Regimens were : study @ : OC ( levonorgestrel ( @ g ) + ethinyl estradiol ( @ g ) ) / day ( day @ ) , canagliflozin @ mg/day ( days @ - @ ) , and canagliflozin with OC ( day @ ) ; study @ : canagliflozin @ mg/day ( days @ - @ ) with warfarin @ mg/day ( day @ ) in period @ , and only warfarin @ mg/day ( day @ ) in period @ , or vice versa ; study @ : digoxin alone ( @ mg/day ( day @ ) + @ mg/day ( days @ - @ ) ) in period @ , and with canagliflozin @ mg/day ( days @ - @ ) in period @ , or vice versa .