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  • Title: Stability of fluoxetine hydrochloride in fluoxetine solution diluted with common pharmaceutical diluents.
    Author: Peterson JA, Risley DS, Anderson PN, Hostettler KF.
    Journal: Am J Hosp Pharm; 1994 May 15; 51(10):1342-5. PubMed ID: 8085574.
    Abstract:
    The stability of fluoxetine hydrochloride in fluoxetine solution diluted with five common pharmaceutical diluents was studied. Fluoxetine syrup, containing fluoxetine 4 mg/mL (as the hydrochloride salt), was diluted to 1 and 2 mg/mL in each of the following: deionized water; Simple Syrup, British Pharmacopeia; Simple Syrup, USP; Aromatic Elixir, USP; and grape-cranberry drink. Each solution was divided into eight 120-mL amber glass bottles: four stored at 5 degrees C and four stored at 30 degrees C. Samples were removed from each bottle at time zero and two, four, and eight weeks and assayed in triplicate with high-performance liquid chromatographic methods for determining fluoxetine concentration and concentration of its primary degradation product, alpha-[2-(methylamino)ethyl]benzene methanol. Stability was established if the fluoxetine concentration changed by < 10% and if the concentration of the degradation product was < 1% of the initial fluoxetine concentration. No test mixture dropped below 95% of the initial fluoxetine concentration or exceeded 0.5% degradation product during the study period. Fluoxetine hydrochloride was stable for eight weeks in fluoxetine solution diluted to 1 or 2 mg/mL with common pharmaceutical diluents and stored at 5 or 30 degrees C.
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