Pharmacokinetics of BIA 9-1067 and Its Metabolites in Healthy Male Elderly Subjects and in Healthy Male Young Subjects

Inclusion Criteria: All subjects (young and elderly): 1. A signed and dated informed consent form before any study-specific screening procedure is performed. 2. Healthy as determined by the investigator on the basis of medical history, physical examination, clinical laboratory test results, vital signs and digital 12-lead electrocardiogram (ECG). 3. Non-smoker or smoker of fewer than 10 cigarettes per day as determined by history. Had to be able to abstain from smoking during the inpatient stay. 4. With a body mass index (BMI) between 19 and 30 kg/m2, inclusive. Young subjects only: 5. Males aged between 18 and 40 years, inclusive. Elderly subjects only: 6. Males older than 65 years, inclusive. Exclusion Criteria: All subjects (young and elderly): General 1. Subjects who had participated in a clinical trial with an investigational drug within the 90 days prior to screening. 2. Subjects who were likely to be noncompliant with the protocol, or who were felt to be unsuitable by the Investigator for any other reason. 3. Positive serologic findings for human immunodeficiency virus (HIV) antibodies, hepatitis B surface antigen (HBsAg), and/or hepatitis C virus (HCV) antibodies. 4. Positive findings of urine drug screen (amphetamines, barbiturates, benzodiazepines, cannabinoids, cocaine, methadone, opiates, MDMA \[3,4-ethylenedioxymethamphetamine; ecstasy\]). Medical History 5. Any significant cardiovascular, hepatic, renal, respiratory (e.g. childhood asthma), gastrointestinal, endocrine (e.g. diabetes,), immunological, dermatological, haematological, neurological, or psychiatric disease and history thereof. 6. Acute disease state (e.g., nausea, vomiting, fever, diarrhoea) within 7 days before study Day 1. 7. History of drug abuse within 1 year before study Day 1. 8. History of alcoholism within 1 year before Day 1. Consumption of more than 50 g of ethanol per day (12.5 cL glass of 10° \[10%\] wine = 12 g; 4 cL of aperitif, 42° \[42%\] whiskey = 17 g; 25 cL glass of 3° \[3%\] beer = 7.5 g; 25 cL glass of 6° \[6%\] beer = 15 g). 9. History of any clinically important drug allergy. 10. Had previously received BIA 9-1067. Prohibited treatments and dietary restrictions 11. Consumption of any caffeine-containing products (e.g., coffee, tea, chocolate, or soda) in excess of 6 cups per day (or equivalent), of grapefruit, grapefruit-containing products, or alcoholic beverages within 24 hours before study Day 1. 12. Use of any over-the-counter drugs including herbal supplements (except for the occasional use of acetaminophen \[paracetamol\], aspirin and vitamins ≤100% recommended daily allowance) within 7 days before IMP administration. 13. Donation of blood (i.e. 450 ml) within 60 days before study Day 1. Young subjects only: Prohibited treatments and dietary restrictions 14. Prohibited Treatments: use of any investigational drug within 90 days (young and elderly subjects) or prescription drug within 30 days before investigational medical product (IMP) administration. Elderly subjects only: Prohibited treatments and dietary restrictions 15. For elderly subjects, previously prescribed medications that do not interfere with absorption, distribution, metabolism, and excretion or safety/tolerability evaluation of BIA 9-1067 and adrenal or renal function were allowed if the dose regimen had been stable for at least 4 weeks and was expected to remain stable throughout the study. Such concomitant medications was reviewed and mutually agreed upon by the sponsor and the investigator.