نبذة مختصرة : Background: Trichomonas vaginalisis a flagellate parasite causing vaginosis as a common sexual transmitted disease. Metronidazole is the drug of choice for this disease; but due to its side effects it is necessary to search for an alternative drug. In this study, the effect of Tanacetum parthenium on Trichomonas vaginalis was investigated. Methods: Using percolation method, hydro-alcoholic extracts of Tanacetum parthenium was prepared. The extract was dried using vacuum rotary evaporator. Different doses of the extract were added to 8 tubes containing culture medium of Trichomonas vaginalis; metronidazole was added to 1 tube. Finally, 104 Trichomonas vaginalis was added to each tube. Every 24 hours for 3 days, the tubes were seen for count and motion of the parasite under the microscope. Findings: In concentrations of 4, 5, 8 and 10 mg/ml of Tanacetum parthenium, the parasite did not grow. The effect of the extract on Trichomonas vaginalis was similar to the effect of metronidazole. Conclusion: Tanacetum parthenium has efficient effect against Trichomonas vaginalis growth in culture medium; so, this herb can be considered as alternative drug for methronidazole.
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