The study involves healthy adult men and examines a single dose of the investigational drug BI 764198 given as a 40 mg oral solution. The medication is taken by mouth in liquid form and is being evaluated to see how it behaves inside the body.

The purpose of the study is to investigate how the drug is processed in the body. Participants will receive one dose of the oral solution and then provide urine and stool samples over several days while blood samples are taken at set times to measure the amount of drug present. This allows researchers to understand the drug’s pharmacokinetics—how it is absorbed, distributed, broken down into metabolites, and eliminated. By tracking the total amount of radioactivity recovered in urine and feces, the study assesses the mass balance of the drug, which shows what proportion of the dose is excreted and through which routes.