Nandrolone is a synthetic anabolic androgenic steroid used medically for treating osteoporosis, muscle wasting, and breast cancer in women. It is also a popular performance-enhancing drug used by bodybuilders and athletes to gain muscle mass, strength, and endurance. Nandrolone has several synonyms, including 19-nortestosterone, 19-NT, Norandrostenolone, 17β-Hydroxyestr-4-en-3-one, and 17β-Hydroxy-19-nor-4-androsten-3-one. Each of these names refers to the same steroid, but with slight variations in chemical structure and naming conventions. Understanding the synonyms of nandrolone is essential for medical professionals, athletes, and anyone interested in steroids and their effects.