FDA-approved medications
Three medications—acamprosate, naltrexone, and disulfiram—currently are FDA-approved for treating AUD.5,6 Additionally, several other medications have shown varying levels of efficacy in treating patients with AUD but are not FDA-approved for this indication (Table 3).5-8
Acamprosate is thought to create a balance of inhibitor and excitatory neurotransmitters by functioning as a glutamate antagonist and gamma-aminobutyric acid (GABA) agonist. This is speculated to aid in abstinence from alcohol. Data suggests that acamprosate may be more effective for maintaining abstinence than for inducing remission in individuals who have not yet detoxified from alcohol. Because of its renal excretion, acamprosate is the only FDA-approved medication for AUD that is not associated with liver toxicity. The most commonly reported adverse effect with acamprosate use is diarrhea.
Naltrexone, a mu-opioid receptor antagonist, is available in both tablet and long-acting IM injection formulations. Naltrexone blocks the binding of endorphins created by alcohol consumption to opioid receptors. This results in diminished dopamine release and is speculated to decrease reward and positive reinforcement with alcohol consumption, leading to fewer heavy drinking days. Due to hepatic metabolism, naltrexone use carries a risk of liver injury. Cases of hepatitis and clinically significant liver dysfunction as well as transient, asymptomatic, hepatic transaminase elevations have been observed in patients who receive naltrexone. Because of the absence of first-pass metabolism, long-acting IM naltrexone may produce less hepatotoxicity than the oral formulation. When the FDA approved both formulations of naltrexone, a “black-box” warning was issued concerning the risk of liver damage; however, these warnings have since been removed from their respective prescribing information.
Disulfiram inhibits acetaldehyde dehydrogenase, resulting in elevated acetaldehyde concentrations after consuming alcohol. In theory, this medication reduces a person’s desire to drink due to the negative physiological and physical effects associated with increased acetaldehyde, including hypotension, flushing, nausea, and vomiting. Although most of these reactions are short-lived, disulfiram can induce hepatotoxicity and liver failure that may prove fatal. Disulfiram should be avoided in patients with advanced ALD.
Off-label medications for AUD
Additional pharmacotherapeutic agents have been evaluated in patients with AUD. Baclofen, topiramate, gabapentin, and ondansetron have shown varying levels of efficacy and pose minimal concern in patients with ALD.
Continue to: Baclofen