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

Introduction: One of the reasons for poor medication compliance among patients is the occurrence of adverse drug reactions. Objectives: 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. Patients and methods: 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. Results: 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. Conclusions: 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.