Analysis:1

. Chlorpheniramine maleate is a histamine

Hi receptor antagonist of the propylamine class and is mainly used for allergic rhinitis, skin mucous membrane sensitization, and drug- or food-induced allergic diseases

.2

. The question is outside the scope of the medicinal chemistry syllabus here; metronidazole is not required in the syllabus

.3

. Captopril is an angiotensin converting enzyme inhibitor used to treat hypertension and congestive heart failure

.4

. The question here is outside the scope of the medicinal chemistry syllabus, which does not require cimetidine

.5

. Cyclophosphamide is a heterocyclic nitrogen mustard alkylating agent broad-spectrum antitumor agent