"Post ludes" is a colloquial term used to refer to the after-effects of a drug-induced euphoria. This term is primarily used in the context of psychedelic substances like LSD or mushrooms. Some common synonyms for this term include "afterglow," "aftermath," "comedown," "hangover," and "crash." These words are often used to describe the physical and emotional state that users experience after the initial effects of the drug have worn off. While the experience can vary from person to person, these words are often used to highlight the negative effects of drug use and serve as a reminder of the potential dangers associated with drug abuse.