Constituted solution
At the time of use, it meets the requirements for
Constituted Solutions under
Injections 1.
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
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 1.
Assay
Proceed as directed for erythromycin under
AntibioticsMicrobial Assays 81, 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.