Drug therapy problems, medication adherence and treatment satisfaction among diabetic patients on follow-up care at Tikur Anbessa Specialized Hospital, Addis Ababa, Ethiopia

Patients with diabetes are at high risk of drug therapy problems (DTPs), as they are receiving multiple medications. To date, studies regarding DTPs in patients with diabetes in Ethiopia are limited. The aim of this study was to assess prevalence of DTPs, medication adherence and treatment satisfaction of patients with diabetes at Tikur Anbessa Specialized Hospital (TASH). A cross-sectional study was conducted on randomly selected 418 participants who fulfilled the inclusion criteria. Data were collected using structured questionnaire and patients' chart review. Cipolle's classification system was used to determine DTPs. Modified Morisky's Adherence Scale (MMAS-8) was used to measure patients' adherence to their medication. Treatment Satisfaction with Medicines Questionnaire (SATMED-Q) patient satisfaction assessment questionnaire was used to assess patients' treatment satisfaction. A total of 207 DTPs in 177 (42.3%) of participants were identified. Commonly identified DTPs were dosage too low (58, 28.0%), ineffective drug therapy (54, 26.1%), and need additional drug therapy (52, 25.1%). Factors associated with DTPs were female gender (Adjusted Odds Ratio [AOR] = 2.31,95% CI:1.30-4.12); ≥3comorbidities (AOR = 3.61, 95% CI:1.19-10.96); ever married (AOR = 2.58,95% CI:1.23-5.48); type 2 diabetes (AOR = 5.62, 95% CI:1.21-26.04); non-adherence (AOR = 5.26,95% CI:2.51-11.04) and residence out of Addis Ababa (AOR = 0.30, 95% CI:0.12-0.73). Twenty four percent of participants were non-adherent to their drug therapies. Factors associated with non-adherence were diabetes complications (AOR = 2.00, 95% CI: 1.2-3.32), the female gender (AOR = 1.67, 95%CI: 1.01-2.8) and level of education (AOR = 0.42, 95%CI: 0.18-0.96). Eighty one percent of participants were satisfied with the current treatment. A significant proportion of patients were satisfied with their treatment and a quarter of the study participants were non-adherent to their medications at TASH diabetic clinic. However, DTPs were considerably higher among the study participants. Hence, future interventions targeting prevention and resolution of DTPs deemed to be necessary.