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Pharmaceutical studies on the polymorphism of hydrochlorothiazide

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Abstract

Four polymorphic forms (I, II, III and IV) of hydrochlorothiazide have been characterized on the basis of x-ray diffractometry and differential thermal analysis. Form I was obtained by crystallization from N,N-dimethylformamide and Form II was crystallized from hot methanol. Form III was precipitated from sodium hydroxide aqueous solution by treatment with hydrochloric acid and Form IV was crystallized from 50% methanol. The metastable form I was a most stable form among four polymorphs, which was stable more than ten months at room temperature. The thermodynamic parameters such as heat of solution, enthalpy, entropy, free energy difference and transition temperature were determined by the measurement of intrinsic dissolution rate. The transition temperature and the heat of transition between the metastable Form I and Form II were determined to be 299.15°K and 5.03 Kcal/mole, respectively and free energy difference (δF) was 302.13 cal/mole. Diuretic action of these four polymorphic forms was also evaluated by monitoring the difference in urinary excretion of sodium, potassium and magnesium in rats.

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Authors and Affiliations

  1. Department of Pharmacy, Chung-Nam National University, 300-31, Daejeon

    Bong Hee Kim

  2. College of Pharmacy, Chung Ang University, Seoul 151, Korea

    Johng Kap Kim

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  1. Bong Hee Kim
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  2. Johng Kap Kim
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Kim, B.H., Kim, J.K. Pharmaceutical studies on the polymorphism of hydrochlorothiazide. Arch. Pharm. Res. 7, 47–52 (1984). https://doi.org/10.1007/BF02856921

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  • DOI: https://doi.org/10.1007/BF02856921

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