A rapid and specific proton magnetic resonance spectroscopic method was dev
eloped for determining acetazolamide in tablets. Maleic acid was used as th
e internal standard and DMSO-d(6) served as the NMR solvent. The concentrat
ion of drug per unit dose was calculated from the integration values for th
e resonance signals of acetazolamide at 2.14 ppm and maleic acid at 6.20 pp
m. The method using commercial products gave comparable results of those ob
tained by the method of USP XXIII.