A Phase 1 Bioavailability Study of Arbaclofen Placarbil Modified Release Formulations in Healthy Volunteers

Healthy Volunteers Clinical Trial

Official title:

A Phase 1 Bioavailability Study of Arbaclofen Placarbil Modified Release Formulations in Healthy Volunteers

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03058237
• Other study ID #: INDV-AP-102
• Secondary ID: 2016-003792-22
• Status: Completed
• Phase: Phase 1
• First received: February 9, 2017
• Last updated: January 15, 2018
• Start date: January 24, 2017
• Est. completion date: July 5, 2017

Study information

• Verified date: January 2018
• Source: Indivior Inc.
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Part 1

• To evaluate the pharmacokinetic (PK) profile of Arbaclofen Placarbil (AP) and R-baclofen following dosing of Arbaclofen Placarbil Modified Release (MR) Prototype A Tablet and Arbaclofen Placarbil MR Prototype B Tablet in healthy subjects

• To determine the relative bioavailability of AP and R-baclofen following dosing of Arbaclofen Placarbil MR Prototype A Tablet and Arbaclofen Placarbil MR Prototype B Tablet compared to the reference Arbaclofen Placarbil Sustained Release (SR) Tablets (low dose)

• To determine the relative bioavailability and PK of AP and R-baclofen following dosing of the selected MR prototype formulation(s) in the presence of beverage

• To provide additional information on the safety and tolerability of single doses of AP

Part 2

• To evaluate the PK profile of AP and R-baclofen following dosing of Arbaclofen Placarbil MR Prototype Tablets in healthy subjects

• To determine the relative bioavailability and PK of AP and R-baclofen following dosing of Arbaclofen Placarbil MR Prototype Tablets compared to the reference Arbaclofen Placarbil Immediate Release (IR) Capsule

• To provide additional information on the safety and tolerability of single doses of AP

• To determine the relative bioavailability and PK of AP and R-baclofen following dosing of a selected MR prototype formulation in the fed state (optional)

• To explore a possible in vitro in vivo correlation/relationship (IVIVC/IVIVR) for the Arbaclofen Placarbil MR Prototype Tablet Formulations

Part 3

• To determine the relative bioavailability of the selected Arbaclofen Placarbil MR Prototype Tablet in the presence of either beverage or food and/or

• To evaluate the PK profile (dose proportionality) of AP and R-baclofen following dosing of the selected Arbaclofen Placarbil MR Prototype A + B Tablet at different dose levels in healthy subjects

• To provide additional information on the safety and tolerability of single doses of AP

Description:

For Parts 1, 2 and 3, participants will attend the clinical unit for a screening visit up to 28 days before dosing. For each treatment period, eligible subjects will be admitted to the clinical unit on the evening before dosing (Day -1). Participants will receive each regimen in the morning of Day 1 and will remain on site until 48 h post-dose. There will be a minimum washout period of 7 days between administration of each regimen. Where interim decisions occur, the interval between periods will be sufficient to permit the decision process.

Arbaclofen Placarbil MR Prototype Tablets will be administered in Part 1 and one prototype will be selected for development in Part 2 where the release rate of modified release (MR) prototype formulations will be optimised using a design space concept (at a fixed low dose).

A selected MR prototype formulation from Part 2 may be administered in Part 3 at up to 4 different dose levels (low, mid-low, mid-high, high). The suggested doses in Part 3 may be modified based on emerging safety and PK data from Part 2 of the study.

In Parts 2 and 3, there will be an option to dose selected Arbaclofen Placarbil MR Prototype Tablets in the fed state.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 40
• Est. completion date: July 5, 2017
• Est. primary completion date: July 5, 2017
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 55 Years

Eligibility

Inclusion Criteria:

• Healthy males

• Non-pregnant, non-lactating healthy females

• Body mass index of 18.0 to 30.0 kg/m^2 or, if outside the range, considered not clinically significant by the investigator

• Must be willing and able to communicate and participate in the whole study

• Must provide written informed consent prior to any study-specific procedures

• Must agree to use an adequate method of contraception

Exclusion Criteria:

• Subjects who have received any IMP in a clinical research study within the previous 3 months

• Subjects who are study site employees, or immediate family members of a study site or sponsor employee

• Subjects who have previously been enrolled in this study

• History of any clinically significant drug/substance or alcohol abuse or disorders in the past 2 years

• Regular alcohol consumption in males >21 units per week and females >14 units per week (1 unit = ½ pint beer, 25 mL of 40% spirit or a 125 mL glass of wine)

• Regular alcohol consumption <5 units per week on average

• Current smokers and those who have smoked within the last 12 months. A breath carbon monoxide reading of greater than 10 ppm at screening and each admission

• Current smokers of e-cigarettes and nicotine replacement products and those who have smoked these products within the last 12 months

• Females of childbearing potential who are pregnant or lactating (female subjects must have a negative urine pregnancy test). A woman is considered of childbearing potential unless she is permanently sterile (hysterectomy, bilateral salpingectomy or bilateral oophorectomy) or is postmenopausal (had no menses for 12 months without an alternative medical cause and a serum follicle-stimulating hormone [FSH] concentration =40 IU/L)

• Subjects who do not have suitable veins for multiple venepunctures/cannulation as assessed by the investigator at screening

• Clinically significant abnormal biochemistry, haematology or urinalysis as judged by the investigator

• Clinically significant abnormal ECG as judged by the investigator, including a QT interval corrected using Fridericia's formula of >450 msec in males and >470 msec in females

• Positive drugs of abuse test result at screening and each admission (drugs of abuse tests are listed in the protocol)

• Positive hepatitis B surface antigen (HBsAg), hepatitis C virus antibody (HCV Ab) or human immunodeficiency virus (HIV) results

• Evidence of renal impairment at screening, as indicated by an estimated creatinine clearance of <70 mL/min using the Cockcroft-Gault equation

• History of cardiovascular, renal, hepatic, chronic respiratory or gastrointestinal disease or psychiatric disorder, as judged by the investigator

• History of surgical procedures involving the brain or meninges, encephalitis, meningitis, degenerative central nervous system disorder (eg, Alzheimer's or Parkinson's Disease), epilepsy, mental retardation, or any other disease/procedure/accident/intervention associated with significant injury to or malfunction of the central nervous system, or a history of significant head trauma within the past 2 years, or currently receiving anticonvulsant therapy for any reason

• Serious adverse reaction or serious hypersensitivity to any drug or the formulation excipients

• Presence or history of clinically significant allergy requiring treatment, as judged by the investigator. Hayfever is allowed unless it is active

• Donation or loss of greater than 400 mL of blood within the previous 3 months

• Subjects who are taking, or have taken, any prescribed or over-the-counter drug (other than 4 g per day paracetamol, hormone replacement therapy and hormonal contraceptives) or herbal remedies in the 14 days before IMP administration. Exceptions may apply on a case by case basis, if considered not to interfere with the objectives of the study, as agreed by the PI and sponsor's medical monitor.

• Failure to satisfy the investigator of fitness to participate for any other reason

Related Conditions & MeSH terms

• Healthy Volunteers

Intervention

Drug:
• Arbaclofen Placarbil SR
One low dose oral tablet of Arbaclofen Placarbil sustained release (SR) in the fasted state.
• Arbaclofen Placarbil MR Prototype A
One low dose oral tablet pf Arbaclofen Placarbil modified release (MR) Prototype A in the fasted state; this formulation may also be tested with 0.6 g/kg beverage diluted in orange juice
• Arbaclofen Placarbil MR Prototype B
One low dose oral tablet of Arbaclofen Placarbil modified release (MR) Prototype B; this formulation may also be tested with 0.6 g/kg beverage diluted in orange juice
• Arbaclofen Placarbil IR
One low dose oral capsule of Arbaclofen Placarbil immediate release (IR) in the fasted state.

Locations

Country	Name	City	State
United Kingdom	Quotient Clinical	Ruddington	Nottingham

Sponsors (1)

Lead Sponsor	Collaborator
Indivior Inc.

Country where clinical trial is conducted

United Kingdom, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Part 1: Time to Maximum Concentration (Tmax) of Arbaclofen Placarbil (AP) and R-baclofen in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Maximum Observed Concentration (Cmax) of Arbaclofen Placarbil (AP) and R-baclofen in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Concentrations at 12 Hours Post-dose (C12) of Arbaclofen Placarbil (AP) and R-baclofen in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose at 12 hours
Secondary	Part 1: Concentrations at 24 Hours Post-dose (C24) of Arbaclofen Placarbil (AP) and R-baclofen in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose at 24 hours
Secondary	Part 1: Area under the Concentration vs Time Curve From Time 0 to 12 Hours post-dose (AUC(0-12)) of Arbaclofen Placarbil (AP) and R-baclofen in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 12 hours
Secondary	Part 1: Area under the Concentration vs Time Curve From Time 0 to 24 Hours post-dose (AUC(0-24)) of Arbaclofen Placarbil (AP) and R-baclofen in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 24 hours
Secondary	Part 1: Area under the Concentration vs Time Curve From Time 0 to Last Measurable Concentration (AUC(0-last)) of Arbaclofen Placarbil (AP) and R-baclofen in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Area under the Concentration vs Time Curve From Time 0 Extrapolated to Infinity (AUC(0-inf)) of Arbaclofen Placarbil (AP) and R-baclofen in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Percentage of AUC(0-inf) Extrapolated Beyond Last Measured Time Point (AUC%extrap) of Arbaclofen Placarbil (AP) and R-baclofen in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: AP:R-baclofen AUC Ratios in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: AP:R-baclofen Cmax Ratios in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: The Slope of the Apparent Elimination Phase (lambda-z) in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: The Apparent Elimination Half-life (T1/2) in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: The Apparent Volume of Plasma Cleared of AP and R-baclofen per Unit Time Following Extravascular Dosing in Low Dose Arbaclofen Placarbil Modified Release (MR) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in low dose arbaclofen placarbil modified release (MR) prototypes A and B.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Relative Bioavailability of AP and R-baclofen following administration of Arbaclofen Placarbil Modified Release (MR) Prototypes A + B Compared to Reference Arbaclofen Placarbil Sustained Release (SR)	The relative bioavailability of AP and R-baclofen following administration of arbaclofen placarbil modified release (MR) prototypes A + B compared to reference AP sustained release (SR), by calculation of Frel (relative bioavailability).	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Time to Maximum Concentration (Tmax) of AP and R-baclofen in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Maximum Observed Concentration (Cmax) of AP and R-baclofen in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Concentrations at 12 Hours Post-dose (C12) of AP and R-baclofen in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose at 12 hours
Secondary	Part 1: Concentrations at 24 Hours Post-dose (C24) of AP and R-baclofen in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose at 24 hours
Secondary	Part 1: Area under the Concentration vs Time Curve From Time 0 to 12 Hours post-dose (AUC(0-12)) of AP and R-baclofen in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 12 hours
Secondary	Part 1: Area under the Concentration vs Time Curve From Time 0 to 24 Hours post-dose (AUC(0-24)) of AP and R-baclofen in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 24 hours
Secondary	Part 1: Area under the Concentration vs Time Curve From Time 0 to Last Measurable Concentration (AUC(0-last)) of AP and R-baclofen in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Area under the Concentration vs Time Curve From Time 0 Extrapolated to Infinity (AUC(0-inf)) of AP and R-baclofen in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Percentage of AUC(0-inf) Extrapolated Beyond Last Measured Time Point (AUC%extrap) of AP and R-baclofen in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: AP:R-baclofen AUC Ratios in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: AP:R-baclofen Cmax Ratios in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: The Slope of the Apparent Elimination Phase (lambda-z) in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: The Apparent Elimination Half-life (T1/2) in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: The Apparent Volume of Plasma Cleared of AP and R-baclofen per Unit Time Following Extravascular Dosing in Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected MR prototype formulation(s) in the presence of beverage compared to when dosed with water only.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 1: Relative Bioavailability of AP and R-baclofen Following Administration of Selected MR Prototype Formulation(s) When Taken with Beverage Compared to Taken With Water	Relative Bioavailability of AP and R-baclofen following administration of selected MR prototype formulation(s) when taken with beverage compared to taken with water, calculated by Frel.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Time to Maximum Concentration (Tmax) of AP and R-baclofen in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low-dose MR prototype formulation(s).	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Maximum Observed Concentration (Cmax) of Arbaclofen Placarbil (AP) and R-baclofen in in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Concentrations at 12 Hours Post-dose (C12) of Arbaclofen Placarbil (AP) and R-baclofen in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose at 12 hours
Secondary	Part 2: Concentrations at 24 Hours Post-dose (C24) of Arbaclofen Placarbil (AP) and R-baclofen in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s) Prototypes A + B	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose at 24 hours
Secondary	Part 2: Area under the Concentration vs Time Curve From Time 0 to 12 Hours post-dose (AUC(0-12)) of Arbaclofen Placarbil (AP) and R-baclofen in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 12 hours
Secondary	Part 2: Area under the Concentration vs Time Curve From Time 0 to 24 Hours post-dose (AUC(0-24)) of Arbaclofen Placarbil (AP) and R-baclofen in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 24 hours
Secondary	Part 2: Area under the Concentration vs Time Curve From Time 0 to Last Measurable Concentration (AUC(0-last)) of Arbaclofen Placarbil (AP) and R-baclofen in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Area under the Concentration vs Time Curve From Time 0 Extrapolated to Infinity (AUC(0-inf)) of Arbaclofen Placarbil (AP) and R-baclofen in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Percentage of AUC(0-inf) Extrapolated Beyond Last Measured Time Point (AUC%extrap) of Arbaclofen Placarbil (AP) and R-baclofen in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: AP:R-baclofen AUC Ratios in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: AP:R-baclofen Cmax Ratios in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: The Slope of the Apparent Elimination Phase (lambda-z) in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: The Apparent Elimination Half-life (T1/2) in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: The Apparent Volume of Plasma Cleared of AP and R-baclofen per Unit Time Following Extravascular Dosing in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype(s)	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototypes.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Relative Bioavailability of AP and R-baclofen following administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototypes Compared to Reference Arbaclofen Placarbil Immediate Release (IR)	The relative bioavailability of AP and R-baclofen following administration of selected arbaclofen placarbil modified release (MR) Prototypes A + B compared to reference AP immediate release (IR), by calculation of Frel (relative bioavailability).	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Relative Bioavailability of AP and R-baclofen Following Administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	The relative bioavailability of AP and R-baclofen following administration of Arbaclofen Placarbil Modified Release (MR) Prototype in a fed state compared to a fasted state, by calculation of Frel (relative bioavailability).	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Time to Maximum Concentration (Tmax) of AP and R-baclofen Following Administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Maximum Observed Concentration (Cmax) of AP and R-baclofen Following Administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Concentrations at 12 Hours Post-dose (C12) of AP and R-baclofen Following Administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose at 12 hours
Secondary	Part 2: Concentrations at 24 Hours Post-dose (C24) of AP and R-baclofen Following Administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose at 24 hours
Secondary	Part 2: Area under the Concentration vs Time Curve From Time 0 to 12 Hours post-dose (AUC(0-12)) of AP and R-baclofen Following Administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 12 hours
Secondary	Part 2: Area under the Concentration vs Time Curve From Time 0 to 24 Hours post-dose (AUC(0-24)) of AP and R-baclofen Following Administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 24 hours
Secondary	Part 2: Area under the Concentration vs Time Curve From Time 0 to Last Measurable Concentration (AUC(0-last)) of AP and R-baclofen Following Administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Area under the Concentration vs Time Curve From Time 0 Extrapolated to Infinity (AUC(0-inf)) of AP and R-baclofen Following Administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: Percentage of AUC(0-inf) Extrapolated Beyond Last Measured Time Point (AUC%extrap) of AP and R-baclofen Following Administration of Selected Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: AP:R-baclofen AUC Ratios in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	The relative bioavailability of AP and R-baclofen following administration of Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: AP:R-baclofen Cmax Ratios in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: The Slope of the Apparent Elimination Phase (lambda-z) in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: The Apparent Elimination Half-life (T1/2) in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 2: The Apparent Volume of Plasma Cleared of AP and R-baclofen per Unit Time Following Extravascular Dosing in Selected Low Dose Arbaclofen Placarbil Modified Release (MR) Prototype in Both a Fed and Fasted State	Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in selected low dose arbaclofen placarbil modified release (MR) prototype administered in a fed state compared to a fasted state.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: Relative Bioavailability of AP and R-baclofen in a Selected MR Prototype Formulation in the Fed State Compared to Fasted State	An optional outcome dependent upon decision-making in response to interim PK observations. This outcome reports the relative bioavailability of AP and R-baclofen in a selected MR prototype formulation in the fed state compared to fasted, by calculation of Frel. An alternative is to compare the bioavailability of AP and R-baclofen when taken with beverage compared to taken with water, calculated by Frel.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: Time to Maximum Concentration (Tmax) of AP and R-baclofen in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: Maximum Observed Concentration (Cmax) of AP and R-baclofen in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: Concentrations at 12 Hours Post-dose (C12) of AP and R-baclofen in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose at 12 hours
Secondary	Part 3: Concentrations at 24 Hours Post-dose (C24) of AP and R-baclofen in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose at 24 hours
Secondary	Part 3: Area under the Concentration vs Time Curve From Time 0 to 12 Hours post-dose (AUC(0-12)) of AP and R-baclofen in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 12 hours
Secondary	Part 3: Area under the Concentration vs Time Curve From Time 0 to 24 Hours post-dose (AUC(0-24)) of AP and R-baclofen in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 24 hours
Secondary	Part 3: Area under the Concentration vs Time Curve From Time 0 to Last Measurable Concentration (AUC(0-last)) of AP and R-baclofen in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: Area under the Concentration vs Time Curve From Time 0 Extrapolated to Infinity (AUC(0-inf)) of AP and R-baclofen in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: Percentage of AUC(0-inf) Extrapolated Beyond Last Measured Time Point (AUC%extrap) of AP and R-baclofen in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: AP:R-baclofen AUC Ratios in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: AP:R-baclofen Cmax Ratios in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: The Slope of the Apparent Elimination Phase (lambda-z) in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: The Apparent Elimination Half-life (T1/2) in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Part 3: The Apparent Volume of Plasma Cleared of AP and R-baclofen per Unit Time Following Extravascular Dosing in a Selected MR Prototype Formulation at Different Dose Levels	An optional outcome dependent upon decision-making in response to interim PK observations. Part of the pharmacokinetic profile of arbaclofen placarbil (AP) and R-baclofen in a selected MR prototype formulation at different dose levels.	Day 1 (pre-dose), post-dose up to 48 hours
Secondary	Parts 1, 2 and 3: Participants with Adverse Events	The number of participants in categories of treatment-emergent adverse events.	Days 1-2 of each regimen