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Self-microemulsifying drug delivery system for improved oral bioavailability of dipyridamole: Preparation and evaluation

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Abstract

Dipyridamole shows poor and variable bioavailability after oral administration due to pHdependent solubility, low biomembrane permeability as well as being a substrate of P-glycoprotein. In order to improve the oral absorption of dipyridamole, a self-microemulsifying drug delivery system (SMEDDS) for dipyridamole was prepared and evaluated in vitro and in vivo. The optimum formulation was 18% oleic acid, 12% Labrafac lipophile WL 1349, 42% Solutol HS 15 and 28% isopropyl alcohol. It was found that the performance of self-microemulsification with the combination of oleic acid and Labrafac lipophile WL 1349 increased compared with just one oil. The results obtained from an in vitro dissolution assay indicated that dipyridamole in SMEDDS dissolved rapidly and completely in pH 6.8 aqueous media, while the commercial drug tablet was less soluble. An oral bioavailability study in rats showed that dipyridamole in the SMEDDS formulation had a 2.06-fold increased absorption compared with the simple drug suspension. It was evident that SMEDDS may be an effective approach to improve the oral absorption for drugs having pH-dependent solubility.

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Authors and Affiliations

  1. Department of Pharmacy, Medical College, Nanchang University, No. 461, Bayi Road, Nanchang, Jiangxi Province, 330006, China

    Feng Guo, Haijun Zhong, Jing He, Baogang Xie, Fen Liu, Helin Xu, Minmin Liu & Chunlian Xu

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  1. Feng Guo
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  2. Haijun Zhong
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  3. Jing He
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  4. Baogang Xie
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  5. Fen Liu
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  6. Helin Xu
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  7. Minmin Liu
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  8. Chunlian Xu
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Correspondence to Haijun Zhong.

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Guo, F., Zhong, H., He, J. et al. Self-microemulsifying drug delivery system for improved oral bioavailability of dipyridamole: Preparation and evaluation. Arch. Pharm. Res. 34, 1113–1123 (2011). https://doi.org/10.1007/s12272-011-0709-8

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  • DOI: https://doi.org/10.1007/s12272-011-0709-8

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