My son is severe asthmatic. Anytime he has taken prednisone for more than 5 days it is tapered. 5 days never. I guess there is a magic cut off for how many days you take it. It has been awhile since he has had to take any, possibly 2 years so I don't remember the exact dosage. But yes, he has taken 5 day courses with no tapering but once it was upped to 10 it was always tapered.
Kelly