Dextromethorphan is a cough suppressant. It affects the signals in the brain that trigger cough reflex.
Diphenhydramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.
Phenylephrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood vessels can cause nasal congestion (stuffy nose).
Dextromethorphan, diphenhydramine, and phenylephrine is a combination medicine used to treat cough, runny or stuffy nose, sneezing, itching, and watery eyes caused by allergies, the common cold, or the flu.
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Dytan-DM, Triaminic Day Time Night Time Cold & Cough
Stop using this medicine and call your doctor at once if you have:
confusion, severe anxiety, hallucinations, tremors;
weak or shallow breathing;
a light-headed feeling, like you might pass out;
fast or pounding heartbeats;
painful or difficult urination, little or no urinating;
pale skin, weakness, easy bruising or bleeding, fever, chills, body aches; or
increased blood pressure--severe headache, buzzing in your ears, chest pain, shortness of breath, uneven heartbeats.
Common side effects may include:
dizziness, drowsiness, headache;
constipation, upset stomach, loss of appetite;
blurred vision, double vision, dry eyes;
sleep problems (insomnia); or
dry mouth, nose, or throat.
Usual Adult Dose for Allergic Rhinitis Dextromethorphan/diphenhydrAMINE/PE 15 mg-12.5 mg-15 mg/5 mL oral suspension, extended release: 5 to 10 mL orally every 12 hours. Dextromethorphan/diphenhydrAMINE/PE 75 mg-25 mg-7.5 mg/5 mL oral suspension, extended release: 5 to 10 mL orally every 12 hours.