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S-Adenosyl-L-Methionine (SAMe) for Smoking Abstinence

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00722124
Recruitment Status : Completed
First Posted : July 25, 2008
Results First Posted : September 9, 2011
Last Update Posted : September 9, 2011
Pharmavite LLC
Information provided by:
Mayo Clinic

Brief Summary:

Cigarette smoking is of great public health importance and is the single most important preventable cause of morbidity, mortality and excess health care costs in the United States. After a steady decline for the last 50 years, the prevalence of tobacco use in the United States has reached a plateau of approximately 21%. Currently available treatments among adults are not efficacious for all tobacco users. New pharmacologic agents thus need to be continually developed and tested.

The release of dopamine in the nucleus accumbens is one of the key components of the pleasurable and rewarding effects of nicotine. Drugs that increase monoamine neurotransmitter availability (particularly dopamine and norepinephrine) are likely to increase the reward function and thus ameliorate withdrawal symptoms. S-Adenosyl-L-Methionine (SAMe), the primary methyl donor for the central nervous system (CNS), donates methyl groups towards presynaptic synthesis of CNS monoamine neurotransmitters. By facilitating the synthesis of dopamine and norepinephrine in the brain, SAMe is likely to ameliorate the symptoms of nicotine withdrawal, thus improving tobacco abstinence rates in smokers who are trying to stop smoking. SAMe is well tolerated and is available over-the-counter.

To date, no prospective clinical trial evaluating the efficacy of SAMe for the treatment of tobacco dependence has been published. We propose to evaluate the efficacy of SAMe for increasing smoking abstinence and decreasing nicotine withdrawal symptoms in a randomized, blinded, placebo-controlled, three-arm, parallel-group, dose-ranging phase II clinical trial. Participants (N=120) will be randomly assigned to one of the three groups, and will receive an 8-week course of SAMe 800-mg per day, 1600-mg per day, or a matching placebo. This study is anticipated to provide the data needed to develop a larger randomized controlled clinical trial submitted through the R01 funding mechanism, if the results appear promising.

Condition or disease Intervention/treatment Phase
Tobacco Dependence Drug: S-Adenosyl-L-Methionine Other: placebo Phase 2 Phase 3

Detailed Description:
In this study, after consenting, subject is screened for study eligibility. If they pass the study screen, they are randomized to study drug (800 mg/day of SAMe, 1600 mg/day of SAMe or placebo-look-alike). Subjects will stay on their assigned dose for 8 weeks with weekly (visits 3-6) or biweekly (visits 7-8) clinic visits. After the 8 weeks of medication, they will receive a phone visit at week 16 and then a final visit at week 24. Study participation ends at the week 24 visit. During study participation, subjects will undergo counseling at every study visit based on the counseling manual, Smoke Free and Living It. They will also keep diaries (record of daily withdraw symptoms and tobacco use) for the 8 weeks while on study medication. At each study visit, smoking and safety outcomes are measured.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 150 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: S-Adenosyl-L-Methionine (SAMe) for Smoking Abstinence
Study Start Date : September 2008
Actual Primary Completion Date : December 2009
Actual Study Completion Date : June 2010

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Smoking

Arm Intervention/treatment
Active Comparator: SAMe 800
Each subject randomized to this arm will take a 400 mg pill of SAMe and one matching placebo pill in the AM and again in the PM
Drug: S-Adenosyl-L-Methionine
800 mg dose per day for 8 weeks
Other Name: SAMe

Active Comparator: SAMe 1600
Each person randomized to this arm will take 2 400 mg pills of SAMe in the AM and again in the PM
Drug: S-Adenosyl-L-Methionine
1600 mg per day for 8 weeks
Other Name: SAMe

Placebo Comparator: Placebo
Each subject randomized to this arm will take 2 placebo pills in the AM and again in the PM
Other: placebo
4 pills (2 in the AM and 2 in the PM) of placebos for 8 weeks
Other Name: sugar pill

Primary Outcome Measures :
  1. 7-day Point Prevalence Smoking Abstinence at End of Treatment (Week 8) [ Time Frame: 8 weeks ]
    7-day point prevalence smoking abstinence biochemically confirmed (expired carbon monoxide <8ppm)

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Is at least 18 years of age;
  • Has smoked more than 10 cigarettes/day for ≥6 months;
  • Is willing to make a quit attempt;
  • Is able to participate fully in all aspects of the study;
  • Has been provided with, understand, and have signed the informed consent.
  • Is in good health as determined by the physician investigator.

Exclusion Criteria:

  • Is clinically significant levels of current depression as assessed by CESD (Score >16) and determined by the physician; or have a life-time diagnosis of bipolar disorder, schizophrenia or dementia as determined by physician investigator;
  • Has an unstable medical condition.
  • Is using other tobacco product and the primary use is NOT cigarettes.
  • Is currently (within the past 30-days) using antipsychotics or antidepressants;
  • Is currently (within the past 30-days) using any treatments for tobacco dependence (i.e., behavioral therapy, nicotine replacement therapy, bupropion SR, clonidine, or nortriptyline);
  • Is currently using another investigational drug at the time of study enrollment;
  • Is currently (within the past 30 days) using an herbal product or dietary supplement for tobacco abstinence;
  • Has recent history (in the past 3-months) of alcohol abuse or dependence as assessed by the CAGE questionnaire and study investigators;
  • Has a recent history of drug abuse as assessed by physician interview;
  • Is pregnant, lactating, or of child bearing potential, likely to become pregnant during the medication phase and not willing to use a reliable form of contraception. Reliable forms of contraception include diaphragm or condom (with spermicidal), injections, intrauterine device [IUD], surgical sterilization and abstinence;
  • Is a history of any major cardiovascular events in the past 3-months including unstable angina, acute MI or coronary angioplasty;
  • Has clinically significant acute or chronic progressive or unstable neurologic, hepatic, renal, cardiovascular, respiratory or metabolic disease;
  • Is currently on medications interacting with SAMe, including but not limited to, antidepressants, MAO inhibitors, levodopa, meperidine, dextromethorphan, pentazocine and tramadol;
  • Has another household member or relative participating in the study;
  • Has known allergy to SAMe.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00722124

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United States, Minnesota
Mayo Clinic
Rochester, Minnesota, United States, 55905
United States, Wisconsin
Franciscan Skemp HealthCare
La Crosse, Wisconsin, United States, 54601
Sponsors and Collaborators
Mayo Clinic
Pharmavite LLC
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Principal Investigator: Amit Sood, M.D. Mayo Clinic
Additional Information:
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Responsible Party: Amit Sood, M.D., Mayo Clinic Identifier: NCT00722124    
Other Study ID Numbers: 07-006365
First Posted: July 25, 2008    Key Record Dates
Results First Posted: September 9, 2011
Last Update Posted: September 9, 2011
Last Verified: August 2011
Keywords provided by Mayo Clinic:
tobacco use
Additional relevant MeSH terms:
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Tobacco Use Disorder
Substance-Related Disorders
Chemically-Induced Disorders
Mental Disorders