The pharmacy pharmacist's performance of the family pharmacist function is expected to improve medication adherence in patients suffering from chronic diseases, including hypertension, and the same is true in infectious disease epidemics. In this study, using anonymously processed receipt data from 636 of our group's insurance pharmacies, we evaluated medication adherence of patients taking angiotensin receptor blockers (ARBs) before the COVID-19 epidemic, in the first and second years of the epidemic, in terms of medication persistence and possession, and compared them between the family pharmacist group (FP group) and non-family pharmacist group (NoFP group). The odds ratios of good medication adherence (medication persistence and possession) in the FP group to the NoFP group were 1.303 (95%CI: 1.071–1.584) before the epidemic, 1.400 (1.146–1.711) in the first year of the epidemic, and 1.264 (1.078–1.482) in the second year of the epidemic, and the FP group was significantly higher during the entire period. The results suggest that the family pharmacist function improves ARB adherence not only before the COVID-19 epidemic, but also during the epidemic.
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