cough and nasal congestion
"Yeah. If you want a good decongestant, Mucinex D is for you.

Took my first dose at 4 PM, warned that it could cause "sleeplessness". Thought I was in the clear, but LOW AND BEHOLD I am hear writing this review to the world after that one dose. Current time: 7:15 AM. Taking another just to keep me up for class today. Hurray."