Methyldrostanolone, also known as methasteron, is a potent oral anabolic steroid that was never sold as a prescription drug. In structure, this steroid is a close derivative of drostanolone masteron. An effective dosage of methyldrostanolone for physique or performance-enhancing purposes seems to begin in the range of 10-20 mg per day, taken for no longer than 6 or 8 weeks. At this level it seems to impart a measurable muscle-building effect, which is usually accompanied by fat loss and increased definition.