30mg daily for a week is a pretty standard dose. This is what the BNF says about tapering of steroid doses:
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The CSM has recommended that gradual withdrawal of systemic corticosteroids should be considered in those whose disease is unlikely to relapse and have
* recently received repeated courses (particularly if taken for longer than 3 weeks)
* taken a short course within 1 year of stopping long-term therapy
* other possible causes of adrenal suppression
* received more than 40 mg daily prednisolone (or equivalent)
* been given repeat doses in the evening
* received more than 3 weeks’ treatment
Systemic corticosteroids may be stopped abruptly in those whose disease is unlikely to relapse and who have received treatment for 3 weeks or less and who are not included in the patient groups described above.
During corticosteroid withdrawal the dose may be reduced rapidly down to physiological doses (equivalent to prednisolone 7.5 mg daily) and then reduced more slowly. Assessment of the disease may be needed during withdrawal to ensure that relapse does not occur.
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So most patients receiving prednisolone for an exacerbation of asthma are not going to need to have their dose gradually reduced.
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