Trifluoperazine Oral Solution

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

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

DOWNLOAD PDF HERE

Trifluoperazine Oral Solution contains an amount of trifluoperazine hydrochloride (C₂₁H₂₄F₃N₃S · 2HCl) equivalent to not less than 93.0 percent and not more than 107.0 percent of the labeled amount of trifluoperazine (C₂₁H₂₄F₃N₃S).

1 Packaging and storage

Preserve in tight, light-resistant containers.

1.1 USP Reference standards 〈11〉

USP Trifluoperazine Hydrochloride RS

[Note-Throughout the following procedures, protect test or assay specimens, the Reference Standard, and solutions containing them, by conducting the procedures without delay, under subdued light, or using low-actinic glassware.]

2 Identification

Change to read:

A: Spectroscopic Identification Tests 〈197〉, Ultraviolet-Visible Spectroscopy: 197U

Solution: Prepared as directed in the Assay.

B: Mix 1 mL of Oral Solution with 5 mL of methanol: a 5-µL portion of this solution meets the requirements of Identification test D under Trifluoperazine Hydrochloride.

pH 〈791〉: between 2.0 and 3.2.

3 Assay

[Note-Use low-actinic glassware.] Transfer an accurately measured volume of Oral Solution, equivalent to about 50 mg of trifluoperazine, to a 250-mL separator with the aid of about 100 mL of water. Add 10 mL of sodium hydroxide solution (1 in 10), and extract with three 50-mL portions of cyclohexane. Wash the combined cyclohexane extracts with about 20 mL of water, and discard the water washing. Extract the combined cyclohexane extracts with four 50-mL portions of 0.1 N hydrochloric acid, collecting the aqueous extracts in a 500-mL volumetric flask. Dilute with 0.1 N hydrochloric acid to volume, and mix. Transfer 10.0 mL of this solution to a 100-mL volumetric flask, dilute with 0.1 N hydrochloric acid to volume, and mix. Concomitantly determine the absorbances of this solution and of a Standard solution of USP Trifluoperazine Hydrochloride RS in the same medium having a known concentration of about 12 µg per mL in 1-cm cells at 278 nm and at the wavelength of maximum absorbance at about 255 nm, with a suitable spectrophotometer, using 0.1 N hydrochloric acid as the blank. Calculate the quantity, in mg, of trifluoperazine (C₂₁H₂₄F₃N₃S) in each mL of the Oral Solution taken by the formula:

(407.51/480.43)(5C/V)(A₂₅₅ − A₂₇₈)_ᵁ/(A₂₅₅ − A₂₇₈)_ˢ

in which 407.51 and 480.43 are the molecular weights of trifluoperazine and trifluoperazine hydrochloride, respectively; C is the concentration, in µg per mL, of USP Trifluoperazine Hydrochloride RS in the Standard solution; V is the volume, in mL, of Oral Solution taken; and the parenthetic expressions are the differences in the absorbances of the two solutions at the wavelengths indicated by the subscripts, for the assay solution (U) and the Standard solution (S), respectively.