Which action (s) is/are true of antihistamines? (select all that apply.) test bank?

The correct answers from the choices are:

a. Reduce inflammation locally

b. Antagonize H1 receptors

c. May be administered orally

d. Are systemically distributed

Antihistamines are drugs that are H1 antagonists or blockers, may be administered orally, are distributed systemically, and do not directly reduce nasal congestion.