Lyme disease chemoprophylaxis prescribing before and after pharmacist prescriptive authority in Nova Scotia

Abstract

Background: Lyme disease is a bacterial infection transmitted to humans through bites from infected Ixodes species of ticks. Prophylaxis with a single dose of oral doxycycline following a bite from an infected tick reduces the risk of developing Lyme disease. Pharmacists in Nova Scotia (NS) were among the first in Canada to prescribe for this indication. The primary objective of this study is to describe experiences with pharmacist prescribing of prophylaxis after tick bites in NS.

Methods: A retrospective cohort study was performed using health administrative data 16 months before and after pharmacists were authorized to prescribe Lyme disease chemoprophylaxis (August 1, 2021). All dispensations of a single dose of oral doxycycline from a community pharmacy in NS were included. Data collected included prescriber type, date, and county of dispensation. Comparisons of dispensations were completed before and after pharmacists gained prescriptive authority and relative to other prescribers. Dispensations were described descriptively.

Results: Over the study period, 12,549 single-dose doxycycline prescriptions were dispensed in NS: 3900 prescriptions were dispensed before pharmacist prescribing authorization for this indication occurred and 8649 were dispensed after. Pharmacists prescribed 61.3% of all single-dose doxycycline prescriptions following implementation of prescribing authority.

Discussion: An increase in single-dose doxycycline prescriptions was observed in NS. Pharmacists have become the primary prescribers for Lyme disease chemoprophylaxis in the province.

Conclusion: Patients were willing to be assessed for chemoprophylaxis after tick exposure by pharmacists, and pharmacist prescribing for this indication suggests increased access to post-tick exposure care.

Figure 1

Number of single-dose doxycycline prescriptions dispensed in Nova Scotia (April 2020 to November 2022)