Low blood sugar (hypoglycemia) is common in people with diabetes who are taking insulin or other medicines to control their diabetes.

Other than certain medicines, the following can also cause blood sugar (glucose) level to drop:

• Drinking alcohol
• Getting more activity than usual
• Intentionally or unintentionally overdosing on the medicines used to treat diabetes
• Missing meals

Even when diabetes is managed very carefully, the medicines used to treat diabetes can result in drug-induced low blood sugar. The condition may also occur when someone without diabetes takes a medicine used to treat diabetes. In rare cases, non-diabetes-related medicines can cause low blood sugar.

Medicines that can cause drug-induced low blood sugar include:

• Beta-blockers (such as atenolol, or propranolol overdose)
• Cibenzoline and quinidine (heart arrhythmia drugs)
• Glinides (such as nateglinide and repaglinide)
  
• Indomethacin (a pain reliever)
• Insulin
• Metformin when used with sulfonylureas
• SGLT2 inhibitors (such as canagliflozin, dapagliflozin, empagliflozin and ertugliflozin) with or without sulfonylureas
• Sulfonylureas (such as glipizide, glimepiride, glyburide)
• Thiazolidinediones (such as pioglitazone and rosiglitazone) when used with sulfonylureas
• Drugs that fight infections (such as gatifloxacin, levofloxacin, pentamidine, quinine, trimethoprim-sulfamethoxazole)

Hypoglycemia - drug-induced; Low blood glucose - drug-induced

Cieslak J, Levin A, Beaulieu M. Management of patients with diabetes in the intensive care unit. In: Ronco C, Bellomo R, Kellum JA, Ricci Z, eds. Critical Care Nephrology. 3rd ed. Philadelphia, PA: Elsevier; 2019:chap 215.

Holt RIG. Diabetes mellitus. In: Feather A, Randall D, Waterhouse M, eds. Kumar and Clarke's Clinical Medicine. 10th ed. Philadelphia, PA: Elsevier; 2021:chap 23.

Updated by: Frank D. Brodkey, MD, FCCM, Associate Professor, Section of Pulmonary and Critical Care Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.