The antimicrobial activity of the essential oil of A. longa hasnot been reported previously, but the effectiveness of some Aris-tolochia essential oils at inhibiting microbial growth has alreadybeen reported. In this way, it has been shown that the essential oilsfrom rhizomes and aerial parts of Aristolochia mollissima exhibited antimicrobial activity against twenty one organisms being moreeffective against gram-positive bacterial strains