How can I stop having a blocked nose when I wake up in the morning?

Mucinex (guaifenesin) Mjcinex is an over the counter product that can be very helpful to control postnasal drip or chronic sinus inflammation. Try the Mucinex (guaifenesin) without the dm, which causes headaches in susceptible indivuuals.
Dustmite pillowcase. A dust mite or plastic pillowcase may decrease your exposure to a this very common allergen, dust mites.