Increase in veterinary prescriptions of azithromycin during the COVID-19 pandemic in Brazil

With the advent of the pandemic in 2020 and the lack of perspectives on the treatment of COVID-19, numerous therapeutic proposals have emerged, including hydroxychloroquine and azithromycin. Therefore, some studies have shown that in many countries, the demand for azithromycin has increased during the pandemic. In Brazil, antibiotics can only be purchased with a medical, dental, or veterinary prescription. This study aimed to determine whether the number of prescriptions made by veterinarians (which could be used by humans) has increased during the pandemic.

Data on the purchase of antibiotics made under veterinary prescriptions in Brazilian pharmacies between 2014 and 2021 were collected. To assess the changes in monthly trends in the use of the selected antibiotics, we applied the Joinpoint regression.

The most prescribed antibiotic in all years was cephalexin (35%), followed by amoxicillin (24%). During the pandemic, sales of azithromycin substantially increased. Regression analysis showed that since 2014, azithromycin prescriptions grew by an average of 0.67% per month. At the beginning of the pandemic, the monthly growth rate became 12.64%. When comparing azithromycin sales during the pandemic with the historical average (2014-2019), the increase was 41%.

During the pandemic, there was no animal health situation in Brazil that required the use of this antibiotic. Veterinary prescriptions may have been an instrument for human access to azithromycin for the treatment of COVID-19. Stricter enforcement policies are needed to address this problem to avoid antimicrobial resistance.