Bioequivalence of Two Different Oral Solutions Tipranavir Administered in Combination With Ritonavir to Healthy Volunteers

Inclusion Criteria: * Healthy males and females according to the following criteria based upon a complete medical history, including the physical examination, vital signs (BP, PR), 12-lead ECG, clinical laboratory tests * Age ≥ 18 and ≤ 55 years * BMI ≥ 18.5 and ≤ 29.9 kg/m2 (Body Mass Index) and body weight \> 55 kg * Signed and dated written informed consent prior to admission to the study in accordance with Good Clinical Practice 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 * History of relevant allergy/hypersensitivity (including allergy to tipranavir or ritonavir or their excipients) * 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 of the trial drug or during the trial * Cytochrome P 450 (CYP3A4)-inhibiting drugs (e.g. itraconazole, ketoconazole, protease inhibitors, erythromycin, clarithromycin, telithromycin, nefazodone, cyclosporin, verapamil, amiodarone, diltiazem), CYP3A4 inducing drugs (e.g. St. John´s wort \[Hypericum perforatum\], rifampin, dexamethasone) or CYP3A4 substrates (e.g. triazolam, sertraline); further drugs which might reasonably influence the results of the trial (e.g. drugs which contain polyethylene glycol) or drugs that prolong the QT/corrected QT interval interval (based on the knowledge at the time of protocol preparation) within 14 days prior to first administration of the trial drug or during the trial * Participation in another trial with an investigational drug within two months prior to administration of the trial drug or during the trial * Smoker (\> 10 cigarettes or \> 3 cigars or \> 3 pipes/day) * Inability to refrain from smoking within 24 hours before or after administration of the trial drug * Alcohol abuse (more than 60 g/day) * Drug abuse * Blood donation (more than 100 mL within four weeks prior to administration of the trial drug or during the trial) * Excessive physical activities (within one week prior to administration of the trial drug 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 Pointes (TdP), e.g., heart failure, hypokalaemia, family history of Long QT Syndrome * Known hypersensitivity to antiretroviral drugs (marketed or experimental use as part of clinical research studies) * Personal or family history of coagulation or bleeding disorders or bleeding tendencies * Intake of vitamin E within 14 days prior to the first drug administration of this trial or during the trial * Transaminase values (ALT /AST) greater than the upper limit of the normal laboratory reference range during screening For female subjects: * Pregnancy or positive pregnancy test, or planning to become pregnant during the study or within 1 month of study completion * No adequate contraception during the study and until 1 month of study completion, i.e. not any of the following: implants, injectables, combined oral contraceptives, intrauterine device, sexual abstinence (for at least 1 month prior to enrolment), vasectomised partner (vasectomy performed at least 1 year prior to enrolment), or surgical sterilisation (incl. hysterectomy). Females who do not have a vasectomised partner, are not sexually abstinent or surgically sterile will be asked to additionally use barrier contraception methods (e.g. condom, diaphragm with spermicide). * Lactation period