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Background  Serotonin reuptake inhibitors were recently reported to possess antimicrobial potentials, potentiate activity of several antibiotics, reverse multidrug resistant phenotypes of bacteria and make them susceptible to previously resistant drugs. We investigated antimicrobial potentials of sertraline (SR) against ATCC strains, clinical isolates of  Staphylococcus aureus ,  Escherichia coli  and  Pseudomonas aeruginosa  alone and in-combination with seven antibiotics. Antifungal activity was investigated against four fungal strains including  Aspergillus niger ,  Aspergillus fumigatus ,  Aspergillus flavus , and  Fusarium solani.  Intrinsic antibacterial action and Minimum Inhibitory Concentrations (MICs) were determined using well assay, nutrient broth and agar dilution techniques. Disk diffusion and nutrient broth methods were used to study bacterial susceptibility to SR. Minimum Fungicidal Concentrations (MFCs) of SR were determined using Sabouraud dextrose Agar (SDA).    Results  Sertraline possesses strong intrinsic antibacterial, antifungal activities and has augmented the antibacterial activities of antibiotics. For  S. aureus  ATCC 6538,  E. coli  ATCC 8739 and  P. aeruginosa  ATCC 9027, the MICs of SR were 20, 40 and 60 μg ml −1 , respectively, whereas 55.5% clinical isolates of  S. aureus  and 50% of  E. coli  strains were inhibited at 20 and 60 μg ml −1  of SR, respectively. Among the tested fungi, 60% of  A. niger  and  A. fumigatus  were inhibited at 40 and 80 μg ml −1 , respectively. MFCs were 60 and 80 μg ml −1  for  A. flavus  and  F. solani,  respectively .  Antibacterial activities of all antibiotics were significantly increased ( p  < 0.001) with the addition of SR 100 μg ml −1  against all tested bacteria.    Conclusion  Combination study revealed that SR had significantly increased the activity of antibiotics, and some previously resistant strains were made susceptible. Thus antidepressants are potential sources of resistance modifying agents when used in combination.

Sertraline enhances the activity of antimicrobial agents against pathogens of clinical relevance