General anesthesia is usually a combination of multiple drugs. We know exactly what each drug does, medical science isn’t so good at explaining why the drugs have these actions. anesthetists combine these drugs to suit the requirements of the procedure and the patient

Anesthesia usually includes drugs with distinct, separate actions, like an analgesic (to block pain receptors), muscle relaxants (so patients can be moved/organs accessed), CNS depressants (to prevent unexpected spasms disturbing the surgeon), coma-inductors (so patients don’t chat with the staff and freak them out after practicing on cadavers for years), and amnesia-inductors (because surgery is kind of gross).