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 is used for: Managing weight in certain patients when used in combination with exercise and diet. Naltrexone is a combination of 2 medicines used to control appetite. Exactly how it works is not known, but it is thought to help to release certain chemicals in the brain that control appetite.