Constituted solution
At the time of use, it meets the requirements for
Constituted Solutions under
Injections
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.
Identification, Infrared Absorption
197M
:
the specimen and the Reference Standard being previously dried in vacuum at a pressure not exceeding 5 mm of mercury at 60
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for 3 hours.
pH
791
:
between 6.5 and 7.5, in a solution containing the equivalent of 50 mg of erythromycin per mL.
Particulate matter
788
:
meets the requirements for small-volume injections when the constituted solution is diluted with filtered water to a concentration of not more than 5 mg of erythromycin base per mL before the test is performed.
Heavy metals, Method II
231
:
0.005%.
Other requirements
It meets the requirements under
Injections
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.
Assay
Proceed as directed for erythromycin under
AntibioticsMicrobial Assays
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, using Erythromycin Lactobionate for Injection constituted 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 erythromycin equivalent in a given volume of the resultant preparation, withdraw an accurately measured volume. Dilute quantitatively with water to obtain a stock solution containing the equivalent of about 10 mg of erythromycin per mL. Dilute this 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.