what mechanism of action makes benadryl work on a migraine
BRAND NAME: Benadryl, Sominex, Unisom, Nytol, and several others. DRUG CLASS AND MECHANISM: Diphenhydramine is an antihistamine used for treating allergic reactions.Histamine is released by the body during several types of allergic reactions and--to a lesser extent--during some viral infections, such as the common cold.he FDA originally approved diphenhydramine in 1946. PRESCRIBED FOR: Diphenhydramine is used for the relief of nasal and non-nasal symptoms of various allergic conditions such as seasonal allergic rhinitis (hay fever).