Evidence-Based Reviews

N-acetylcysteine: A potential treatment for substance use disorders

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Clinical implications. Data on NAC’s efficacy for tobacco use disorder come from small, pilot trials. Although initial evidence is promising, it is premature to suggest NAC for smoking cessation until a fully powered, randomized clinical trial provides evidence of efficacy.

Alcohol use disorder

Alcohol use disorders are widely prevalent; 13.9% of U.S. adults met criteria in the past year, and 29.1% of U.S. adults meet criteria in their lifetime.38 Alcohol use disorders can result in significant negative consequences, including relationship problems, violent behavior, medical problems, and death. Existing FDA-approved medications for alcohol use disorder include naltrexone, acamprosate, and disulfiram.

Due to the severe potential health consequences of alcohol, NAC has been examined as a possible aid in preventing relapse. However, most studies have been conducted using animals. Three studies have examined alcohol use in humans (Table 536,39,40). One was a pilot study,39 and the other 2 were secondary data analyses.36,40 None of them specifically focused on alcohol use disorders. A pilot study of 35 veterans with co-occurring posttraumautic stress disorder (PTSD) and SUDs (82% of whom had an alcohol use disorder) found that compared with placebo, NAC significantly decreased PTSD symptoms, craving, and depression.39 In a study of 75 adults with bipolar disorder, secondary alcohol use was not significantly reduced.36 However, one study suggested that NAC may decrease adolescent alcohol and marijuana co-use.40 Future work is needed to examine the potential clinical utility of NAC in individuals with alcohol use disorders.

NAC for the treatment of alcohol use disorder image

Findings from animal studies indicate that NAC may:

  • reduce alcohol-seeking41
  • reduce withdrawal symptoms42
  • reduce the teratogenic effects of alcohol43
  • prevent alcohol toxicity44
  • reduce health-related consequences of alcohol (eg, myocardial oxidative stress45 and alcohol-related steatohepatitis46).

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