i wouldn't recommend it. you may have taken the maximum dose for pseudoephedrine already and your advil cold and sinus most likely has another decongestant (either more pseudoephedrine or phenylephrine). either way you may end up taking more decongestants than recommended and end up with some side effects.
i took sudafed over an hour ago. it doesn't appear to be working. what would happen if i took advil cold & sinus? . i have a cold and took sudafed over an hour ago which doesn't seem to be working. the package says that you're not suppose to take more than 1 within 24 hours. would it be okay if i took an advil cold & sinus in the next couple of hours if i still feel like i do now?