Prescribed 20mg prednisone for covid. 12 pills tapered over 6 days. i'm asthmatic. is it ok to cut the tablets in half? 20mg is too large of a dose. i've always been on 10 mg or lower. i've had asthma my whole life so i'm familiar with steroids?

Two milligrams per kilogram (2.2 lb) is the therapeutic dose for prednisone. I would bet you are more than 22 lb and your past experience with low dose prednisone (the body makes~5 mg/d) may be less than helpful. If you don't trust your doc find a new one. Please do not expect us to enable you to contradict the doc who knows your case.

For Asthma and COPD exacerbation or flares seen in my clinic or the Emergency Room, I typically prescribe Prednisone 40 to 60mg once a day for 5 days. This is a safe dose and duration, and considered a "burst". I recommend taking it earlier in the day because it can cause insomnia.

I agree. A little more prednisone is better than too little in your case and it is for a very short period of time.