Another interesting side effect of corticosteroids is that it weakens tendons.
As a former ball player, I've had several cortisone shots. After having some shots in my knee for a couple of weeks, my bicep tendon tore clean off the bone doing nothing special.
My experience led me to look into why, what causes this, etc. Talked to some doctors.

I've given myself Dex numerous times for swelling, bad back and so forth. Usually 3cc and I'm a 240lb catch weight. I'll drop several pounds of fluid and yawn and stretch a lot. Like my muscles need to be awakened every now and then for about 24 hours. 2cc, does not affect me in this way. So, be careful and consider all potential side effects and maybe experiment before getting too close to show time.