The Nurse Teaching the Client About the Effects of Diphenhydramine

The nurse teaching the client about the effects of diphenhydramine (Benadryl) , an ingredient in the cough suppressant prescribed for the client, should plan to tell the client to do which of the following while taking this medication?

A) Take it on an empty stomach.
B) Avoid activities requiring mental alertness.
C) Use alcohol for additional effect in reducing cough.
D) Avoid chewing sugarless gum or using oral rinses mouth.