testosterone is very frequently prescribed, as is hgh

I had a medically prescribed steroid (cortisone) injection in my shoulder to overcome an injury. It's pretty common

http://en.wikipedia.org/wiki/Cortisone#Effects_and_uses

Having said that, there are different types of steroids and not all of them are prescribed by (honest) medical experts.

Allergies and asthma are two common reasons steroids are prescribed.

I had a nasty case of poison oak which required steroids to clear up, it was not fun at all.