Evaluation of drug content (potency) for compounded and FDA–approved formulations of doxycycline on receipt and after 21 days of storage

• Autores: Kate KuKanich, Butch KuKanich, Tanner Slead, Matt Warner
• Localización: JAVMA: Journal of the American Veterinary Medical Association, ISSN-e 0003-1488, Vol. 251, Nº. 7, 2017, págs. 835-842
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • OBJECTIVE To determine drug content (potency) of compounded doxycycline formulations for veterinary use and of US FDA–approved doxycycline formulations for human use < 24 hours after receipt (day 1) and after 21 days of storage under recommended conditions (day 21).

    DESIGN Evaluation study.

    SAMPLE FDA-approved doxycycline tablets (100 mg), capsules (100 mg), and liquid suspension (10 mg/mL) and compounded doxycycline formulations from 3 pharmacies (tablets [25, 100, and 150 mg; 1 product/source], chews [100 mg; 1 product/source], and liquid suspensions or solution [6 mg/mL {2 sources} and 50 mg/mL {1 source}]).

    PROCEDURES Doxycycline content was measured in 5 samples of each tablet, chew, or capsule formulation and 5 replicates/bottle of liquid formulation on days 1 and 21 by liquid chromatography and compared with US Pharmacopeia acceptable ranges.

    RESULTS All FDA-approved formulations had acceptable content on days 1 and 21. On day 1, mean doxycycline content for the 3 compounded tablet formulations was 89%, 98%, and 116% (3/5, 5/5, and 1/5 samples within acceptable ranges); day 21 content range was 86% to 112% (1/5, 5/5, and 4/5 samples within acceptable ranges). Day 1 content of chews was 81%, 78%, and 98% (0/5, 0/5, and 5/5 samples within acceptable ranges), and that of compounded liquids was 50%, 52%, and 85% (no results within acceptable ranges). No chews or compounded liquid formulations met USP standards on day 21.

    CONCLUSIONS AND CLINICAL RELEVANCE FDA-approved doxycycline should be prescribed when possible. Whole tablets yielded the most consistent doxycycline content for compounded formulations.