The main classification for a prototype drug, such as fexofenadine (Allegra), is a/n
1. atypical second generation H2-receptor antagonist.
2. typical first-generation H1-receptor antagonist.
3. atypical first generation H1-receptor antagonist.
4. typical second-generation H1-receptor antagonist.
Correct Answer: 4
Rationale 1: Fexofenadine (Allegra) is not an atypical H2-receptor antagonist.
Rationale 2: Fexofenadine (Allegra) is not a typical first-generation H1-receptor.
Rationale 3: Fexofenadine (Allegra) is not an atypical H1-receptor antagonist.
Rationale 4: Fexofenadine (Allegra) is a typical second-generation H1-receptor antagonist.
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