Study to investigate the effect of the P-gp and cytochrome P450 (CYP) 3A4 inhibitor ritonavir on the pharmacokinetics of BI 1356

Inclusion Criteria:

• Healthy males according to the following criteria: Based upon a complete medical history, including the physical examination, vital signs (blood pressure (BP), pulse rate (PR)), 12-lead electrocardiogram (ECG), clinical laboratory tests
• Age ≥ 18 and Age ≤ 50 years
• BMI ≥ 18.5 and BMI ≤ 29.9 kg/m2 (Body Mass Index)
• Signed and dated written informed consent prior to admission to the study in accordance with good clinical practice (GCP) and the local legislation

Exclusion Criteria:

• Any finding of the medical examination (including BP, PR and ECG) deviating from normal and of clinical relevance
• Any evidence of a clinically relevant concomitant disease
• Gastrointestinal, hepatic, renal, respiratory, cardiovascular, metabolic, immunological or hormonal disorders
• Surgery of the gastrointestinal tract (except appendectomy)
• Diseases of the central nervous system (such as epilepsy) or psychiatric disorders or neurological disorders
• History of relevant orthostatic hypotension, fainting spells or blackouts
• Chronic or relevant acute infections (e.g. HIV)
• History of relevant allergy/hypersensitivity (including allergy to drug or its excipients)
• Intake of drugs with a long half-life (> 24 hours) within at least one month or less than five half-lives of the respective drug prior to administration or during the trial
• Use of drugs which might reasonably influence the results of the trial (especially unspecific inducing agents like St.John´s wort (Hypericum perforatum) or drugs which prolong the QT/QTc interval based on the knowledge at the time of protocol preparation within 10 days prior to administration or during the trial
• Participation in another trial with an investigational drug within two months prior to administration or during the trial
• Smoker (> 10 cigarettes or > 3 cigars or > 3 pipes/day)
• Inability to refrain from smoking on trial days
• Alcohol abuse (more than 60 g/day) or inability to stop alcoholic beverages for 24 hours prior to dosing and up to the last sampling time point
• Drug abuse
• Blood donation (more than 100 mL within four weeks prior to administration or during the trial)
• Excessive physical activities (within one week prior to administration or during the trial)
• Any laboratory value outside the reference range that is of clinical relevance
• Inability to comply with dietary regimen of trial site
• A marked baseline prolongation of QT/QTc interval (e.g., repeated demonstration of a QTc interval >450 ms)
• A history of additional risk factors for torsades de points (e.g., heart failure, hypokalemia, family history of Long QT Syndrome)

Exclusion criteria specific for this study:

• Galactose intolerance
• Lactase deficiency
• Glucose-galactose-malabsorption