Which of the following drugs competitively antagonize H1 receptors and do not cross the blood brain barrier?

Question

Quizplus · Accepted Answer

Xyzal (levocetirizine) is a second-generation antihistamine that competitively antagonizes H1 receptors and is less likely to cross the blood-brain barrier compared to first-generation antihistamines like Benadryl (diphenhydramine) and Vistaril (hydroxyzine). Mucinex is not an antihistamine.

Which of the Following Drugs Competitively Antagonize H1 Receptors and Do