Dextromethorphan is used to stop the cough. Pseudoephedrine is used to dry up nasal stuffiness. Acetaminophen decreases the production of chemicals called prostaglandins. This decreases pain. Dextromethorphan suppresses the cough center in the brain.
Pseudoephedrine shrinks swollen nasal tissue and opens up passages.
Sinus drainage is increased by this. Take with or without food. Take with food if medicine causes an upset stomach. Make sure you are drinking enough liquids unless told to drink less by healthcare provider. Avoid products with caffeine.