Sulphonamides are the antimicrobial compoundings containing a sulphonamides group (-SO2NH2) and are the derivatives of sulphanilamide Classification:- Chemotherapeutic agents that are contain -SO2NH3 (sulpamoyl) groups, can be placed into two groups. A) Synthetic antibacterial sulphonamides which are called as sulpha drugs. B) Non-antibacterial sulphonamides- eg. a) Diuretics - Frusemide, Clorothiazole, Hedroclorothiazole. b) Hypoglycemic agent - eg. Clorpamide, tolbutamide. 1) The synthetic antibacterial sulphonamides can be grouped as follows a) Sulphanilamide (aniline substituted) derivatives eg. Sulphadiazine, sulphaguanide. b) Prodrugs that produce sulphanilamide in viva. eg. sulphadiazine. c) Non-anilides ( non-aniline) sulphonamides. eg. Mefenide. 2) Chemical ...