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An improved topical formulation for urea.

V Gallardo1, A Ruiz Martínez, M A Cabrerizo

  • 1Departamento de Farmacia y Tecnología Farmaceútica, Facultad de Farmacia, Universidad de Granada, Spain.

Die Pharmazie
|November 1, 1990
PubMed
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Urea solubility was optimized using water and propylene glycol mixtures. The study evaluated topical formulations, finding water/propylene glycol effective for stable, high-concentration urea preparations.

Area of Science:

  • Pharmaceutical Sciences
  • Physical Chemistry

Background:

  • Urea is a key dermatological active ingredient.
  • High-concentration urea formulations present technological challenges.
  • Solvent selection is critical for urea solubility and stability.

Purpose of the Study:

  • To determine optimal polar solvents for urea.
  • To evaluate semisolid vehicles for topical urea formulations.
  • To assess the stability and characteristics of 40% urea preparations.

Main Methods:

  • Dielectric constant measurements for solvent screening.
  • Preparation and characterization of semisolid vehicles (cetylic excipient, Beeler's base, Carbopol gel).
  • Conductimetric and rheological analyses for stability assessment.

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Main Results:

  • Water and a water/propylene glycol (1:1 v/v) mixture identified as optimal solvents for urea.
  • Evaluated three distinct semisolid vehicles for topical application.
  • Investigated the stability of 40% (w/w) urea formulations using conductimetric and rheological data.

Conclusions:

  • Water/propylene glycol mixtures provide suitable conditions for high-concentration urea solubility.
  • The choice of vehicle significantly impacts the stability and characteristics of topical urea formulations.
  • Optimized solvent and vehicle selection is crucial for developing stable and effective dermatological urea preparations.