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Tropical Journal of Pharmaceutical Research
Pharmacotherapy Group, Faculty of Pharmacy, University of Benin, Benin City, Nigeria
ISSN: 1596-5996
EISSN: 1596-5996
Vol. 14, No. 4, 2015, pp. 559-565
Bioline Code: pr15073
Full paper language: English
Document type: Research Article
Document available free of charge

Tropical Journal of Pharmaceutical Research, Vol. 14, No. 4, 2015, pp. 559-565

 en Avanafil Liposomes as Transdermal Drug Delivery for Erectile Dysfunction Treatment: Preparation, Characterization, and In vitro, Ex vivo and In vivo Studies
Hosny, Khaled Mohamed & Aldawsari, Hibah Mubarak


Purpose: To formulate avanafil, a recently approved phosphodiesterase-5 enzyme inhibitor, in liposomal form for enhanced transdermal permeation and bioavailability
Methods: Two preparation procedures were employed, leading to the formation of multilamellar vesicles (MLVs) and reverse-phase evaporation unilamellar vesicles (ULVs). The effects of the preparation method and lipid content on the encapsulation efficiency and particle size were studied. Studies assessing the stability, in vitro release, ex vivo permeation and in vivo bioavailability were also conducted in rats.
Results: The preparation of avanafil liposomes as MLVs, the addition of cholesterol, and the use of more rigid phospholipids all increased the avanafil encapsulation efficiency within the liposomes (95.61 %). The stability studies revealed that the liposomes prepared using phospholipids with higher transition temperatures (dipalmitoyl-L-α-phospatidylcholine) were significantly more stable for a longer period of time after storage at 25 ± 0.5 ˚C and 60 ± 5 % relative humidity for a period of 2 months (p < 0.05). In vivo pharmacokinetic results from rats showed a significant increase in the bioavailability of avanafil from transdermal liposomal formulations of up to 7-fold (p < 0.05) compared to the topical drug suspension.
Conclusion: The developed avanafil liposomes represent a promising transdermal drug delivery system for the treatment of erectile dysfunction.

Avanafil; Liposomes; Entrapment efficiency; Dipalmitoyl-L-α-phospatidylcholine; Erectile dysfunction

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