TABLE III.

Interval between drug discontinuation and skin testing (adapted from Brockow and Romano³³)

Drug	Interval
H1 antihistamines
1st generation	1–3 Days
2nd generation	7 Days
H2 antihistamines	2 Days
Imipramines and phenothiazines	5 Days
Beta-adrenergic blockers	48 Hours or according to their elimination half-life
Glucocorticoids (prednisolone equivalent)
Long-term
≤10 mg	None
>10 mg	3 Weeks
Short-term
≤50 mg	3 Days
>50 mg	7 Days