Screening of antibacterial activity of different brands of co-trimoxazole paediatric suspension available in the local market

ABSTRACT

Sulfonamides are the drug of choice for number of infections like pneumonia, toxoplasmosis, nocardiosis, urinary tract infections. Sulfonamides are most commonly used in combinations such as [Trimethoprim-Sulfamethoxazole] [TMP+SMZ] or co-trimoxazole. Sixty five isolates belonging to five different species, E. coli [22], S. aureus [18], Klebsiella [05], Pseudomonas [16] and Proteus [04] were used for screening antibacterial activity against different brands [A-G] of Co-trimoxazole by disc diffusion method. Brand G exhibited highest activity against E. coli with mean zone of inhibition 41mm +/-2.3 standard deviation. The antibacterial activity against other species S. aureus, Klebsiella and Pseudomonas were found as [mean +/- standard deviation] observed as 39.73 mm +/- 10.59 mm +/- 38 mm +/- 2 and 24.93 mm +/- 5.32. However all isolates of Proteus were found resistant against different brands of co-trimoxazole