how long do the effects of anesthesia last?
<answer> Modern anesthesia gases leave the body within 24 hours. Intravenous medications are filtered through the kidneys and/or liver and may take 24 to 48 hours. <context> How long do the effects of general anesthesia last? General anesthesia is usually a combination of inhaled anesthesia gases and intravenous medications. If you have no medical problems, modern anesthesia gases leave the body within 24 hours. Intravenous medications are filtered through the kidneys and/or liver and may take 24 to 48 hours. Within 72 hours all side effects associated with general anesthesia should be gone.