The usual protocol for tapering off oral prednisone is 60 mg/d for 4 days, followed by a 10-day taper (50 mg/d for 2 days, 40 mg/d for 2 days, 30 mg/d for 2 days, 20 mg/d for 2 days, then 10 mg/d for 2 days).
So you need to follow this protocol.
You should take 10 mg/d for 2 days before stopping the medication.
You should take your missed dose now if it is not more than 4 hours and take your next dose as per schedule.It is not advisable to take oneself off of it suddenly.
Because of severe unwanted effects on body as adrenal glands steroid production is supressed and if external intake is stopped suddeny, it leads to steroid deficiency in body with severe consequencial effects.Skip the missed dose if it is almost time for your next scheduled dose.
Do not take extra medicine to make up the missed dose.
And consult your doctor as well if your rash has gone completely.
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Thanks for the follow-up.
You should follow your doctor's advised protocol as main thing is to taper off prednisone gradually instead of stop it suddenly to prevent any adverse effects.
Now main question was you have skipped a dose.
So if it was not more than 4 hours then you should take your missed dose now and take next dose on schedule.
However if it is almost time for your next scheduled dose.Do not take extra medicine to make up the missed dose and continue your protocol.
It's good to set an alarm for taking medicine on time.