Self-microemulsifying drug delivery system
A self-microemulsifying drug delivery system (SMEDDS) is a drug delivery system that uses a microemulsion achieved by chemical rather than mechanical means. That is, by an intrinsic property of the drug formulation, rather than by special mixing and handling. It employs the familiar ouzo effect displayed by anethole in many anise-flavored liquors. Microemulsions have significant potential for use in drug delivery, and SMEDDS (including so-called "U-type" microemulsions) are the best of these systems identified to date.[1] SMEDDS are of particular value in increasing the absorption of lipophilic drugs taken by mouth.
SMEDDS in research or development include formulations of the drugs anethole trithione,[2] oridonin,[3][4][5] curcumin,[6] vinpocetine,[7][8] tacrolimus,[9][10][11] mitotane, berberine hydrochloride,[12] nobiletin,[13] piroxicam,[14][15] anti-malaria drugs beta-artemether[16] and halofantrine,[17][18] anti-HIV drug UC 781,[19][20] nimodipine,[21][22] exemestane,[23] anti-cancer drugs 9-nitrocamptothecin (9-NC)[24] paclitaxel,[25][26] and seocalcitol,[27][28] alprostadil (intraurethral use),[29] probucol,[18][30] itraconazole,[31] fenofibrate,[32] acyclovir,[33] simvastatin,[34][35] xibornol,[36] silymarin,[37][38] alpha-asarone,[39] enilconazole,[19] puerarin (an isoflavone found in Pueraria lobata),[40][41][42][43] atorvastatin,[44][45][46] heparin,[47] carvedilol,[48] ketoconazole,[49] gentamicin,[50] labrasol,[51] flurbiprofen,[52] celecoxib,[53] danazol,[54] cyclosporine,[55] and idebenone.[56]
Actual applications of Self-microemulsifying drug delivery system' (SMEDDS) remain rare. The first drug marketed as a SMEDDS was cyclosporin, and it had significantly improved bioavailability compared with the conventional solution. In the last decade, several SMEDDS loaded with antiviral drugs (ritonavir, saquinavir) were tested for treatment of HIV infection, but the relative improvement in clinical benefit was not significant. The SMEDDS formulation of ritonavir (soft capsules) has been withdrawn in some countries.[57]
Within the last years SMEDDS were also utilized for the oral administration of biologics. Due to ion pairing with appropriate surfactants [58] these mainly hydrophilic macromolecular drugs can be incorporated in the lipophilic phase of SMEDDS. Provided that the oily droplets being formed in the gut are sufficiently stable towards lipases,[59] can permeate the mucus gel layer in sufficient quantities [60] and exhibit permeation enhancing properties [61] the oral bioavailability of various biologics can be strongly improved [62]
SMEDDS offer numerous advantages: spontaneous formation, ease of manufacture, thermodynamic stability, and improved solubilization of bioactive materials.[1] Improved solubility contributes to faster release rates and greater bioavailability. For many drugs taken by mouth, faster release rates improve the drug acceptance by consumers. Greater bioavailability means that less drug need be used; this may lower cost, and does lower the stomach irritation and toxicity of drugs taken by mouth.
For oral use, SMEDDS may be formulated as liquids or solids, the solids packaged in capsules or tablets. Limited studies comparing these report that in terms of bioavailability liquid SMEDDS are superior to solid SMEDDS,[21] which are superior to conventional tablets.[21][42][47] Liquid SMEDDS have also shown value in injectable (IV and urethral) formulations and in a topical (oral) spray.[36]
See also
References
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- ↑ Jing Q; Shen Y; Ren F; Chen J; Jiang Z; Peng B; Leng Y; Dong J (November 2006). "HPLC determination of anethole trithione and its application to pharmacokinetics in rabbits". J Pharm Biomed Anal. 42 (5): 613–7. doi:10.1016/j.jpba.2006.05.013. PMID 16824723.
- ↑ Zhang P; Liu Y; Feng N; Xu J (May 2008). "Preparation and evaluation of self-microemulsifying drug delivery system of oridonin". Int J Pharm. 355 (1–2): 269–76. doi:10.1016/j.ijpharm.2007.12.026. PMID 18242895.
- ↑ Liu Y; Zhang P; Feng NP; Zhang X; Xu J (September 2008). "[Release kinetics of oridonin self-microemulsifying drug delivery system in vitro]". Zhongguo Zhong Yao Za Zhi (in Chinese). 33 (18): 2049–52. PMID 19160780.
- ↑ Liu Y; Zhang P; Feng N; Zhang X; Wu S; Zhao J (January 2009). "Optimization and in situ intestinal absorption of self-microemulsifying drug delivery system of oridonin". Int J Pharm. 365 (1–2): 136–42. doi:10.1016/j.ijpharm.2008.08.009. PMID 18782611.
- ↑ Cui J; Yu B; Zhao Y; Zhu W; Li H; Lou H; Zhai G (December 2008). "Enhancement of oral absorption of curcumin by self-microemulsifying drug delivery systems". Int J Pharm. 371 (1–2): 148–55. doi:10.1016/j.ijpharm.2008.12.009. PMID 19124065.
- ↑ Chen Y; Li G; Wu X; Chen Z; Hang J; Qin B; Chen S; Wang R (January 2008). "Self-microemulsifying drug delivery system (SMEDDS) of vinpocetine: formulation development and in vivo assessment". Biol. Pharm. Bull. 31 (1): 118–25. doi:10.1248/bpb.31.118. PMID 18175953.
- ↑ Cui SX; Nie SF; Li L; Wang CG; Pan WS; Sun JP (November 2008). "Preparation and Evaluation of Self-Microemulsifying Drug Delivery System Containing Vinpocetine". Drug Dev Ind Pharm. 35 (5): 603–611. doi:10.1080/03639040802488089. PMID 19040178.
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- ↑ Postolache P; Petrescu O; Dorneanu V; Zanini AC (2002). "Cyclosporine bioavailability of two physically different oral formulations". Eur Rev Med Pharmacol Sci. 6 (6): 127–31. PMID 12776806.
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- ↑ Gibaud, S. P.; Attivi, D. (2012). "Microemulsions for oral administration and their therapeutic applications" (PDF). Expert Opinion on Drug Delivery. 9 (8): 937–951. doi:10.1517/17425247.2012.694865. PMID 22663249.
- ↑ Zupančič, O; Partenhauser, A; Lam, H Th; Rohrer, J; Bernkop-Schnürch, A (2016). "Development and in vitro characterisation of an oral self-emulsifying delivery system for daptomycin". European Journal of Pharmaceutical Sciences. 81: 129–136. doi:10.1016/j.ejps.2015.10.005. PMID 26485536.
- ↑ Leonaviciute, G; Bernkop-Schnürch, A (2015). "Self-emulsifying drug delivery systems in oral (poly)peptide drug delivery". Expert Opin Drug Deliv. 12 (11): 1703–1716. doi:10.1517/17425247.2015.1068287. PMID 26477549.
- ↑ Friedl, H; Dünnhaupt, S; Hintzen, F; Waldner, C; Parikh, S; Pearson, JP; Wilcox, MD; Bernkop-Schnürch, A (2013). "Development and evaluation of a novel mucus diffusion test system approved by self-nanoemulsifying drug delivery systems". J Pharm Sci. 102 (12): 4406–4413. doi:10.1002/jps.23757. PMID 24258284.
- ↑ Sha, X; Yan, G; Wu, Y; Li, J; Fang, X (2005). "Effect of self-microemulsifying drug delivery systems containing Labrasol on tight junctions in Caco-2 cells". Eur J Pharm Sci. 24 (5): 477–486. doi:10.1016/j.ejps.2005.01.001. PMID 15784337.
- ↑ Hintzen, F; Perera, G; Hauptstein, S; Müller, C; Laffleur, F; Bernkop-Schnürch, A (2014). "In vivo evaluation of an oral self-microemulsifying drug delivery system (SMEDDS) for leuprorelin". Int J Pharm. 472 (1–2): 20–26. doi:10.1016/j.ijpharm.2014.05.047. PMID 24879935.
Further reading
- Singh, A.; Singh, V.; Juyal, D.; Rawat, G. (2015). "Self emulsifying systems: A review". Asian Journal of Pharmaceutics. 9 (1): 13. doi:10.4103/0973-8398.150031. Archived from the original on 2015-02-19. Retrieved 2015-02-19.
- Cherniakov, I.; Domb, A. J.; Hoffman, A. (2015). "Self-nano-emulsifying drug delivery systems: an update of the biopharmaceutical aspects". Expert Opinion on Drug Delivery. 12 (7): 1121–1133. doi:10.1517/17425247.2015.999038. PMID 25556987.
- Weerapol, Y.; Limmatvapirat, S.; Takeuchi, H.; Sriamornsak, P. (2015). "Fabrication of spontaneous emulsifying powders for improved dissolution of poorly water-soluble drugs". Powder Technology. 271: 100–108. doi:10.1016/j.powtec.2014.10.037.