Background: Infliximab, an anti-tumor necrosis factor monoclonal antibody, has revolutionized the pharmacological management of immune-mediated inflammatory diseases (IMIDs). This position statement critically reviews and examines existing data on therapeutic drug monitoring (TDM) of infliximab in patients with IMIDs. It provides a practical guide on implementing TDM in current clinical practices and outlines priority areas for future research., Methods: The endorsing TDM of Biologics and Pharmacometrics Committees of the International Association of TDM and Clinical Toxicology collaborated to create this position statement., Results: Accumulating data support the evidence for TDM of infliximab in the treatment of inflammatory bowel diseases, with limited investigation in other IMIDs. A universal approach to TDM may not fully realize the benefits of improving therapeutic outcomes. Patients at risk for increased infliximab clearance, particularly with a proactive strategy, stand to gain the most from TDM. Personalized exposure targets based on therapeutic goals, patient phenotype, and infliximab administration route are recommended. Rapid assays and home sampling strategies offer flexibility for point-of-care TDM. Ongoing studies on model-informed precision dosing in inflammatory bowel disease will help assess the additional value of precision dosing software tools. Patient education and empowerment, and electronic health record-integrated TDM solutions will facilitate routine TDM implementation. Although optimization of therapeutic effectiveness is a primary focus, the cost-reducing potential of TDM also merits consideration., Conclusions: Successful implementation of TDM for infliximab necessitates interdisciplinary collaboration among clinicians, hospital pharmacists, and (quantitative) clinical pharmacologists to ensure an efficient research trajectory., Competing Interests: Z. Wang is supported by a doctoral research grant from the Research Foundation—Flanders (FWO), Belgium (grant number: 1SF2922N). M. Barclay received consultancy fees from Douglas Pharmaceuticals and Janssen unrelated to submitted work. T. Mizuno served as a consultant of NDA Partners and received speaker honoraria from Astellas Pharma Inc. and Chugai Pharmaceutical Co. R. J. Keizer is an employee and stockholder of InsightRX, a company developing precision dosing software. S. G. Wicha received research grants from Boehringer Ingelheim and AqVida, consulting fees from Merck KGaA and Medicines from Malaria Venture, and speaker honoraria from GlaxoSmithKline. J. Lambert received unrestricted grants from AbbVie, Almirall, Celgene, Eli Lilly, Janssen-Cilag, LEO Pharma, Novartis, and UCB, served as a speaker for AbbVie, Almirall, Bristol-Myers Squibb, Janssen-Cilag, Pfizer, and UCB, and served as a consultant for AbbVie, argenx, Bristol-Myers Squibb, Celgene, Celltrion, Eli Lilly, Janssen-Cilag, LEO Pharma, Novartis, and UCB, with all fees and grants being paid to Ghent University (Hospital) scientific accounts and not to any personal account of Jo Lambert. S. Vermeire received grants from AbbVie, J&J, Pfizer, Galapagos, and Takeda, received consulting and/or speaker fees from AbbVie, AbolerIS Pharma, AgomAb, Alimentiv, Arena Pharmaceuticals, AstraZeneca, Avaxia, BMS, Boehringer Ingelheim, Celgene, CVasThera, Dr Falk Pharma, Ferring, Galapagos, Genentech-Roche, Gilead, GSK, Hospira, Imidomics, Janssen, J&J, Lilly, Materia Prima, MiroBio, Morphic, MRM Health, Mundipharma, MSD, Pfizer, Prodigest, Progenity, Prometheus, Robarts Clinical Trials, Second Genome, Shire, Surrozen, Takeda, Theravance, Tillots Pharma AG, and Zealand Pharma. K. Papamichael received lecture/speaker fees from Physicians Education Resource LLC and Grifols, scientific advisory board fees from ProciseDx Inc. and Scipher Medicine Corporation, and serves as a consultant from Prometheus Laboratories Inc. E. Dreesen received consultancy fees from Alimentiv, argenx, and Prometheus, lecture fees from Galapagos, and financial support from Janssen and Sandoz, outside the submitted work, with all honoraria/fees being paid to KU Leuven and not to any personal account of Erwin Dreesen. D. Alsoud, D. J. A. R. Moes, R. Soenen, Z. Layegh, I. K. Minichmayr, G. Wolbink, A. de Vries, and N. Padullés-Zamora declare that they have no conflicts of interest., (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)