To determine the relative bioavailability of an BI 187004 tablet formulation compared to an oral solution of BI 187004 and to assess the influence of food on the bioavailability of the tablet formulation.

Inclusion criteria:

1. Healthy male subjects
2. Age of 18 to 50 years
3. Body mass index (BMI) of 18.5 to 29.9 kg/m2

Exclusion criteria:

1. Any finding in the medical examination (including BP, pulse rate (PR) or ECG) is deviating from normal and judged as clinically relevant by the investigator
2. Repeated measurement of systolic blood pressure outside the range of 90 to 140 mmHg, diastolic blood pressure outside the range of 50 to 90 mmHg, or pulse rate outside the range of 50 to 90 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 judged as clinically relevant by the investigator
5. Gastrointestinal, hepatic, renal, respiratory, cardiovascular, metabolic, immunological or hormonal disorders
6. Surgery of the gastrointestinal tract that could interfere with kinetics of the trial medication (except appendectomy and simple hernia repair)
7. Diseases of the central nervous system (such as epilepsy), other neurological disorders or psychiatric disorders