Effect of BIA 6-512 at Steady-state on the Levodopa Pharmacokinetics With a Single-dose of Levodopa/Benserazide 200/50 mg or With a Single-dose of Levodopa/Benserazide 200/50 mg Plus a Single-dose of Nebicapone 150 mg
Effect of BIA 6-512 at Steady-state on the Levodopa Pharmacokinetics With a Single-dose of Levodopa/Benserazide 200/50 mg or With a Single-dose of Levodopa/Benserazide 200/50 mg Plus a Single-dose of Nebicapone 150 mg
The purpose of this study was to determine whether the administration of BIA 6-512 (25 mg, 50
 mg, 75 mg and 100 mg) at steady-state affects the pharmacokinetics of levodopa when
 administered in combination with a single-dose of immediate release levodopa/benserazide
 200/50 mg or with a single-dose of immediate release levodopa/benserazide 200/50 mg plus a
 single-dose of nebicapone 150 mg.
Single centre, double-blind, randomised, placebo-controlled, rising multiple dose study in
 four sequential groups of healthy male and female subjects. Eligible subjects were admitted
 to the Human Pharmacology Unit (UFH)on the day prior to receiving the first study medication.
 Starting in the morning of Day 1 (first dose), subjects received BIA 6-512/Placebo thrice
 daily until the morning of Day 5 (last dose). Concomitantly with the morning dose of BIA
 6-512/Placebo on Day 4, a levodopa/benserazide 200/50 mg (Madopar® 250) single-dose was
 administered. On Day 5, a Madopar® 250 single-dose and a nebicapone 150 mg single-dose were
 administered concomitantly with the morning dose of BIA 6-512/Placebo. In the morning of Day
 4 and Day 5, products were administered in fasting conditions of at least 8 hours and
 subjects remained fasted until 2 h post-dose. Subjects were resident in the UFH from
 admission (Day 0) until at least 24 h post last dose (Day 6); then, they were discharged and
 returned for the follow-up visit.
Inclusion Criteria:

 -  Male or female subjects aged between 18 and 45 years, inclusive.

 -  Subjects of body mass index (BMI) between 19 and 30 kg/m2, inclusive.

 -  Subjects who were healthy as determined by pre-study medical history, physical
 examination, vital signs, complete neurological examination and 12-lead ECG.

 -  Subjects who had negative tests for HBsAg, anti-HCVAb and HIV-1 and HIV-2 Ab at
 screening

 -  Subjects who had clinical laboratory test results clinically acceptable at screening
 and admission.

 -  Subjects who had a negative screen for alcohol and drugs of abuse at screening and
 admission.

 -  Subjects who were non-smokers or who smoked ≤ 10 cigarettes or equivalent per day.

 -  Subjects who were able and willing to gave written informed consent.

 -  (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, intrauterine device or abstinence.

 -  (If female) She had a negative urine pregnancy test at screening and admission.

 Exclusion Criteria:

 -  Subjects who had a 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.

 -  Subjects who had a clinically relevant surgical history.

 -  Subjects who had a clinically relevant family history.

 -  Subjects who had a history of relevant atopy.

 -  Subjects who had a history of relevant drug hypersensitivity.

 -  Subjects who had a history of alcoholism or drug abuse.

 -  Subjects who consumed more than 14 units of alcohol a week.

 -  Subjects who had a significant infection or known inflammatory process on screening or
 admission.

 -  Subjects who had acute gastrointestinal symptoms (e.g., nausea, vomiting, diarrhoea,
 heartburn) at the time of screening or admission.

 -  Subjects who had used medicines within 2 weeks of admission that may affect the safety
 or other study assessments, in the investigator's opinion.

 -  Subjects who had previously participated in a clinical trial with BIA 6-512.

 -  Subjects who had used any investigational drug or participated in any clinical trial
 within 6 months prior to screening.

 -  Subjects who had participated in more than 2 clinical trials within the 12 months
 prior to screening.

 -  Subjects who had donated or received any blood or blood products within the 3 months
 prior to screening.

 -  Subjects who were vegetarians, vegans or have medical dietary restrictions.

 -  Subjects who cannot communicate reliably with the investigator.

 -  Subjects who were unlikely to co-operate with the requirements of the study.

 -  Subjects who were unwilling or unable to give written informed consent.

 -  (If female) She was pregnant or breast-feeding.

 -  (If female) She was of childbearing potential and she did not use an effective
 contraceptive method (double-barrier, intra-uterine device or abstinence) or she used
 oral contraceptives.