Head Off Hypoglycemia

Treatment is required when the blood glucose level is below 45 gm/dL. Symptoms include anxiety, tremulousness, nausea, sweating, palpitation, and hunger.3 More severe symptoms related to compromised central nervous system function include weakness, fatigue, confusion, seizures, focal neurologic deficits, and coma.

The most common causes of drug-induced hypoglycemia are insulin, ethanol, or sulfonylureas. Risk factors associated with unintentional overdose of sulfonylureas include advanced age, drug-to-drug interactions, and decreased renal or hepatic clearance. Other drugs have been reported to cause hypoglycemia. Some of these include high-dose salicylates, beta-blockers, haloperidol, monoamine oxidase inhibitors, other sulfonamides (particularly trimethoprim-sulfamethoxazole), pentamidine, quinine/quinidine, and quinolone antibiotics (e.g., gatifloxacin or levofloxacin).4

Diabetics use more than 120 natural medicines, either alone or in combination with their prescribed diabetes medications, to lower blood glucose and/or improve HbA1c.5 Some of the most commonly used products are banaba, bitter melon, fenugreek, and Gymnema (hypoglycemics), along with American or panax ginseng, cassia cinnamon, chromium, prickly pear cactus, soy, or vanadium (insulin sensitizers).

Diagnosis

Patient history aids in the clinical diagnosis of hypoglycemia and should be reviewed to determine a potential drug-induced cause. History also might identify a medication dispensing error (e.g., the onset of hypoglycemia following a recent medication refill). Hospitalists should question the patient or the patient’s family as to medication use, including over-the-counter drugs, vitamins, supplements, natural foods, and other related products.

Treatment

Glucose should be administered to maintain a plasma glucose level of at least 50 gm/dL. This may be achieved orally via frequent meals or snacks, or intravenously. The underlying cause should be addressed. In drug- or medication-induced cases, the causative agent should be removed or retitrated to an effective dose that does not cause hypoglycemia.

Upon further questioning, the patient admitted she’d been taking 3,000 mg of a bitter melon product per day. She took this in addition to all her prescribed medications. Because bitter melon has an insulin-like effect, its use in combination with glimepiride led to the clinically significant hypoglycemic reaction, which required hospitalization and treatment. Prior to discharge, the patient promised to discuss the use of alternative and natural products with her pharmacist or physician before trying anything new. TH

Michele B. Kaufman, PharmD, BSc, RPh, is a freelance medical writer based in New York City.

References

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