How long does prednisone stay in your body?

Hello,

It takes approximately 16.5 to 22 hours for Prednisone to be out of your system.
The elimination half life of prednisone is around 3 to 4 hours. This is the time it takes for your body to reduce the plasma levels by half.
It usually takes around 5.5 x half-life for a drug to be completely eliminated from your system.

Source: Drugs.com

Regards, masso