“…A total of 11 studies were included in this review, with 83438 patients on warfarin therapy who received antibiotics. Five studies were casecontrol studies [15,16,17,18,19], five were retrospective cohort studies [20,21,22,23,24], and one was a prospective study [25]. Six studies were conducted in the USA [15,16,20,21,23,24], three in Canada [17,18,19], one in Australia [22], and one in Pakistan [25].…”