I was put on 40mg per day of Prednisone for a sinus infection. I...

har1ey, it is dangerous to stop Prednisone suddenly -if your taking it for more than 5 days you should be tapered off
"Do not stop taking prednisone without talking to your doctor. If you suddenly stop taking prednisone, your body may not have enough natural steroids to function normally. This may cause symptoms such as extreme tiredness, weakness, slowed movements, upset stomach, weight loss, changes in skin color, sores in the mouth, and craving for salt, and may cause death. Call your doctor if you experience these or other unusual symptoms while you are taking decreasing doses of prednisone or after you stop taking the medication."
from another site I was reading. I also know this because I have taken it more than once and I work in a pharmacy.I have never seen it taken the way you were prescribed it.