This question has also been asked and answered here: How long does prednisone stay in your system for... I have bronchitis?
From the information I could find in a literature book is that prednisone has an half life of 2 to 3 hours. It takes 5.5 x half life for a medicine to be cleared from your system ... so it'll stay in your system until then.
So prednisone will be in your system for approximately 16.5 hours.
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