Naltrexone and Varenicline: Weight Gain and Tolerability in Smokers
试验速览
- 阶段
- 1 期
- 状态
- 已完成
- 入组人数
- 40
- 试验地点
- 1
- 主要终点
- Weight Gain in Treatment Completers
研究概览
简要总结
The purpose of this study is to determine whether the combination of naltrexone (Depade) and varenicline (Chantix) minimizes post-smoking cessation weight gain and how well the combination is tolerated.
详细描述
Varenicline, a medication recently approved by the FDA, results in smoking cessation rates as high as 50%, significantly better than bupropion or placebo. However, varenicline does not reduce post-cessation weight gain, so weight concerns may keep some smokers from taking advantage of this effective therapy.
A potential solution would be to combine varenicline with an agent that reduces weight gain. In this regard, several studies have shown that naltrexone reduces weight gain (O'Malley et al., 2006; Toll et al., 2007).
This effect appears to be dose dependent, favoring lower doses (i.e., 25 mg daily). Thus, the proposed study seeks to conduct a pilot clinical trial of low dose naltrexone (25 mg daily) compared to placebo for minimizing weight gain in combination with varenicline for smoking cessation. Forty individuals who smoke at least 10 cigarettes per day will receive open-label varenicline for 12 weeks according to the recommended titration schedule up to 1 mg varenicline twice daily. Subjects will be randomized to receive either placebo or 25 mg naltrexone daily, with treatment starting at the quit date (after 1 week on varenicline to minimize nausea, a side effect of both varenicline and naltrexone) and continuing for 11 weeks. Subjects will take 12.5 mg naltrexone daily for the first week and 25 mg naltrexone daily for the next 10 weeks of treatment. In an effort to uncover mechanisms for naltrexone's weight suppressant effects, an experiment will be conducted using food odors and food consumption to examine naltrexone's effects on palatability, incentive value, and alliesthesia.
This experiment will be conducted pretreatment and after 2 weeks on naltrexone. The primary aim of this pilot study is to examine weight gain in participants who complete the clinical trial treatment. Weight gain for those who are continuously abstinent for the last 4 weeks of treatment and rates of adverse events will be secondary outcomes. The effects of naltrexone on odor/food palatability, incentive value, and alliesthesia will be exploratory outcomes. Effect size estimates for weight gain will be generated for a NIH grant application.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Triple (Participant, Care Provider, Investigator)
入排标准
- 年龄范围
- 18 Years 至 75 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Between the ages of 18 and 75
- •Smoking 10 or more cigarettes per day
- •Fewer than 3 months of smoking abstinence in the past year
- •Motivated to stop smoking
排除标准
- •Current use of opiates, and/or a urine toxicology screen positive for opiates
- •Chronic pain conditions necessitating opioid treatment (naltrexone, an opioid antagonist will make these medications ineffective)
- •Evidence of significant hepatocellular injury as evidence by AST or ALT >3 x normal or elevated bilirubin
- •History of cirrhosis
- •Any serious or unstable disease within 6 months
- •Seizure risk
- •Diabetes mellitus requiring insulin or oral hypoglycemic medications
- •Hepatic or renal impairment
- •Use of a monoamine oxidase inhibitor in the prior 14 days
- •Clinically significant cardiovascular disease within 6 months
- •Uncontrolled hypertension
- •Baseline systolic blood pressure higher than 150 mm Hg or diastolic blood pressure higher than 95 mm Hg
- •Severe chronic obstructive pulmonary disease
- •History of cancer (except treated basal cell or squamous cell carcinoma of the skin)
- •History of clinically significant allergic reactions
- •Major depressive disorder within the past year requiring treatment
- •History of or current panic disorder, psychosis, bipolar disorder, or eating disorders
- •Alcohol or drug abuse/dependency within the past year
- •Use of another investigational drug within 30 days
- •Intention to donate blood or blood products during the treatment phase of the study
- •Use of tobacco products other than cigarettes or use of marijuana
- •Use of nicotine replacement therapy, clonidine, varenicline, bupropion, or nortriptyline within the month prior to enrollment or intention to use medication that might interfere with study medication
- •Body Mass Index (calculated as weight in kilograms divided by the square of height in meters) less than 15 or greater than 38 or weight less than 45 kg.
- •Females of childbearing potential who are pregnant, nursing, or not practicing effective contraception (oral injectable, or implantable contraceptives, intrauterine device, or barrier method with spermacide)
研究组 & 干预措施
1
Arm 1 (Experimental) = Varenicline (Chantix) 1 mg oral tablet twice per day + naltrexone 25 mg oral capsule once per day
干预措施: Naltrexone (Drug)
1
Arm 1 (Experimental) = Varenicline (Chantix) 1 mg oral tablet twice per day + naltrexone 25 mg oral capsule once per day
干预措施: Varenicline (Drug)
2
Arm 2 (Placebo Comparator) = Varenicline (Chantix) 1 mg oral tablet twice per day + placebo naltrexone 25 mg oral capsule once per day
干预措施: Varenicline (Drug)
结局指标
主要结局
Weight Gain in Treatment Completers
时间窗: baseline and 12 weeks
次要结局
- Tolerability of the Combination of 25 mg Naltrexone and 2 mg Varenicline(11 weeks)
- Weight Gain in Participants Who Are Continuously Abstinent for the Last 4 Weeks of Treatment(4 weeks)