Sulfonamide Classification of Famotidine
Famotidine is not a sulfonamide antibiotic (it is an H2-receptor antagonist). [1] Famotidine contains a sulfonamide/sulfamide motif in its chemical structure. [2][1]
Clinical Implication for “Sulfa Allergy” Labels
Famotidine’s presence of a sulfonamide-like functional group means it is often listed under “sulfonamide” in chemical terms, but this does not make it a sulfonamide antibiotic. [2][1]