A Study in Healthy Men to Test How Well Different Doses of BI 3731579 Are Tolerated

The main objectives of this trial are to investigate safety, tolerability and pharmacokinetics (PK) of BI 3731579 in healthy male subjects.

Inclusion criteria 1. Healthy male subjects according to the assessment of the investigator, as based on a complete medical history including a physical examination, vital signs (blood pressure (BP), pulse rate (PR)), 12-lead electrocardiogram (ECG), and clinical laboratory tests 2. Age of 18 to 45 years (inclusive) 3. Body mass index (BMI) of 18.5 to 29.9 kg/m\^2 (inclusive) 4. Signed and dated written informed consent in accordance with International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use - Good Clinical Practice (ICH-GCP) and local legislation prior to admission to the trial Exclusion criteria 1. Any finding in the medical examination (including BP, PR or ECG) deviating from normal and assessed as clinically relevant by the investigator 2. Repeated measurement of systolic blood pressure outside the range of 90 to 140 millimeter of mercury (mmHg), diastolic blood pressure outside the range of 50 to 90 mmHg, or pulse rate outside the range of 50 to 90 beats per minute (bpm) 3. Any laboratory value outside the reference range that the investigator considers to be of clinical relevance 4. Any evidence of a concomitant disease assessed as clinically relevant by the investigator Further exclusion criteria apply