Abstract
The delivery dose uniformity is one of the most critical requirements of dry powder inhaler and metered dose inhaler products. In 1998, the U.S. Food and Drug Administration recommended a two-tier acceptance sampling plan in the Draft Guidance of Metered Dose Inhaler and Dry Powder Inhaler Drug Products Chemistry, Manufacturing and Controls. The two-tier procedure is a modification of the United States Pharmacopeia (USP) sampling plan of dose content uniformity. It employed a zero tolerance criterion. In addition, it has a near-zero probability acceptance at the second tier. In this article, a two-tier sequential tolerance interval approach is proposed that is equivalent to a two-tier two one-sided testing procedure. It controls the probability of the product delivering below a prespecified effective dose and the probability of the product delivering over a prespecified safety dose.
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