What conditions is naltrexone used to treat?
Naltrexone is used to treat alcohol use disorder and opioid use disorder. It helps reduce cravings and the rewarding effects of alcohol or opioids, which can support recovery and lower the chance of relapse.
How does naltrexone work for alcohol vs. opioids?
For opioid use disorder, naltrexone blocks opioid receptors. That reduces the effects of opioid drugs (such as heroin or prescription opioids) and helps prevent relapse after detox.
For alcohol use disorder, it alters opioid signaling in the brain that is involved in alcohol reward, which can reduce heavy drinking in some people.
Can naltrexone be used for “pain” or general addiction support?
Naltrexone is not used as a general pain medicine. Because it blocks opioid receptors, it is also not used to treat acute opioid overdose or to manage opioid intoxication. It is used as a treatment option for maintaining abstinence/reducing relapse risk in people with alcohol or opioid use disorder.
What should patients know before starting it?
A key safety point is that people must be opioid-free before starting naltrexone to avoid triggering withdrawal, since it blocks opioid receptors. Clinicians typically confirm the absence of opioids (and consider liver function testing) before initiating therapy.
Does naltrexone only come in one form?
Commonly, naltrexone is used as an oral medication, and there is also a long-acting injectable form for people who benefit from less frequent dosing. The choice depends on adherence needs and treatment plan.
Sources
No external sources were provided with your question, so I did not cite any.