IbalizumabBettiker, Robert L.a; Koren, David E.d; Jacobson, Jeffrey M.a,b,cCurrent Opinion in HIV and AIDS: July 2018 - Volume 13 - Issue 4 - p 354–358 doi: 10.1097/COH.0000000000000473 NEW HIV DRUGS: Edited by Roy M. Gulick Buy Abstract Author InformationAuthors Article MetricsMetrics Purpose of review Antiretroviral options for patients infected with multiclass resistant HIV-1 warrant the development of new agents with unique mechanisms of action and modes of delivery. Here we review one such agent, ibalizumab, a parenteral CD4 postattachment inhibitor that has demonstrated efficacy as part of combination antiretroviral therapy in the treatment of HIV-1. Recent findings In a phase III clinical trial in HIV-infected participants with multiclass antiretroviral drug resistance, the intravenous administration of ibalizumab led to declines in plasma HIV-1 RNA more than 0.5 log in 83% of participants at 1 week. An optimized background antiretroviral regimen was then added, and plasma HIV-1 RNA became less than 50 copies/ml in 43% of participants at 24 weeks. Adverse effects of ibalizumab were uncommon and generally low grade. Ibalizumab was approved by the US Food and Drug Administration on March 16, 2018, under the trade name Trogarzo. Summary Ibalizumab has demonstrated both safety and efficacy in the treatment of HIV-1 infection. Its primary use will be in the setting of multidrug resistant virus as part of combination antiretroviral therapy. Further enhancements of ibalizumab to prolong its clearance and broaden its activity are in development. aDepartment of Medicine bDepartment of Neuroscience cCenter for Translational AIDS Research, Lewis Katz School of Medicine at Temple University, Philadelphia dTemple University Hospital, Philadelphia, Pennsylvania, USA Correspondence to Jeffrey M. Jacobson, Center for Translational AIDS Research, Lewis Katz School of Medicine at Temple University, 3500 N. Broad Street, Philadelphia, PA 19140, USA; Tel: +1 215 707 6451; e-mail: firstname.lastname@example.org Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.