Question

Which one of the following is a Histamine H1-receptor antagonist?

• A. \( \text{4-(5H-dibenzola,d] cyclohepten-5-ylidene)-1-methyl pyridine hydrochloride} \)
• B. \( \text{4-(5H-dibenzola,d] cyclohepten-5-ylidene)-1-methyl pyrimidine hydrochloride} \)
• C. \( \text{4-(5H-dibenzo[a,d] cyclohepten-5-ylidene)-1-methyl piperidine hydrochloride} \)
• D. \( \text{4-(5H-dibenzoja,d] cycloheptane-5-ylidene)-1-methyl piperidine hydrochloride} \)

Hint:

H1-receptor antagonists help manage allergy symptoms by preventing histamine binding to target cells.

Answer 1

The Correct Option is C

Histamine H1-receptor antagonists block histamine-mediated allergic reactions, reducing inflammation and hypersensitivity. The correct answer corresponds to classic antihistamines used for allergy relief and motion sickness prevention. These compounds modulate immune responses by inhibiting histamine action.