Superdrol is the brand name for Methasterone, an oral anabolic steroid that was first described in 1956 by Syntex; the same pharmaceutical company that formulated Anadrol 50 and Masteron.

Syntex was attempting to find an azo compound with anti-tumor properties 

In late 2004, Superdrol was sold by Designer Supplements LLC via the internet 

Superdrol was incorrectly marketed and sold as a prohormone, in an attempt to bypass the Steroids Control Act of 1990.

Superdrol developed somewhat of a cult following due to its potent effects; able to build significant amounts of lean muscle, without any water retention.

SUPERdrol was a fitting name for such a powerful over-the-counter product.