The test for Weight Variation is applicable for the following dosage forms: (W1) solutions for inhalation that are packaged in glass or plastic ampuls and intended for use in nebulizers, and oral solutions packaged in unit-dose containers and into soft capsules;(W2) solids (including sterile solids) that are packaged in single-unit containers an contain no added substances, whether active or inactive;(W3) solids (including sterile solids) that are packaged in single-unit containers, with or without added substances, whether active or inactive, that have been prepared from true solutions and freeze-dried in the final containers and are labeled to indicate this method of preparation; and(W4) hard capsules, uncoated tablets, or film-coated tablets, containing 25 mg or more of a drug substance comprising 25% or more, by weight, of the dosage unit or, in the case of hard capsules, the capsule contents, except that uniformity of other drug substances present in lesser proportions is demonstrated by meeting Content Uniformity requirements.The test for Content Uniformity is required for all dosage forms not meeting the above conditions for the Weight Variation test. Alternatively, products listed in item (W4) above that do not meet th25 mg/25% threshold limit may be tested for uniformity of dosage units by Weight Variation insteof the Content Uniformity test if the concentration relative standard deviation (RSD) of the drugsubstance in the final dosage units is not more than 2%, based on process validation data and development data. The concentration RSD is the RSD of the concentration per dosage unit (w/wor w/v), where concentration per dosage unit equals the assay result per dosage unit divided bythe individual dosage unit weight. See the RSD formula in Table 2.
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