Review of Dual Biologics in Specialty Pharmacy Practice

To describe and review the published evidence on use of multiple biologics within specialty pharmacy practice.

A search of PubMed and Embase was conducted from October 2021 through September 2022. Keywords included biologics for immune-mediated conditions along with the terms "dual," "add-on," and "combination."

All human studies in the English language were considered. Published abstracts, case reports, case series, randomized controlled trials, systematic reviews, and meta-analyses were included.

Although evidence is limited, there are published meta-analyses of combined biologic use within gastroenterology and rheumatology. There are also numerous case reports within dermatology. Clinical trials of dual biologics for severe rheumatologic conditions and inflammatory bowel disease are in progress. Existing evidence for use in pulmonology and allergy suggest dual biologic therapy can be safe and effective, but data are limited. Literature describing use of monoclonal antibodies for other overlapping conditions is lacking.

This article reviews the evidence describing combination biologic use and outlines remaining knowledge gaps. It also describes the essential role that specialty pharmacists play in managing therapeutic mAbs.

High-quality evidence describing combination biologic use is limited and long-term safety data are lacking. Pharmacists should utilize their specialized training to assess appropriateness of therapy, provide patient counseling and monitor for safety and efficacy.