Prevalence of use and sources of antihypertensive medicine in Brazil: an analysis of the VIGITEL telephone survey.

OBJECTIVE The prevalence of hypertension in Brazil and worldwide has been increasing in recent decades, and drug therapy is one of the strategies used to control this condition. The objective of this study was to estimate the prevalence of use and identify the sources for obtaining antihypertensive drugs in Brazil, according to sociodemographic variables, comparing three periods: 2011, 2014 and 2017. METHODS Data from individuals aged ≥20 years who reported a medical diagnosis of hypertension, interviewed by Vigitel in 2011, 2014 and 2017 were used. Frequency and prevalence of drug use in addition to the sources for obtaining medication were estimated by sociodemographic variables, with 95% confidence intervals. The differences between proportions were verified by Pearson's chi-square test (Rao-Scott), with a significance level of 5%. RESULTS The prevalence of antihypertensive drug use remained stable (80%). Regarding the sources for obtaining these medicines, there was variation in the period, indicating a decrease in usage through the Brazilian Unified Health System (SUS) (44.2% in 2011; 30.5% in 2017). This decrease was accompanied with increase in PFPB (16.1% in 2011; 29.9% in 2017). The prevalence of other sources for obtaining medicine (private pharmacies/drugstores) showed stability in the period. CONCLUSIONS The prevalence of medication use remained high and there was a change in the pattern of use according to sources, demonstrating migration between SUS pharmacies to the PFPB, and suggesting a reduction in the availability of medicines from public pharmacies universally, and for free.