It may involve writing a scrip (or order) for the steroid, but since it's all handled internally, you may not see/know about it.

FWIW, my results were mixed. I had some that didn't work at all, some that worked for anywhere from a few days to a year, and in a couple of cases, indefinitely. With these injections, finding the correct injection point is critical, and can make all the difference between success and failure, which depends on the skill & experience of the doctor doing them.

Doc