Pharmacokinetic Profile of Betahistine With and Without Selegiline in Healthy Volunteers

Diagnosis and main criteria for inclusion: * Adult healthy volunteers, males and non-pregnant, non-breastfeeding woman with adequate contraception * Subjects must meet all of the following inclusion criteria to be eligible for enrolment into the trial: * Healthy volunteers (age ≥ 18 years and ≤ 70 years) as determined by screening * and Principal Investigator's judgement * No intake of medication due to an illness * Written informed consent of the subject * Systolic blood pressure between 90 and 140 mmHg and diastolic blood pressure between 60 and 90 mmHg at screening * PQ interval in the ECG between 0.12 s and 0.20 s * Duration of the QRS complex between 0.06 s and 0.10 s * QTc interval 440 ms or less * Heart rate between 60 and 100 beats per minute * Subjects with the ability to follow study instructions and likely to attend and complete all required visits Subjects presenting with any of the following exclusion criteria were not included in the trial: * Subject is not able to give consent * A condition in which repeated serum draws or injections pose more than minimal risk for the subjects, such as haemophilia, other severe coagulation disorders or significantly impaired venous access * Participation in another study with an investigational drug or device within the last 30 days, prior participation in the present study, or planned participation in another trial * Intake of medication due to an illness * Subjects with a physical or psychiatric condition which at the investigator's discretion may put the subject at risk, may confound the trial results, or may interfere with the subject's participation in the clinical trial before participation in this study * Current or planned pregnancy or breastfeeding woman * Woman of childbearing potential who is not willing to use medically reliable methods of contraception for the entire study duration * Intake of alcohol 24 hours before first IMP intake or during study participation * Known or persistent abuse of medication, drugs or alcohol (positive test for alcohol or drugs) * Known contraindications for Betahistine, such as bronchial asthma, pheochromocytoma, treatment with antihistaminic drugs, ulcer of the stomach or duodenum, severe dysfunction of liver or kidney, hypersensitivity to Betahistine or other ingredients * Known contraindications for Selegiline, e.g. use of opioids, tricyclic antidepressants, sympathomimetics, non-selective MAOIs, (selective) serotonin (-noradrenaline) re-uptake inhibitors (SSRI/SNRI), serotonin agonists, hypersensitivity to Selegiline or other ingredients * Hereditary intolerance to galactose, hereditary deficiency of lactose, glucose-galactose-malabsorption * AV Block in the ECG * Hypotonic or hypertonic subjects according to the criteria of the National Heart, Lung and Serum Institute (Hypertension \> 90/140 mmHg, Hypotension \< 90/60 mmHg)