Stupefacients is a term that refers to drugs or substances that are capable of causing mental or physical stupor. There are several synonyms for this word, including narcotics, sedatives, tranquilizers, opioids, painkillers, hypnotics, anesthetics, and psychotropics. Each of these terms refers to different types of drugs that are used for different purposes, but all have the potential to induce stupor or a state of reduced consciousness. While some of these drugs are used for legitimate medical purposes, others are commonly abused or used recreationally, leading to serious health and social problems. It is essential to understand their effects and risks before using or prescribing them.