A Study of the Safety and Efficacy of Two Doses of Naltrexone SR/Bupropion SR and Placebo in Overweight and Obese Subjects
Condition: Obesity; Overweight
MeSH terms: Overweight
Intervention: Naltrexone SR 16 mg/Bupropion SR 360 mg /day; Naltrexone SR 32 mg/Bupropion SR 360 mg /day; Placebo; Ancillary therapy
Intervention description: Ancillary therapy consisting of diet instruction, advice on behavior modification, and exercise counseling
Intervention MeSH terms: Naltrexone; Bupropion
Phase: Phase 3
Study type: Interventional
Primary purpose: Treatment
Allocation: Randomized
Intervention model: Parallel Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Enrollment: 1742.0
Sex: All
Minimum age: 18 Years
Maximum age: 65 Years
Healthy volunteers: No
Keywords: Obesity; Antiobesity agents; Antiobesity drugs; Overweight drug therapy; Obese drug therapy; Weight loss drug effects; Bupropion administration and dosage; Naltrexone administration and dosage; Double blind method; Combination drug therapy; Delayed action preparations

Summary:

      The purpose of this study is to determine whether 2 doses of the combination of naltrexone SR
      and bupropion SR are safe and effective in the treatment of obesity.
    

Eligibility criteria:

        Inclusion Criteria:

          -  Female and male subjects, 18 to 65 years of age;

          -  Have BMI ≥30 and ≤45kg/m² for subjects with uncomplicated obesity, and BMI of ≥27 and
             ≤45kg/m² for subjects with obesity and controlled hypertension and/or dyslipidemia;

          -  Normotensive (systolic ≤140 mm Hg; diastolic ≤90 mm Hg). Anti-hypertensive medications
             are allowed with the exception of alpha-adrenergic blockers and clonidine; medical
             regimen must be stable for at least 6 weeks prior to randomization;

          -  Medications for treatment of dyslipidemia are allowed as long as medical regimen has
             been stable for at least 6 weeks prior to randomization;

          -  Free of opioid medication for 7 days prior to randomization;

          -  No clinically significant abnormality of serum albumin, blood urea nitrogen,
             creatinine, bilirubin, sodium, potassium, chloride, calcium or phosphorus;

          -  Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) within 2.5 x upper
             limit of normal range (ULN);

          -  No clinically significant abnormality of hematocrit, white blood cell (WBC) count,
             white cell differential, or platelets;

          -  Fasting glucose < 126 mg/dL on no hypoglycemic agents, fasting triglycerides <400
             mg/dL;

          -  No clinically significant abnormality on urinalysis;

          -  TSH within normal limits or normal T3, if TSH is below normal limits;

          -  Negative serum pregnancy test in women of child-bearing potential;

          -  Negative urine drug screen;

          -  IDS-SR scores < 2 on items 5 (sadness), 6 (irritability), 7 (anxiety/tension) and 18
             (suicidality), and IDS-SR total score < 30;

          -  Women of child bearing potential had to be non-lactating and agree to use effective
             contraception throughout the study period and 30 days after discontinuation of study
             drug;

          -  Able to comply with all required study procedures and schedule;

          -  Able to speak and read English;

          -  Willing and able to give written informed consent.

        Exclusion Criteria:

          -  Obesity of known endocrine origin (e.g., untreated hypothyroidism, Cushing's syndrome,
             established Polycystic Ovary Syndrome);

          -  Serious medical conditions (including but not limited to ongoing renal or hepatic
             insufficiency, Class III or IV congestive heart failure; myocardial infarction,
             history of angina pectoris, claudication, or acute limb ischemia within the previous 6
             months; lifetime history of stroke);

          -  History of malignancy within the previous 5 years with exception of non-melanoma skin
             cancer or surgically cured cervical cancer;

          -  A lifetime history of serious psychiatric illness, including lifetime history of
             bipolar disorder, schizophrenia or other psychosis, bulimia, or anorexia nervosa;

          -  Current serious psychiatric illness including severe personality disorder, (e.g.
             borderline or antisocial), current severe major depressive disorder, recent (previous
             6 months) suicide attempt, current active suicidal ideation, or recent hospitalization
             due to psychiatric illness;

          -  A response to bipolar disorder questions indicating the presence of bipolar disorder;

          -  In need of medications for the treatment of a psychiatric disorder (with the exception
             of short-term insomnia) within the previous 6 months prior to randomization;

          -  History of drug or alcohol abuse or dependence (with the exception of nicotine
             dependence) within 1 year prior to study initiation;

          -  Type 1 or Type 2 diabetes mellitus;

          -  Screening ECG with a corrected QT interval by the method of Bazett (QTcB) >450 msec
             (men) and > 470 millisecond (msec) (women) or the presence of any clinically
             significant cardiac abnormalities, including but not limited to patterns consistent
             with myocardial ischemia, electrolyte abnormalities, or atrial or ventricular
             dysrhythmia or significant conduction abnormalities;

          -  Excluded concomitant medications: any psychotropic agents (including antipsychotic,
             antidepressant, anxiolytic, mood stabilizer, anticonvulsant agents or agents for the
             treatment of Attention Deficit Disorder) with the exception of low dose benzodiazepine
             or hypnotic agents for the treatment of insomnia (up to 2 mg lorazepam/day or
             equivalent dose of a benzodiazepine or hypnotic agent); any anorectic or weight loss
             agents; any over-the-counter dietary supplements or herbs with psychoactive, appetite
             or weight effects; alpha-adrenergic blockers; dopamine agonists; clonidine; coumadin;
             theophylline; cimetidine; oral corticosteroids; cholestyramine, cholestypol, Depo
             Provera®; smoking cessation agents; use of opioid or opioid-like medications,
             including analgesics and antitussives;

          -  History of surgical or device (e.g., gastric banding) intervention for obesity;

          -  History of seizures of any etiology, or of predisposition to seizures (e.g., history
             of cerebrovascular accident, head trauma with ≥5 minutes loss of consciousness,
             concussion symptoms lasting ≥15 minutes, brain surgery, skull fracture, subdural
             hematoma, or febrile seizures);

          -  History of treatment with bupropion or naltrexone within the preceding 12 months;

          -  History of hypersensitivity or intolerance to bupropion or naltrexone;

          -  Initiation or discontinuation of tobacco products including inhaled tobacco (such as
             cigarettes, cigars, pipes, etc), chewing tobacco or snuff in the 3 months prior to
             randomization or planned during study participation. Use of nicotine replacement
             products (nicotine gum, patch) during study participation was not allowed;

          -  Use of drugs, herbs, or dietary supplements believed to significantly affect body
             weight or participation in a weight loss management program within one month prior to
             randomization;

          -  Loss or gain of more than 4.0 kilograms within 3 months prior to randomization;

          -  Pregnant or breast-feeding women or planning to become pregnant during the study
             period or within 30 days of discontinuing study drug;

          -  Planned surgical procedure that can impact the conduct of the study;

          -  Use of investigational drug, device or procedure within the previous 30 days;

          -  Participation in any previous clinical trial sponsored by Orexigen Therapeutics;

          -  Any condition which in the opinion of the investigator makes the subject unsuitable
             for inclusion in the study;

          -  Investigators, study personnel, sponsor representatives and their immediate families.