After the Kefauver Harris Amendment was passed in 1962, the . FDA began the DESI review process to ensure the safety and efficacy of drugs approved under the more lenient pre-1962 standards, including Dianabol.  In 1965, the FDA pressured CIBA to further document its legitimate medical uses, and re-approved the drug for treating post-menopausal osteoporosis and pituitary-deficient dwarfism .  After CIBA's patent exclusivity period lapsed, other manufacturers began to market generic metandienone in the .
Despite appearances, this theory has very little evidence to back itself up with no real scientific evidence to suggest that a bridge is even possible, although granted that the majority of our working knowledge comes through trial and error. However, even the propnents of a "d-bol bridge" admit that complete restoration of LH function will not be achieved until one is completely off of all compounds. With that said, it is unlikely that a "bridge" will help to maintain muscle mass while you are able to recover both HPTA and LH function. The only solution is to come completely off all substances and run a proper post-cycle therapy.
Methandrostenolone (Dianabol) is the most popular oral steroid currently on the market. In the mid 1950’s during the Olympics, many of the events were being won by the Soviet Union. A doctor by the name of Dr. John Ziegler found out that the Soviet Union team was using Testosterone to enhance their performance. When Dr. Ziegler got back to the United States he immediately started administering Testosterone to a few of his athletes. A few weeks passed and the athletes were not seeing or feeling any effects from the Testosterone. Dr. Ziegler approached CIBA Pharmaceuticals with an idea to create an oral Anabolic Steroid which would be effective and fast acting. This led to the creation of Dianabol.