Study of BIA 9-1067 to Investigate Its Effect on Levodopa Pharmacokinetic

To investigate the effect of repeated dosing of BIA 9-1067 on the levodopa pharmacokinetics, in comparison to placebo and entacapone.

Single-centre, double-blind, randomised, parallel-group study in 80 young male and female healthy subjects.

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 the treatment period.
* Negative screen for alcohol and drugs of abuse at screening and admission to the 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: intrauterine device (by the subject) and condoms (by the partner) or diaphragm (by the subject) and condoms (by the partner) or spermicide (by the subject) and condoms (by the partner).
* (If female) She had a negative urine pregnancy test at screening and admission to the 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.
* Any abnormality in the coagulation tests.
* Any abnormality in the liver function tests.
* A history of relevant atopy or drug hypersensitivity.
* A history or presence of narrow-angle glaucoma.
* A suspicious undiagnosed skin lesions or a history of melanoma.
* 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 the treatment period.
* Acute gastrointestinal symptoms (e.g., nausea, vomiting, diarrhoea, heartburn) at the time of screening or admission to the treatment period.
* Had used non-selective monoamine oxidase (MAO) inhibitors within 2 weeks of admission to the treatment period.
* Had used medicines within 2 weeks of admission to the treatment 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.
* (If female) She was pregnant or breast-feeding.
* (If female) She was of childbearing potential and she did not use an approved effective contraceptive method or she used oral contraceptives.