Safety, Pharmacodynamics, Pharmacokinetics, and Immunogenicity of Ascending Doses BCD-261 in Healthy Subjects

This early-phase study is testing a new drug called BCD-261 in healthy volunteers to assess how safe it is, how the body processes it, and what effects it has at different doses. This is an early safety and dose-finding study — not a treatment trial for sick patients. **You may be eligible if...** - You are a healthy male aged 18 to 45 years - (For some cohorts) You identify as Asian - You have no chronic or acute medical conditions - Your blood pressure and heart rate are within normal ranges - You are willing to use contraception and avoid sperm donation during and after the study **You may NOT be eligible if...** - You have any respiratory, heart, nervous system, gastrointestinal, liver, or kidney conditions - You are not able to comply with study procedures - You are participating in another clinical trial - You have any relevant allergies or significant medical history Talk to your doctor to see if this trial is right for you.