Why does my urine smells like chemicals after taking cold medicine?

I know the answer: Guaifenesin! It's an expectorant in cough and cold medicine, like Mucinex and Dayquil (Nyquil does not have it). Guaifenesin also has a tendency to make your urine smell funny, but that's perfectly normal and will go away once it leaves your system. I've taken medicine with the stuff before, so I know this through experience.