on???Only in the analysis including warfarin users and concomitant use of an anti-infectiveAppendix 2Table 5Association between drugs of interest (versus no exposure) and hospitalization for gastrointestinal bleeding in patients receiving warfarin in case-control study; excluding patients with a prior GI bleedDrugs of interestFully adjusted OR (95% CI) 0 to 5 daysFully adjusted OR (95% CI) 6 to 10