Hi, I had gone through your question and understand your concerns. Prednisone is a steroid used for certain indications, dose and duration depends on indication, in case of respiratory allergies as a rescue therapy it may be used in dose of 10-20 mg per day in 2-3 divided doses for 5- 7 days for 20.34 LBS , but it is to be used only if prescribed and under supervision of your doctor. Hope this answers your question. If you have additional questions then please do not hesitate in writing to us. *Always check for history of allergy before taking any medicine. Take care. • DISCLAIMER: - All the information provided here is for information purpose only , it is not a substitute for the advice of a physician after physical examination , it is not intended to replace your relationship with your doctor. This information in no way establishes a doctor-patient relationship. Before acting anything based on this information do consult your doctor. I recommend that online users seek the advice of a physician who can perform an in-person physical examination