Eligibility Criteria:
Inclusion Criteria:
* Male or female aged 18 to 55 years, inclusive at time of Screening
* Body mass index (BMI) between 18.5 and 28.0 kg/m2 inclusive, with a minimum weight of 50 kg and a maximum of 100 kg
* Healthy as determined by pre-study medical history, physical examination, vital signs, complete neurological examination, and 12-lead ECG confirming normal sinus rhythm
* Negative tests for Hepatitis B surface antigen (HbsAg), hepatitis C virus antibody (anti-HCV), human immunodeficiency virus (HIV)-1 and HIV-2 antibody at Screening
* Routine clinical laboratory tests should be within normal limits at Screening and Admission (Day -1) or abnormalities deemed not clinically significant by the Investigator; for liver function tests, AST and ALT values should not be greater than 1.5 times the upper limit of normal range
* Negative screen for drugs of abuse or exhibit detectable alcohol levels by breathalyzer at the time of Screening or Admission
* Non-smokers or ex-smokers (must have ceased smoking ≥3 months prior Screening visit)
Female subjects:
* Must be of non-childbearing potential by surgical sterilization or postmenopausal OR Must not be pregnant, breast feeding, or planning to become pregnant AND must be practicing both a highly effective method of birth control from Screening until at least 90 days after the last dose of study drug.
* Women of childbearing potential must have a negative pregnancy test result at Screening and upon admission to the Clinical Trial Unit.
Exclusion Criteria:
* Has a clinically relevant history or presence of respiratory, gastrointestinal, renal, hepatic, lymphatic, neurological, cardiovascular, psychiatric, musculoskeletal, genitourinary, immunological, dermatological, endocrine, connective tissue diseases or disorders
* Has a history of severe drug allergy, or severe hypersensitivity or severe food allergy, including anaphylaxis or known allergy or sensitivity to any component of PGB or APAP
* Has a history of alcoholism or drug abuse
* Has acute gastrointestinal symptoms (e.g., nausea, vomiting, diarrhea) at the time of Screening or Admission
* Consumption of drugs with enzyme-inducing properties, within 3 weeks prior to the initial dose of study drug and throughout the treatment phase
* Has used any prescription medicines, over the counter medicines, or herbal supplements, within 7 days of dosing
* Has used any investigational product or participated in any clinical trial within 30 days prior to Screening
* Has donated or received any blood or blood products within the 3 months prior to Screening;
* Not able to comply with the requirements of this study, including assessments, duration of admission of the study and expected follow up visits
* Is unwilling or unable to give written informed consent