alexa Evidence of significant synergism between antibiotics and the antipsychotic, antimicrobial drug flupenthixol.
Biomedical Sciences

Biomedical Sciences

Journal of Bioanalysis & Biomedicine

Author(s): Jeyaseeli L, Dasgupta A, Dastidar SG, Molnar J, Amaral L

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Abstract Previously, the antipsychotic, non-antibiotic compound flupenthixol dihydrochloride (Fp) was shown to exhibit distinct in vitro antibacterial activity against Gram-positive and Gram-negative bacteria and to significantly protect Swiss albino mice challenged with a known mouse virulent salmonella. The present study was designed to ascertain whether this drug could efficiently augment the action of an antibiotic or a non-antibiotic when tested in combination. A total of 12 bacterial strains belonging to various genera were selected for this study and were sensitive to the antibiotics penicillin (Pc), ampicillin, chloramphenicol, tetracycline, streptomycin, gentamicin, erythromycin, ciprofloxacin, and to the non-antibiotics methdilazine, triflupromazine, promethazine, and Fp. Pronounced and statistically significant synergism (p < 0.01) was observed when Fp was combined with Pc following the disc diffusion assay system. With the help of the checkerboard method, the fractional inhibitory concentration (FIC) index of this pair was found to be 0.375, confirming synergism. This pair of Fp+ Pc was then subjected to in vivo experiments in mice challenged with Salmonella enterica serovar Typhimurium NCTC 74. Statistical analysis of the mouse protection test suggested that this combination was highly synergistic (p < 0.001, Chi-squared analysis). Fp also revealed augmentation of its antimicrobial property when combined with streptomycin, gentamicin, ciprofloxacin, and the non-antibiotic methdilazine. The results of this study may provide alternatives for the therapy of problematic infections such as those associated with Salmonella spp. This article was published in Eur J Clin Microbiol Infect Dis and referenced in Journal of Bioanalysis & Biomedicine

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