The trial was an experimental two-centers, randomized, double-blind, two-sequence, non-inferiority cross-over study.

Screened subjects already treated with Levodopa/Benserazide (LDB) (Madopar®) who agreed to participate in the study entered a 4 weeks period if not on stable regimen of Madopar® (run-in period). Following the run-in period, there were two maintenance periods of 4 weeks each, for a total duration of 8 weeks.

Patients were assigned randomly (1:1) by a computerized randomization system to one of two formulation sequences maintaining the dose stabilized during the run in:

• generic-originator
• originator-generic At the end of maintenance period 1, the patients in each formulation group underwent an overnight switch to the same dose of the alternative formulation. The dose was kept stable during the whole length of trial. Clinical evaluations were performed at the end of each period. The tablets were encapsulated to maintain the blindness.

A pharmacokinetic study with a fixed dose (100+25 mg) was performed in a sub-population of 14 subjects.

Population: out-patients with a diagnosis of idiopathic Parkinson's disease for at least 5 years, receiving L-dopa/benserazide.

The total duration of the trial was approximately 8 weeks for patient divided in two maintenance periods of 4 weeks each.

The trial was an experimental two-centers, randomized, double-blind, two-sequence, non-inferiority cross-over study.

Population: out-patients with a diagnosis of idiopathic Parkinson's disease (PD) for at least 5 years, receiving Levodopa, were enrolled to participate into the study. The study was performed in hospital setting using the facilities of the clinical trial centre in both sites involved in the study. The patients were recruited within the patient population using the hospitals out-patients clinics. Recruitment timing lasted 18 months.

Screened subjects who agreed to participate in the study, taking Levodopa/Benserazide LDB (Madopar®) entered a 4 weeks period with stable regimen of Madopar® (run-in period). The formulations of levodopa admitted in the trial were: Madopar® 100+25; and 200+50 (1/2 or 1 tablet). Following the run-in period, there were two key phases of the study: two maintenance periods (4 weeks each), for a total duration of 8 weeks. Patients were assigned randomly (1:1) by a computerized randomization system to one of two formulation sequences maintaining the dose stabilized during the run in:

• generic-originator
• originator-generic At the end of maintenance period 1, the patients in each formulation group underwent an overnight switching to the same dose of the alternative formulation. The dose was kept stable during the whole length of trial. Clinical evaluations were performed at the end of each period (see flow chart enclosed). The tablets were encapsulated to maintain the blindness. A pharmacokinetic study with a fixed dose (100+25 mg) was performed in a sub-population of 14 subjects. The drugs was administered orally. In case of prolonged, not tolerable akinetic periods during the study, the patients could be rescued with an extra dose of levodopa. Any antiparkinsonian treatment modification or supplementation of antiparkinsonian drugs was not allowed during the study. Any other drug not specific for Parkinson's disease was evaluated by the investigators and allowed only if necessary and if not interfering with the study drugs.

The random allocation of patients to one of the two treatment groups was centrally managed by the coordinating centre, according to an automatically generated randomization list provided by the team responsible for the data collection monitoring and statistical analysis. An allocation ratio of 1:1 was assumed when generating the list. Patients eligible to enter the randomization procedure was sequentially assigned to the lowest randomization sequence number not yet assigned to any study subject. For each randomization number, a sealed envelope containing the randomization code was prepared by the team that generated the randomization list. Unblinding was permitted only if strictly necessary. In case it was essential to know the treatment assigned to a patient due to serious unexpected adverse events, the envelope containing the patient's randomization code could be open. In such cases, a detailed report on the timing, the causes and the patient's randomization number would have been issued by the person responsible for the trial and archived by the coordinating centre.

Mechanical blinding (encapsulation) was used to ensure the double-blind nature of the study. Because the patients enrolled in the trial received levodopa/benserazide in different doses, over-encapsulation of tablets permitted blinding of most oral dosage forms: ½ tablet, several small tablets, capsules of different sizes or colors. Each capsule was then be placed in a narrow opaque tube and identified as "Treatment 1" and "Treatment 2" before administration to the patient. The patient, the investigator, Medical Monitor and Clinical Monitor remained blinded, whereas the site pharmacist and a nurse who administered study medication were not blind throughout this part of the study.

No interim analysis was planned for this protocol. Amendments: no amendments were presented during the study.

Inclusion Criteria

Out-patients with a diagnosis of idiopathic Parkinson's disease for at least 5 years, receiving L-dopa/benserazide, were enrolled to participate into the study. The patients were recruited within the patient population using the hospitals out-patients clinics.

• Subject must be ≥30 and ≤75 years of age, of either sex and of any race.
• Diagnosis of Parkinson's disease
• Subjects in Hoehn and Yahr stages 2 to 4.
• Subject must have good response to levodopa (≥30% improvement in the UPDRS score).
• Subject must have been on a stable regimen of L-dopa for at least 4 month before Screening.
• A female subject must be postmenopausal, or sterile or use a medically accepted method of contraception.

Fragile population was included in the trial (Elderly 65-74 years and over 75 years).

Exclusion Criteria

• Atypical Parkinsonism
• Subjects with very severe motor fluctuations and/or dyskinesias.
• Significant internal-medicine or psychiatric diseases.
• Subject's clinical laboratory tests outside the normal ranges.
• History of previous rhabdomyolysis
• Subjects in therapy with Catechol-O-methyltransferase-inhibitor.
• Subjects who participated in any other clinical trial in the 4 months before the screening.
• Any subject who is pregnant or breastfeeding.
• Subjects demented or not able to give informed consent to trial