Methylbenzethonium Chloride Ointment
» Methylbenzethonium Chloride Ointment contains not less than 90.0 percent and not more than 110.0 percent of the labeled amount of methylbenzethonium chloride (C28H44ClNO2·H2O).
Packaging and storage Preserve in collapsible tubes or in tight containers.
Identification Suspend about 0.5 g of Ointment in 10 mL of water, add 0.1 g of sodium carbonate, 1 mL of bromophenol blue TS, and 10 mL of chloroform, and shake: the chloroform layer is blue.
pH 791: between 5.0 and 7.0, in a dispersion of it in carbon dioxide-free water (1 in 100).
0.0001 N Docusate sodium Prepare as directed for 0.0001 N Docusate sodium in the Assay under Methylbenzethonium Chloride Lotion.
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USP32NF27 Page 2938