Turinabol is the commonly used name for 4-chlorodehydromethyltestosterone, also known as chlorodehydromethyltestosterone. It is a synthetic anabolic-androgenic steroid structurally related to methandienone.

The compound has historically been associated with performance-enhancing use rather than routine contemporary medical treatment. Its chemical structure includes a 17-alpha-alkyl modification that supports oral activity but is also relevant to hepatic safety.

Anabolic-androgenic steroid exposure can affect endogenous hormone production, fertility, cholesterol levels, cardiovascular health, and liver function.