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Dose-effect ratio, in terms of FEV1 increase, of the two different formulations of beclomethasone: the traditional CFC formulation, and the new extra-fine HFA formulation. To obtain the same effect on FEV1 of 250 mcg of BDP in the traditional formulation, only 100 mcg of BDP in the new extra-fine HFA formulation is required [11a, 11b].
