Which of the following antihistamines are considered to be second-generation histamine1 (H1) antagonists?
a. Azelastine
b. Fexofenadine
c. Loratidine
d. Alkylamines
e. Ethanolamines
f. Clemastine
ANS: A, B, C
Of the choices, the second-generation H1 antagonists are azelastine, fexofenadine, and loratidine. Clemastine, ethanolamines, and alkylamines are first-generation H1 antagonists.
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