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 just one component of a comprehensive addiction treatment program. It works best if used alongside other types of treatment, such as counseling and support groups. Naltrexone comes in the form of a tablet that is taken by mouth. It contains the same active ingredient as VivitrolÂ® (naltrexone injection). Vivitrol is also used in the treatment of alcohol and opioid dependence.