Abstract
Background: Darifenacin hydrobromide, a BCS Class II drug, is poorly bioavailable due to extensive first-pass metabolism. The present study is an attempt to investigate an alternative route of drug delivery by developing a nanometric microemulsion-based transdermal gel for the management of an overactive bladder.
Methods: Oil, surfactant, and cosurfactant were selected based on the solubility of the drug, and surfactant: cosurfactant in surfactant mixture (Smix) was selected at a 1:1 ratio as inferred from the pseudo ternary phase diagram. The D-optimal mixture design was used to optimize the o/w microemulsion wherein the globule size and zeta potential were selected as dependable variables. The prepared microemulsions were also characterized for various physico-chemical properties like transmittance, conductivity, and TEM. The optimized microemulsion was gelled using Carbopol 934 P and assessed for drug release in vitro and ex vivo, viscosity, spreadability, pH, etc.
Results: Drug excipient compatibility studies showed that the drug was compatible with formulation components. The optimized microemulsion showed a globule size of less than 50 nm and a high zeta potential of -20.56 mV. The ME gel could sustain the drug release for 8 hours as reflected in in vitro and ex vivo skin permeation and retention studies. The accelerated stability study showed no significant change in applied storage conditions.
Conclusion: An effective, stable, non-invasive microemulsion gel containing darifenacin hydrobromide was developed. The achieved merits could translate into increased bioavailability and dose reduction. Further confirmatory in vivo studies on this novel formulation, which is a cost-effective & industrially scalable option, can improve the pharmacoeconomics of overactive bladder management.
Graphical Abstract
[http://dx.doi.org/10.1016/S0090-4295(02)02243-4] [PMID: 12559262]
[http://dx.doi.org/10.1111/j.1757-5672.2011.00122.x] [PMID: 26676700]
[http://dx.doi.org/10.2147/RRU.S93636] [PMID: 27556018]
[http://dx.doi.org/10.5114/pm.2014.47984] [PMID: 26327873]
[http://dx.doi.org/10.2147/RRU.S102441] [PMID: 27350947]
[http://dx.doi.org/10.1038/s41598-020-76846-0] [PMID: 33188254]
[http://dx.doi.org/10.1097/MOU.0b013e328302ccc1] [PMID: 18520759]
[http://dx.doi.org/10.1016/S0024-3205(97)00047-7] [PMID: 9121347]
[http://dx.doi.org/10.1517/13543784.13.11.1493] [PMID: 15500396]
[http://dx.doi.org/10.1002/nau.20796] [PMID: 19693952]
[http://dx.doi.org/10.2165/00003088-200645040-00001] [PMID: 16584282]
[http://dx.doi.org/10.1177/1756287220922425] [PMID: 32489425]
[http://dx.doi.org/10.1155/2013/983702] [PMID: 26556003]
[http://dx.doi.org/10.5530/ijper.53.2s.67]
[http://dx.doi.org/10.31351/vol28iss2pp83-94]
[http://dx.doi.org/10.36106/ijar/5800512]
[http://dx.doi.org/10.3390/pharmaceutics7040438] [PMID: 26506371]
[http://dx.doi.org/10.1016/S0168-3659(02)00049-4] [PMID: 11992679]
[http://dx.doi.org/10.1016/j.ijpharm.2007.12.022] [PMID: 18243604]
[http://dx.doi.org/10.22159/ajpcr.2019.v12i5.32444]
[http://dx.doi.org/10.1016/0021-9797(67)90099-9]
[http://dx.doi.org/10.1021/j100299a052]
[http://dx.doi.org/10.3126/kuset.v13i1.21251]
[http://dx.doi.org/10.22159/ajpcr.2018.v11i11.27552]
[http://dx.doi.org/10.3892/mmr.2017.6147] [PMID: 28138704]
[http://dx.doi.org/10.1080/01932691.2021.1880928]
[http://dx.doi.org/10.1016/j.ijpharm.2014.10.005] [PMID: 25304092]
[http://dx.doi.org/10.1007/s13346-012-0060-8] [PMID: 25786721]
[http://dx.doi.org/10.18860/jip.v3i1.4993]
[http://dx.doi.org/10.3390/pharmaceutics13030410] [PMID: 33808836]
[http://dx.doi.org/10.1007/s12272-010-0708-1] [PMID: 20661712]
[http://dx.doi.org/10.1016/j.jddst.2020.102110]
[http://dx.doi.org/10.3390/molecules26082185] [PMID: 33920154]
[http://dx.doi.org/10.1016/j.ijpharm.2006.02.015] [PMID: 16600540]
[http://dx.doi.org/10.1080/10717544.2017.1365392] [PMID: 28831842]
[http://dx.doi.org/10.1016/j.ijpharm.2019.03.010] [PMID: 30851390]
[http://dx.doi.org/10.1016/j.colsurfb.2009.11.021] [PMID: 20042320]
[http://dx.doi.org/10.1021/acsomega.0c05033] [PMID: 33458508]
[http://dx.doi.org/10.1080/10942912.2018.1485032]
[http://dx.doi.org/10.17576/mjas-2017-2106-23]
[http://dx.doi.org/10.1208/s12249-011-9742-7] [PMID: 22187363]
[http://dx.doi.org/10.4103/0250-474X.106066] [PMID: 23439454]
[http://dx.doi.org/10.1080/21691401.2017.1389748] [PMID: 27600884]
[http://dx.doi.org/10.1016/S0378-5173(96)04791-6]
[http://dx.doi.org/10.2174/157341312801784258]
[http://dx.doi.org/10.1166/jnd.2013.1008]
[http://dx.doi.org/10.1016/S0378-5173(02)00632-4] [PMID: 12623186]
[http://dx.doi.org/10.1007/s40005-017-0327-7]
[http://dx.doi.org/10.1080/01932691003756910]
[http://dx.doi.org/10.2174/187221013804484827] [PMID: 22946628]
[http://dx.doi.org/10.2174/2210681209666181226153741]