Effect of BIA 9-1067 on the Pharmacokinetics and Pharmacodynamics of Warfarin

The purpose of this study is to investigate CYP2C9 inhibition by BIA 9-1067 through the assessment of its effect on the pharmacokinetics of S-warfarin, a substrate of CYP2C9.

Single-centre, open-label, randomised, two-way crossover study in healthy young male and female volunteers. The study was to consist of 2 treatment periods separated by a washout period of 14 days or more. In one period, subjects were to receive a single-dose of 25 mg BIA 9-1067 with a single-dose of racemic 25 mg warfarin. In the other period, a 25 mg warfarin single-dose was to be administered alone.

Eligibility Criteria:
Inclusion Criteria:

* Able and willing to give written informed consent.
* Male or female subjects aged between 18 and 45 years, inclusive.
* Subjects of body mass index (BMI) between 19 and 30 kg/m2, inclusive.
* Healthy as determined by pre-study medical history, physical examination, vital signs, complete neurological examination and 12-lead ECG.
* Negative tests for HBsAg, anti-HCVAb and HIV-1 and HIV-2 Ab at screening.
* Clinical laboratory test results clinically acceptable at screening and admission to each treatment period.
* Negative screen for alcohol and drugs of abuse at screening and admission to each treatment period.
* Non-smokers or ex-smokers for at least 3 months.
* (If female) She was not of childbearing potential by reason of surgery or, if of childbearing potential, she used one of the following methods of contraception: double barrier or intrauterine device.
* (If female) She had a negative urine pregnancy test at screening and admission to each treatment period.

Exclusion Criteria:

* Clinically relevant history or presence of respiratory, gastrointestinal, renal, hepatic, haematological, lymphatic, neurological, cardiovascular, psychiatric, musculoskeletal, genitourinary, immunological, dermatological, endocrine, connective tissue diseases or disorders.
* Clinically relevant surgical history.
* Personal or family history of haemostatic disorder.
* Personal or family history of bleeding complications after surgery or tooth extraction, nose or gingival bleeding, or haemorrhagic diathesis.
* Any abnormality in the coagulation tests.
* Any abnormality in the liver function tests.
* A history of relevant atopy or drug hypersensitivity.
* History of alcoholism or drug abuse.
* Consumed more than 14 units of alcohol a week.
* Significant infection or known inflammatory process at screening or admission to each treatment period.
* Acute gastrointestinal symptoms (e.g., nausea, vomiting, diarrhoea, heartburn) at the time of screening or admission to each treatment period.
* Had used medicines within 2 weeks of admission to first period that may have affected the safety or other study assessments, in the investigator's opinion.
* Had previously received BIA 9-1067.
* Had used any investigational drug or participated in any clinical trial within 6 months prior to screening.
* Had participated in more than 2 clinical trials within the 12 months prior to screening.
* Had donated or received any blood or blood products within the 3 months prior to screening.
* Vegetarians, vegans or had medical dietary restrictions.
* Cannot communicate reliably with the investigator.
* Unlikely to co-operate with the requirements of the study.
* Unwilling or unable to gave written informed consent.
* Employees at BIAL - Portela \& Co, SA.
* (If female) She was pregnant or breast-feeding.
* (If female) She was of childbearing potential and she did not used an approved effective contraceptive method (double-barrier or intra-uterine device) or she used oral contraceptives.