Yeah. I'm not an expert on sports medicine but I thought "PED's" were used medically all the time on active players/fighters/whatever. You use that substance under whatever common medical use its used for to heal your injury. Then you wait until it's effects have worn off, usually defined as "no longer present in your system" and you can play again.
Similair to drug testing in regular Joe work. You can take whatever your doctor says, you just have to be clear about it and what activities you are restricted from while on it.
Isn't this the boring, normal, status quo?