Plonsk

This research aims to compare two ways of giving the drug bimekizumab to adults with active psoriatic arthritis or active axial spondyloarthritis. The study focuses on whether giving bimekizumab through an intravenous (IV) injection is not worse than giving it as a subcutaneous (under the skin) injection. The trial is designed as an open-label, randomized, parallel-group, noninferiority phase 1 study to evaluate how the drug moves and stays in the body over time. Participants will receive bimekizumab at scheduled times either through one of two intravenous regimens or a subcutaneous regimen. Each group will follow a specific dosing plan to see how the drug behaves in the body depending on the method of administration. The study treatments are given at pre-set time points, and the goal is to measure drug concentrations in the blood. During the study, participants will be monitored and assessed for the drug concentration in their blood at week 16 to understand steady-state trough levels. Researchers will also check for safety and tolerability throughout the study. The total duration and further assessments are not specified, but the focus is on comparing the drug levels and safety between the different administration methods in adults with these active conditions.