You missed the first part (essential) of the sentence. Tapering steroids (also called corticosteroids or glucosteroids) while (you are taking this medicine) at a high dose is often not so difficult. While is a conjunction.
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You missed the first part (essential) of the sentence.
Tapering steroids (also called corticosteroids or glucosteroids) while (you are taking this medicine) at a high dose is often not so difficult.
While is a conjunction.