrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood vessels can cause nasal congestion (stuffy nose).
Dextromethorphan, guaifenesin, and pseudoephedrine is a combination medicine used to treat cough, stuffy nose, sinus congestion and chest congestion caused by allergies, the common cold, or the flu.
This medicine will not treat a cough that is caused by smoking, asthma, or emphysema.
Aldex GS DM, Altarussin CF, Capmist DM, Despec DM, Entre-Cough, ExeFen-DMX, Maxifed DMX, Poly-Vent DM, Robitussin Cold and Cough, Tusnel, Z-Cof 12DM
Diarrhea; dizziness; drowsiness; excitability; headache; irritability; nausea; stomach upset; trouble sleeping.
Seek medical attention right away if any of these SEVERE side effects occur while taking dextromethorphan / guaifenesin / pseudoephedrine:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); difficulty urinating; fast, slow, or irregular heartbeat; fever; hallucinations; mental or mood changes (eg, anxiety, nervousness); paleness; seizures; severe or persistent dizziness, lightheadedness, or headache; tremor.
(oral tablet, oral capsule, oral liquid, oral tablet, extended release, oral syrup, oral suspension, oral suspension, extended release)