Relative Bioavailability Study

Inclusion Criteria: * Healthy male subject * Age: 18 to 45 years (inclusive) at the first screening examination * Ethnicity: white * Body mass index (BMI): \>18 and \<29.9 kg/m2 Exclusion Criteria: * Incompletely cured pre-existing diseases for which it can be assumed that the absorption, distribution, metabolism, elimination, or effects of the study drug will not be normal * History of coronary artery disease * Symptomatic postural hypotension (e.g. dizziness, lightheadedness) * History of bronchial asthma or any other airway disease * Smoking (former smokers who have stopped smoking at least 3 months before the first study drug administration may be included) * Clinically relevant findings in the ECG such as a second- or third-degree atrioventricular block, prolongation of the QRS complex over 120 ms or of the QTc interval (QT interval corrected for heart rate) over 450 ms * Systolic blood pressure below 100 or above 145 mmHg * Diastolic blood pressure below 50 or above 95 mmHg * Heart rate below 45 or above 95 beats per minute