AAPS PharmSciTech

, Volume 7, Issue 1, pp E1–E9

Formulation and in vitro, in vivo evaluation of extended- release matrix tablet of Zidovudine: Influence of combination of hydrophilic and hydrophobic matrix formers


  • Atul Kuksal
    • Department of Pharmaceutical Sciences and Drug ResearchPunjabi University
  • Ashok K. Tiwary
    • Department of Pharmaceutical Sciences and Drug ResearchPunjabi University
  • Narendra K. Jain
    • Department of Pharmaceutical SciencesDr Hari Singh Gour University
    • Department of Pharmaceutical Sciences and Drug ResearchPunjabi University

DOI: 10.1208/pt070101

Cite this article as:
Kuksal, A., Tiwary, A.K., Jain, N.K. et al. AAPS PharmSciTech (2006) 7: E1. doi:10.1208/pt070101


The aim of the present study was to prepare and characterize extended-release matrix tablets of zidovudine using hydrophilic Eudragit RLPO and RSPO alone or their combination with hydrophobic ethyl cellulose. Release kinetics was evaluated by using United States Pharmacopeia (USP)-22 type I dissolution apparatus. Scanning electron microscopy was used to visualize the effect of dissolution medium on matrix tablet surface. Furthermore, the in vitro and in vivo newly formulated sustained-release zidovudine tablets were compared with conventional marketed tablet (Zidovir, Cipla Ltd, Mumbai, India). The in-vitro drug release study revealed that either Eudragit preparation was able to sustain the drug release only for 6 hours (94.3%±4.5% release). Combining Eudragit with ethyl cellulose sustained the drug release for 12 hours (88.1%±4.1% release). Fitting the in vitro drug release data to Korsmeyer equation indicated that diffusion along with erosion could be the mechanism of drug release. In vivo investigation in rabbits showed sustained-release pharmacokinetic profile of zidovudine from the matrix tablets formulated using combination of Eudragits and ethylcellulose. In conclusion, the results suggest that the developed sustained-release tablets of zidovudine could perform therapeutically better than conventional dosage forms, leading to improve efficacy and better patient compliance.


anti-HIV drugZidovudinematrix tabletssustained releasemechanismscanning electron microscopy

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© American Association of Pharmaceutical Scientists 2006