Abstract
Purpose: To investigate the suitability of sesame oil as an oily phase for diclofenac emulgel formulation.
 Methods: Different batches of emulgel comprising different proportions of oils (sesame oil and/or Labrafac CC), surfactants (Tween-80 and/or cremophor EL-30), and gelling agents (xanthan gum or gelatin) were prepared. The formulations were evaluated for rheology, syneresis, Fourier transform infrared (FTIR) spectroscopy, spreadability, extrudability, and anti-inflammatory activity.
 Results: Product characteristics of batches A2, A4, and A6 were not consistent with those of emulgels. Because Batch A1 showed characteristics that were the most stable, such as no pH changes, nonstatistically significant changes (p = 1.000) in the viscosity results, and least spectrum changes following FTIR investigation, it was selected as the best batch. It showed similar anti-inflammatory activity when compared with commercially available diclofenac emulgel, giving a 50 % higher anti-inflammatory effect than aqueous diclofenac dispersion. 
 Conclusion: Sesame oil is a potential lipophilic component in emulgel formulations for topical delivery of hydrophobic drugs.
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