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.
You and your doctor have to decide this. Most people take the medicine for 12 weeks or more. Naltrexone only has to be taken once a day. Be sure to take naltrexone just the way your doctor tells you to. Don't take extra pills, don't skip pills and don't stop taking pills until you talk to your doctor.