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 works in the brain to decrease the desire to drink. It does not work like some other treatments for alcohol abuse (e.g., disulfiram). It will not make you sick when taken with alcohol. This medication is also used to prevent relapse to opioid abuse, after opioid detoxification.