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Naltrexone is a small molecule opioid receptor antagonist primarily used to treat alcohol use disorder (AUD) and opioid use disorder (OUD). It works by competitively binding to opioid receptors, particularly the mu-opioid receptor, thereby blocking the euphoric and rewarding effects of opioids and alcohol. This reduces cravings and helps prevent relapse in individuals with substance dependence. Naltrexone does not produce opioid-like effects or cause dependence. It is available as oral tablets or as an extended-release intramuscular injection. The mechanism for its effect in alcoholism is not fully understood but may involve modulation of the endogenous opioid system[1][2][4][5]. The combination "naltrexone + 2-butanol" does not correspond to any known approved pharmaceutical product, fixed-dose combination, or established therapy based on current evidence. There are no brand names, code names, or clinical indications for this specific combination.
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