I just took 40 mg of Prednisone 15 minutes ago. How long does it take for the effects of the steroid to start working? I have asthma (and a bronchial infection I believe).
It usually takes a couple hours for the medicine to start working, since the medication has to be processed by your body and then begin to take effect. If your symptoms do not improve, you should call your doctor or visit an emergency room. This is especially true if your asthma is out of control and you feel like you're having trouble breathing. Good luck to you!
Here are some links that might be useful:
Asthma Maintenance Medications
Don't Be Afraid to Use Your Advair and Symbicort
Thrush (general overview)