The autonomic nervous system is the part of the nervous system that controls muscles of internal organs (such as the heart, blood vessels, lungs, stomach, and intestines) and glands (such as salivary glands and sweat glands).
Naltrexone is also used to reduce cravings for alcohol. Scientists are unsure how it works in relation to alcohol but it has been shown to reduce desire and cravings by blocking the same receptors that create feelings of pleasure when opioids are taken.
Naltrexone blocks the effects of narcotic medicines and alcohol. Naltrexone injection is used to treat addiction to alcohol or narcotic drugs. It is also used to prevent narcotic addiction relapse. Naltrexone injection may also be used for purposes not listed in this medication guide.