What can I give my husband who has itchy, watery eyes, a runny nose, postnasal drip, and is constantly coughing and sneezing? He's tried the usual OTC drugs for the common cold and flu symptoms and Benadryl, but without much luck and this has been bothering him for over 2 weeks now.
Optional Information:
Male , Age: 26
Already Tried:
benadryl, robitussin, tylenol