I have post nasal drip dripping in the back of the throat. What's a good OTC med?

Antihistamine. Start with saline to loosen thick mucus. If you have allergies, try Cetirizine or fexofenadine, which are non-sedating. If no better, consult an ent. See also: http://www. Richmondent. Com/nose-sinus/index. Php.