Piper betle L is a well known plant used in taditional medicine, espesially used as an antibactteria. The aim ot this research is to compare antibacterial activity and mechanism of inhibition between esential oil etanol 70% extract of betle leaves on some gram (+) becteria. The experimental result showed that MC values for essential oil against Staphylococcus aureus is 7,4% (b/v), Bacillus pumi…