Objectives: Adiantum capillus-veneris is one of herbs that has been used in traditional medicine of Iran and has mucolytic and antipyretic effects. Antibiotic resistancy is developing against severe bacteria,due to irrational prescription. Therefore, we assessed Adiantum capillus-veneris effects as a medicinal herb on three common bacteria. Methods: Ethanolic extract of Adiantum capillus-veneris was prepared by a pharmacology company with perculation method and was diluted in distilled water to 1/2,1/4 and 1/8 concentration.blank discs were placed in extracts for one day.Then ,the bacteria were cultured in muller hinton agar plate and the discs were placed on them.We used Gentamicine disc as control.After incubation in 37° for 24 hour, the diameter of no growth hallo around the discs were read. Results: The ethanolic extract of Adiantum capillus-veneris herb has no antimicrobial effects on the bacteria. Conclusion: Results of this study suggested that ethanolic extract of Adiantum capillus-veneris has no antimicrobial effects on this three bacteria mentioned above.Because this herb has been used in traditional medicine, we suggest more studies about it
