To investigate the safety, tolerability, pharmacokinetics, and pharmacodynamics of BI 44847

Inclusion Criteria:

1. Healthy males according to the following criteria:

   Based upon a complete medical history, including the physical examination, vital signs (BP, HR), 12-lead ECG, clinical laboratory tests

2. Age ≥ 18 and Age ≤ 50 years

3. BMI ≥ 18.5 and BMI ≤ 29.9 kg/m2 (Body Mass Index)

4. Signed and dated written informed consent prior to admission to the study in accordance with Good Clinical Practice and the local legislation

Exclusion Criteria:

1. Any finding of the medical examination (including BP, pulse rate and ECG) deviating from normal and of clinical relevance
2. Any evidence of a clinically relevant concomitant disease
3. Gastrointestinal, hepatic, renal, respiratory, cardiovascular, metabolic, immunological or hormonal disorders
4. Diseases of the central nervous system (such as epilepsy) or psychiatric disorders or neurological disorders
5. History of relevant orthostatic hypotension, fainting spells or blackouts
6. Chronic or relevant acute infections
7. History of relevant allergy/hypersensitivity (including allergy to drug or its excipients)
8. Intake of drugs with a long half-life (> 24 hours) within at least one month or less than 10 half-lives of the respective drug prior to administration or during the trial
9. Use of drugs which might reasonably influence the results of the trial based on the knowledge at the time of protocol preparation within 10 days prior to administration or during the trial
10. Participation in another trial with an investigational drug within two months prior to administration or during the trial
11. Smoker (> 10 cigarettes or > 3 cigars or > 3 pipes/day)
12. Inability to refrain from smoking on trial days
13. Alcohol abuse (more than 60 g/day)
14. Drug abuse
15. Blood donation (more than 100 mL) within four weeks prior to administration or during the trial
16. Excessive physical activities (within one week prior to administration or during the trial)
17. Any laboratory value outside the reference range that is of clinical relevance
18. Inability to comply with dietary regimen of study centre
19. Any ECG value outside of the reference range and of clinical relevance including, but not limited to QRS interval > 120 ms. A marked baseline prolongation of QT/QTc interval (e.g., repeated demonstration of a QTc interval > 450 ms or QT> 500 ms).
20. A history of additional risk factors for Torsade des Pointes (e.g., heart failure, hypokalemia, family history of Long QT Syndrome)
21. The use of concomitant medications that prolong the QT/QTc interval
22. Elevated urinary glucose levels at screening (> 15 mg/dl)