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.
Studies have looked at the use of Naltrexone over a 12 week period to help people who have stopped drinking to reduce the craving for alcohol during the early days of abstinence when the risk of a relapse is the greatest, Although it may be used for longer in clinical practice.