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Background: High blood pressure (HBP) is responsible for over 7.1 million deaths annually. Drug therapy problems (DTPs) interfere with the therapeutic control of HBP. This study aimed to evaluate drug therapy problems among hypertensive patients in a secondary healthcare centre in Lagos State.
Methods: This was a retrospective study carried out in a secondary health facility in Lagos State, Nigeria from 1st January 2017 through 31st December 2018. Data were extracted from the patients' folders using the Pharmaceutical Care Network Europe (PCNE) Classification tool Version 7.0, DRP-PCNE V 7.0 and analyzed with the IBM SPSS Version 25.0.
Results: 250 patient folders were assessed. Drug therapy problems were found in 181 of the 245 folders included in the study (73.9%). The mean + SD age of patients was 58.65 + 12.35 years. The mean + SD number of drug therapy problems per patient was 3.18 1 1.17. Treatment effectiveness was the most frequently encountered category of drug therapy problems (96.6%, n = 177). There was a moderate positive correlation between the total number of drug therapy problems encountered and the number of drugs taken by the patients (r = 0.546, P < 0.001). The number of drugs taken by a patient was a significant predictor of the number of drug therapy problems encountered (F [2, 134] = 37.205, P < 0.001).
Conclusion: There was a high prevalence of drug therapy problems among hypertensive patients. Patients with co- morbidities and those taking multiple medications should be monitored for potential or manifest drug therapy problems.
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