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Development of Bioadhesive Chitosan Gels for Topical Delivery of Lidocaine



Varshosaz J1, 2 ; Jaffari F3 ; Karimzadeh S3
Authors
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Authors Affiliations
  1. 1. Skin and Stem Cell Research Center, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Department of Pharmacognosy, School of Pharmacy, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Skin Disease and Leishmaniasis Research Center, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Journal of Isfahan Medical School Published:2012

Abstract

Background: Lidocaine (LC) is a local anesthetic agent. The aim of this study is the prolonging of the anesthetic effect of this drug for transdermal delivery. Methods: LC hydrochloride gels were prepared with three different molecular weights (MW) and concentrations of chitosan. Lecithin was used as permeation enhancer. Viscosity, bioadhesion, drug release from synthetic membranes, drug permeation through the biological barrier (rat skin) and antinociceptive effect of gels were studied. Increasing the concentration of chitosan caused a decrease in the bioadhesion. Findings: Studing drug release in gels showed that increasing the concentration and MW of chitosan caused an increase in the amount, extent, and rate of influx of the drug. This is probably due to the increase in repulsive forces between LC and chitosan cations. The flux of the drug through the rat skin was higher for 3% high MW chitosan gel (H3) compared to the standard gel. LC was effective topically in hind paw formalin assay. It was most active immediately after its administration. The analgesic activity of LC in H3 gel could cover the duration of the formalin nociception. The maximal response of LC in comparable doses of H3 and standard gel was about 52% and 36% analgesia in the second phase, respectively compared to the control group. Conclusion: The higher response of the H3 gel may be attributed to the bioadhesive effect of the chitosan base and the higher concentrations of LC compared to the standard gel. © 2012, Isfahan University of Medical Sciences(IUMS). All rights reserved.
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