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This study compared the pharmacokinetic (PK) profile of a new liquid formulation of mepolizumab with the established lyophilized formulation. In this open‐label, parallel‐group, single‐dose study (NCT03014674; GSK ID: 204958), healthy participants were randomized (1:1:1) to receive a single mepolizumab dose (100 mg) administered subcutaneously as liquid in a single‐use prefilled syringe or single‐use prefilled autoinjector, or as a lyophilized formulation. Maximum plasma concentration, area under the plasma concentration–time curve from time zero (predose) to time of last quantifiable concentration (AUC 0–t ), and AUC from time zero to infinity (AUC 0–∞ ) as well as additional PK parameters, safety assessments, and blood eosinophil count were evaluated. In total, 244 participants received study drug. All PK parameters were similar across the 3 groups; 90% confidence intervals for maximum plasma concentration, AUC 0–t , and AUC 0–∞  treatment ratios (liquid prefilled syringe or autoinjector vs lyophilized formulation) were within conventional bioequivalence bounds (0.80‐1.25), demonstrating statistical PK comparability. On‐treatment adverse event incidence was 29% to 38%. Mepolizumab liquid formulation administered via prefilled syringe or autoinjector had similar PK properties to the lyophilized formulation, with no safety concerns identified.

clinical pharmacology in drug development

The Pharmacokinetics and Relative Bioavailability of Mepolizumab 100 mg Liquid Formulation Administered Subcutaneously to Healthy Participants: A Randomized Trial