Implementation of a Pharmacist-Driven Detailed Penicillin Allergy Interview

Background: Self-reported penicillin allergies may be outdated or inaccurate, leading to the use of alternative antimicrobials that may be less effective, more toxic, and/or more expensive. Although penicillin skin tests can provide accurate assessments of penicillin allergies, these procedures are not feasible at all institutions. Another solution is to conduct a detailed penicillin allergy interview (DPAI), which can potentially lead to optimization of antimicrobial therapy. Objective: The purpose of this study was to assess the impact of a pharmacist-driven DPAI protocol. The primary objective was to measure the number of patients requiring a change to their allergy profile following DPAI. Secondary objectives included characterizing allergy profile updates and measuring the number of recommendations to switch to a β-lactam agent, provider acceptance rate, and patient tolerance. Methods: Standardized pharmacist-driven DPAIs were conducted prospectively on adult patients admitted with a documented penicillin allergy. The allergy profile within the electronic health record (EHR) was updated and a recommendation to switch to noncarbapenem β-lactam therapy was made when indicated by a decision algorithm. Results: A total of 175 (37.5%) patients received a DPAI. Of these, 133 (76.0%) required a change to their allergy profile. Additionally, 135 (77.1%) patients interviewed were on antimicrobial therapy, with 42 (31.1%) meeting criteria to switch to noncarbapenem β-lactam therapy; of which 31 (73.8%) patients were successfully transitioned, with no signs or symptoms of intolerance. Conclusions and Relevance: Implementation of pharmacist-driven DPAIs can provide updated and corrected allergy information within the EHR, allowing for de-escalation and/or optimization of antimicrobial therapy.