Assay
Proceed as directed for erythromycin under
AntibioticsMicrobial Assays 81, using an accurately weighed quantity of Sterile Erythromycin Gluceptate dissolved in methanol to yield a solution containing the equivalent of about 10 mg of erythromycin per mL. Dilute this solution quantitatively with 9 volumes of
Buffer No. 3 to obtain a stock solution containing the equivalent of about 1 mg of erythromycin per mL. Where it is packaged for dispensing, constitute Sterile Erythromycin Gluceptate as directed in the labeling. Withdraw all of the withdrawable contents where the package is represented as being a single-dose container; or where the labeling specifies the amount of potency in a given volume of the resultant preparation, withdraw an accurately measured volume. Dilute quantitatively with
Buffer No. 3 to obtain a stock solution having a convenient concentration. Dilute a portion of the stock solution quantitatively with
Buffer No. 3 to obtain a
Test Dilution having a concentration assumed to be equal to the median dose level of the Standard.