Glipizide Interactions

Berberine has potent glucose-lowering activity comparable to metformin and also inhibits CYP2C9, the enzyme responsible for clearing glipizide. The pharmacodynamic stacking plus pharmacokinetic interaction can substantially raise glipizide exposure and produce severe, prolonged hypoglycemia.

Bitter melon (Momordica charantia) has multiple glucose-lowering mechanisms including enhanced peripheral glucose uptake and possible insulinotropic activity. Combined with the sulfonylurea glipizide, the pharmacodynamic synergism can produce significant additive hypoglycemia, particularly postprandially.

Alcohol potentiates the hypoglycemic effect of glipizide by suppressing hepatic gluconeogenesis, and in rare cases can trigger a disulfiram-like reaction with flushing, headache, nausea, and palpitations. Sulfonylurea-induced hypoglycemia tends to be prolonged and recurrent.

Ginseng (Panax and American) stimulates pancreatic insulin secretion through the same mechanism as glipizide. The combination is pharmacodynamically synergistic and can cause additive hypoglycemia, particularly in fasting or fed states where ginseng has demonstrated postprandial glucose reductions.