Longest acting oral sulphonamide is: (A) Sulphadoxine, (B) Sulphadiazine, (C) Sulphacetamide, (D) Mafenide
Answer is A. Sulphadoxine is the longest acting orally absorbable drug. Mafenide is a topical drug.sulphadiazine and sulfacetamide are sho-acting oral drugsRef: KD Tripathi 6th ed .pg: 684