Study Evaluating the Abuse Potential of NEURONTIN® in Healthy Non-drug Dependent, Recreational Opioid Users

Inclusion Criteria

• Male and female participants must be 18 to 55 years of age, inclusive, at the time of screening. Participants must meet reproductive criteria as outlined in the protocol.
• Male and female participants who are overtly healthy. Healthy is defined as no clinically relevant abnormalities identified by a detailed medical history, complete physical examination, vital signs, 12-lead ECG, and/or clinical laboratory tests.
• Participants must have drug abuse experience with opioids; ie, must have used opioids for non-therapeutic purposes (ie, for psychoactive effects) on at least 10 occasions within the last year and at least once in the 8 weeks before the Screening Visit (Visit 1).
• Participants must satisfactorily complete both the Naloxone Challenge and the Drug Discrimination.
• Participants who are willing and able to comply with all scheduled visits, treatment plan, laboratory tests, lifestyle considerations, and other study procedures.
• Body mass index (BMI) of 17.5 to 34 kg/m2, inclusive; and a total body weight ≥50 kg (110 lb).
• Capable of giving signed informed consent as described in the protocol, which includes compliance with the requirements and restrictions listed in the informed consent document (ICD) and in this protocol.

Exclusion Criteria

• Current or past diagnosis of any type of drug dependence within the past year. Diagnosis of substance and/or alcohol dependence (excluding caffeine and nicotine) will be assessed by the Investigator using the Diagnostic and Statistical Manual of Mental Disorders-IV (DSM-IV) criteria performed at Screening. Current drug use will be allowed if the candidate can produce a negative urine sample and are free of any signs/symptoms of withdrawal. The candidate will be informed if they have a positive breathalyzer test.
• Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurological, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at the time of dosing).
• Any condition possibly affecting drug absorption (eg, gastrectomy) excluding cholecystectomy within 1 year prior to study.
• Abnormal baseline EtCO2 45 mm Hg.
• Clinical or laboratory evidence of active hepatitis A infection or a history of human immunodeficiency virus (HIV) infection, hepatitis B, or hepatitis C, and/or positive testing for HIV, hepatitis B surface antigen (HBsAg), hepatitis B core antibody (HBcAb), or hepatitis C antibody (HCVAb).
• Participants with active suicidal ideation or suicidal behavior within 5 years prior to Screening as determined through the use of the Columbia Suicide Severity Rating Scale (C-SSRS) or active ideation identified at Screening or on Day 0.
• Participants with any history of sleep apnea, myasthenia gravis or glaucoma.
• Other acute or chronic medical or psychiatric condition including recent (within the past year) or active suicidal ideation or behavior or laboratory abnormality that may increase the risk associated with study participation or investigational product administration or may interfere with the interpretation of study results and, in the judgment of the investigator, would make the participant inappropriate for entry into this study.
• Use of prescription or nonprescription drugs and dietary supplements within 7 days or 5 half lives (whichever is longer) prior to the first dose of investigational product. (Refer to Section 6.5 for additional details).
• Herbal supplements, herbal medications and hormone replacement therapy must be discontinued at least 28 days prior to the first dose of study medication.
• Previous administration with an investigational drug within 30 days (or as determined by the local requirement) or 5 half lives (whichever is longer) preceding the first dose of investigational product used in this study.
• Positive urine drug screen (UDS) for substances of