It is the objective of this MRD trial to investigate pharmacokinetics, pharmcodynamics, safety and tolerability of rising doses BI 691751 over a treatment period of 14 days to support the further clinical development of this LTA4H-inhibitor. Special emphasis will be given to detect potential effects of BI 691751 on heart rate.

Inclusion criteria:

• Healthy male subjects according to the investigator´s assessment, based on a complete medical history including a physical examination, vital signs (BP (blood pressure), PR (pulse rate), 12-lead ECG (electro cardiogramm), and clinical laboratory tests
• Age of 18 to 50 years (incl.)
• BMI (body mass index) of 18.5 to 29.9 kg/m2 (incl.)
• Signed and dated written informed consent prior to admission to the study in accordance with GCP(Good Clinical Practice) and local legislation
• Subject is able to understand and communicate in German

Exclusion criteria:

• Any finding in the medical examination (including BP (blood pressure), PR (pulse rate) or ECG (electro cardiogramm) is deviating from normal and judged as clinically relevant by the investigator
• Pulse rate outside 45-80 bpm (beats per minutes) or repeated measurement of systolic blood pressure greater than 140 mmHg, diastolic blood pressure greater than 90 mm Hg
• Any laboratory value outside the reference range that the investigator considers to be of clinical relevance
• Any evidence of a concomitant disease judged as clinically relevant by the investigator
• Gastrointestinal, hepatic, renal, respiratory, cardiovascular, metabolic, immunological or hormonal disorders
• Surgery of the gastrointestinal tract that could interfere with kinetics of the trial medication
• Diseases of the central nervous system (such as epilepsy), other neurological disorders or psychiatric disorders
• History of relevant orthostatic hypotension, fainting spells, or blackouts
• Chronic or relevant acute infections
• History of relevant allergy or hypersensitivity (including allergy to the trial medication or its excipients)
• Intake of drugs with a long half-life (more than 24 h) within 30 days or less than 10 half-lives of the respective drug prior to administration of trial medication
• Within 10 days prior to administration of trial medication, use of drugs that might reasonably influence the results of the trial or that might prolong the QT/QTc interval
• Participation in another trial where an investigational drug has been administered within 60 days prior to planned administration of trial medication
• Smoker (more than 10 cigarettes or 3 cigars or 3 pipes per day)
• Inability to refrain from smoking during inhouse-confinement
• Alcohol abuse (consumption of more 30 g per day for males)
• Drug abuse or positive drug screening
• Blood donation of more than 100 mL within 30 days prior to administration of trial medication or intended donation during the trial
• Intention to perform excessive physical activities within one week prior to administration of trial medication or during the trial
• Inability to comply with dietary regimen of trial site
• A marked baseline prolongation of QT/QTc interval (such as QTc intervals that are repeatedly greater than 450 ms in males) or any other relevant ECG finding at screening
• A history of additional risk factors for Torsades de Pointes (such as heart failure, hypokalemia, or family history of Long QT Syndrome)
• Subject is assessed as unsuitable for inclusion by the investigator, for instance, because considered not able to understand and comply with study requirements, or has a condition that would not allow safe participation in the study
• Vulnerable subjects, e.g. subjects kept in detention, soldiers, employees of the sponsor or a clinical research organization, involved in this study

Treated set which included all subjects who received at least one dose of study drug.

From the time of administration of the respective treatment until 21 days after last administration of study drug or start of the post-study phase to the respective treatment, up to 35 days

The trial was terminated prematurely because the sponsor decided to discontinue the development of BI 691751, also no PK blood samples were analysed because of the trial termination.