Common anesthetics used in operating rooms include both intravenous (IV) and inhaled forms. In the U.S., popular IV anesthetics are thiopental, ketamine, diazepam, methohexital, and propofol. Inhaled agents include nitrous oxide, halothane, isoflurane, and enflurane, with xenon being used less frequently. While diethyl ether and chloroform are still utilized in some countries, their use is restricted due to safety concerns. Muscle relaxants are often administered alongside these anesthetics to enhance effectiveness. The choice of anesthetic can vary significantly based on regional practices and regulations.