Hydrocortisone Acetate Lotion

This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition

Issued and maintained by the United States Pharmacopeial Convention (USP)

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Hydrocortisone Acetate Lotion is Hydrocortisone Acetate in a suitable aqueous vehicle. It contains not less than 90.0 percent and not more than 110.0 percent of the labeled amount of hydrocortisone acetate (C₂₃H₃₂O₆). 

Packaging and storage—Preserve in tight containers. 

USP Reference standards 〈11〉— 

USP Hydrocortisone Acetate RS 

Identication—It responds to the Identication test under Hydrocortisone Acetate Ointment. 

Minimum fill 〈755〉: meets the requirements. 

Assay— 

Mobile phase—Prepare a filtered and degassed solution containing butyl chloride, water-saturated butyl chloride, tetrahydrofuran, methanol, and glacial acetic acid (475:475:70:35:30). Make adjustments if necessary (see System Suitability under Chromatography 〈621〉). Standard preparation—Dissolve an accurately weighed quantity of USP Hydrocortisone Acetate RS in water-saturated chloroform to obtain a solution having a known concentration of about 0.10 mg per mL. 

Assay preparation—Transfer an accurately weighed quantity of Lotion, equivalent to about 2.5 mg of hydrocortisone acetate, to a closable container. Add 25.0 mL of water-saturated chloroform and about 10 glass beads. Securely close the container, and shake vigorously for approximately 15 minutes. Centrifuge, and use the clear, lower chloroform layer. 

Procedure—Introduce equal volumes of the Assay preparation and the Standard preparation into a high-pressure liquid chromatograph fitted with a 254-nm detector. Typically the apparatus is fitted with a 4-mm × 30-cm column containing packing L3 and operated at room temperature. Six replicate injections of the Standard preparation show a relative standard deviation of not more than 2.0%. Calculate the quantity, in mg, of hydrocortisone acetate (C₂₃H₃₂O₆) in the portion of Lotion taken by the formula: 

25C(r_U/r_S) 

in which C is the concentration, in mg per mL, of USP Hydrocortisone Acetate RS in the Standard preparation; and r_U and r_S are the hydrocortisone acetate peak responses obtained from the Assay preparation and the Standard preparation, respectively.