So I get this head cold from my daughter, runny nose & sore throat etc. Didn't take anything before I left for work. At lunch stop by my parents house and decide to raid the medicine cabinet. So there is some Benadryl, look at the package and it lists the symtoms it relieves but does say MAY cause drowsyness. Ok fair enough, I figure since I'm blowing my nose every 2 minuites I'd take it. Well my throat is still sore and I still have snot running out my nose But now I'm a flippen zombie So I think drug manufactures need to list the facts...........................WILL CAUSE DROWSIENESS and may actually relieve a symtom or two, but probably not.