Increased risk of lactic acidosis w/ alcohol; NSAIDs, including selective COX II inhibitors, ACE inhibitors, AIIA & diuretics especially loop diuretics. Renal failure w/ iodinated contrast agents. Intrinsic hyperglycemic activity w/ systemic & locally given glucocorticoids, β
2 agonists, & diuretics. Decreased blood glucose levels w/ ACE inhibitors. Gemigliptin: Decreased AUC & C
max of pioglitazone. Altered pharmacokinetics & increased AUC w/ ketoconazole. Decreased exposure w/ strong CYP3A4 inducers eg, rifampicin, dexamethasone, phenytoin, carbamazepine, rifabutin & phenobarb. Decreased AUC & C
max w/ strong CYP3A4 inducer eg, rifampicin. Metformin: Decreased anticoagulant effect of phenprocoumon. Reduced hypoglycemic effect w/ levothyroxine. Reduced efficacy w/ organic cation transporters (OCT) 1 inhibitors eg, verapamil. Increased GI absorption & efficacy w/ OCT1 inducers eg, rifampicin. Increased plasma conc w/ OCT2 inhibitors eg, cimetidine, dolutegravir, ranolazine, trimethoprim, vandetanib & isavuconazole. May alter efficacy & renal elimination w/ OCT1 & OCT2 inhibitors eg, crizotinib & olaparib.