Probable pharmacological interaction between sulfonylurea and beta-blocker in a patient with DM-II. A case report

The study presents the case of a 47-year-old woman with type 2 diabetes (T2D), hypertension and anemia, treated with metformin, glyburide, metoprolol, and iron/folic acid. A drug interaction was identified between glyburide and metoprolol, causing symptoms of hypoglycemia in the afternoon. Evaluation using Horn’s Drug Interaction Probability Scale (DIPS) suggested a probable interaction. Pharmacokinetic analysis revealed that the time at which the maximum concentrations of both drugs were reached coincided with the onset of symptoms. A new medication schedule was implemented which resolved the symptoms. The drug interaction was attributed to the blockade of adrenergic effects by metoprolol, compromising the ability to counteract the action of insulin released by glybenclamide. The importance of surveillance, informed decision-making and the implementation of preventive strategies is highlighted to ensure the safety and effectiveness of pharmacological treatment in patients with specific clinical conditions, such as T2D and concomitant cardiovascular diseases.