Multiple drug intolerance in patients with arterial hypertension: prevalence and determining factors

One of the reasons for poor medication compliance among patients is the occurrence of adverse drug reactions.

The aim of this study was to determine the prevalence of multiple drug intolerance syndrome (MDIS), defined as adverse reactions to 3 or more classes of drugs, among patients with arterial hypertension, and to assess the predisposing factors.

The study population included hospitalized patients diagnosed with arterial hypertension as well as patients undergoing chronic treatment in an outpatient hypertension clinic. The authors used a structured proprietary questionnaire, which focused on demographic and clinical data, including current or past history of adverse drug reactions.

The study population comprised 1000 patients, including 560 women. The mean (SD) age was 62.8 (14.9) years. Eighty patients (8%) suffered from MDIS. There were more women in this group, as compared with the entire study population (71% vs 55%; P = 0.01). The patients with MDIS had a longer history of hypertension (median 15 vs 10 years; P = 0.01), and were more likely to suffer from respiratory (P = 0.01), gastrointestinal (P = 0.003), rheumatoid (P <0.001), and endocrine (P = 0.01) disorders. The risk of MDIS was the highest with the concomitant use of analgesics, followed by β‑blockers, antiplatelet drugs, and antibiotics.

MDIS in patients with hypertension is common and more frequently affects women and patients with a longer known disease duration. Comorbidities increase the risk of MDIS. Its risk is strongly associated with the use of analgesics, β‑blockers, antiplatelet drugs, and antibiotics.