How do intravenous anesthetics enter the bloodstream?

Intravenous anesthetics enter the bloodstream through direct injection. This method allows for the rapid onset of anesthesia, typically resulting in unconsciousness within 10 to 15 seconds of the injection's start.1

These drugs, which include agents such as propofol, ketamine, barbiturates, and benzodiazepines, are effective because of their high solubility in lipids and their relatively high perfusion rate in the brain. Because anesthetics are potent systemic agents that can cause permanent injury or death if not carefully managed, it is an ethical imperative that cardiac and respiratory functions be closely monitored by medical professionals during their administration.12