Gemigliptin: Decreased C
max of metformin (2,000 mg). Decreased AUC & C
max of pioglitazone. Decreased exposure w/ other strong CYP3A4 inducers eg, rifampicin (rifampin), dexamethasone, phenytoin, carbamazepine, rifabutin & phenobarb. Increased AUC w/ ketoconazole. Decreased AUC & C
max w/ rifampicin. Metformin: Potentiated hypoglycemic effect w/ insulin, sulfonylamides, sulfonylureas, α-glucosidase inhibitors, anabolic steroid, guanethidine, salicylates (aspirin), β-blockers (propranolol), MAOIs, angiotensin receptor antagonists; hyperglycemic effect w/ epinephrine, sympathomimetics, corticosteroids, thyroid hormones, follicle hormone, estrogen, OCs, thiazides & other diuretics, pyrazinamide, INH, nicotinic acid, phenothiazines, phenytoin, Ca channel blocking drugs. Increased risk of accumulation & lactic acidosis w/ intake of alcohol or medicinal products that contain alcohol. May lead to renal failure w/ iodinated contrast agents. Increased plasma & blood C
max & AUC w/ furosemide. Increased plasma C
max & AUC & amount excreted in urine w/ nifedipine. May reduce effect w/ OCT1 inhibitors (verapamil, etc). May increase GI uptake & effect w/ OCT1 inducers (rifampicin, etc). May reduce renal excretion w/ OCT2 inhibitors (cimetidine, dolutegravir, lanolazine, trimethoprim, vandetanib, isavuconazole). May affect renal excretion & effect w/ OCT2 & OCT1 co-inhibitors (crizotinib, olaparib, etc). Increased risk of lactic acidosis w/ NSAIDs, ACE inhibitors, AIIA, diuretics (especially loop diuretics, etc).