Adherence to self-administered biologic disease-modifying antirheumatic drugs across health-system specialty pharmacies.

PURPOSE: Adherence to self-administered biologic disease-modifying antirheumatic drugs (bDMARDs) is necessary for therapeutic benefit. Health-system specialty pharmacies (HSSPs) have reported high adherence rates across several disease states; however, adherence outcomes in rheumatoid arthritis (RA) populations have not yet been established. METHODS: We performed a multisite retrospective cohort study including patients with RA and 3 or more documented dispenses of bDMARDs from January through December 2018. Pharmacy claims were used to calculate proportion of days covered (PDC). Electronic health records of patients with a PDC of <0.8 were reviewed to identify reasons for gaps in pharmacy claims (true nonadherence or appropriate treatment holds). Outcomes included median PDC across sites, reasons for treatment gaps in patients with a PDC of <0.8, and the impact of adjusting PDC when accounting for appropriate therapy gaps. RESULTS: There were 29,994 prescriptions for 3,530 patients across 20 sites. The patient cohort was mostly female (75%), with a median age of 55 years (interquartile range [IQR], 42-63 years). The median PDC prior to chart review was 0.94 (IQR, 0.83-0.99). Upon review, 327 patients had no appropriate treatment gaps identified, 6 patients were excluded due to multiple unquantifiable appropriate gaps, and 420 patients had an adjustment in the PDC denominator due to appropriate treatment gaps (43 instances of days' supply adjusted based on discordant days' supply information between prescriptions and physician administration instructions, 11 instances of missing fills added, and 421 instances of clinically appropriate treatment gaps). The final median PDC after accounting for appropriate gaps in therapy was 0.95 (IQR, 0.87-0.99). CONCLUSION: This large, multisite retrospective cohort study was the first to demonstrate adherence rates across several HSSPs and provided novel insights into rates and reasons for appropriate gaps in therapy.

Impact of a specialty pharmacy case management service on adherence in patients receiving oral antineoplastic agents.

Background Patients receiving treatment with oral antineoplastic agents encounter several barriers to adherence, which may include high medication costs, limited access to specialty medications, severe adverse effects, complex medication regimens, and special handling precautions. Medication nonadherence not only reduces the efficacy of drug therapy but also has the potential to increase healthcare expenditures due to disease-related hospitalizations. Although several previous studies have examined patient adherence to oral antineoplastic agents, few have examined the impact of a specialty pharmacy case management service. Methods Patient adherence to oral antineoplastic agents was evaluated through a retrospective analysis of pharmacy claims data and medical chart reviews. The medication possession ratio (MPR) was used to quantitatively measure adherence during two 6-month intervals, prior to and following the implementation of a case management service. Patients with an MPR greater than or equal to 0.8 were categorized as adherent, while those with an MPR less than 0.8 were categorized as non-adherent. Results During the first 6-month interval prior to implementation of the case management service (n = 40), a cumulative average MPR of 0.922 was observed. Following implementation of the case management service (n = 56), a non-statistically significant (p = 0.199) increase in MPR to 0.941 was identified. For patients categorized as non-adherent, a nonstatistically significant (p = 0.214) decrease from 15% to 7% was identified following the introduction of the case management service. Conclusion Study results from this retrospective review indicate that case management services provided through an outpatient specialty pharmacy may have the potential to improve patient adherence to oral antineoplastic agents.