Pharmacokinetics ( PK ) were assessed at prespecified intervals ; OC : days 1 and 9 , canagliflozin : days 8 - 9 ( study 1 ) ; warfarin : days 6 ( period 1 ) and 1 ( period 2 ) ( study 2 ) ; and digoxin : days 5 - 7 ( periods 1 and 2 ) ( study 3 ) .