Abstract
Transdermal drug delivery systems (TDDS) provide a non-invasive alternative to conventional dosing but are often restricted by the skin’s primary barrier, the stratum corneum. This review evaluates second- and third-generation ultradeformable vesicles—transfersomes and ethosomes—designed to overcome these limitations. Transfersomes utilize edge activators to achieve extreme elasticity, allowing them to squeeze through narrow pores via a transdermal osmotic gradient. Conversely, ethosomes leverage high ethanol concentrations to fluidize skin lipids, facilitating deep penetration through a "push-pull" mechanism. The review compares their composition, mechanisms, and applications in delivering diverse therapeutic agents, including proteins and lipophilic drugs. While challenges such as physical instability and regulatory hurdles remain, emerging hybrid systems like transethosomes and integration with microneedles represent the future of efficient, localized, and systemic transdermal therapy.
Keywords
Transdermal Drug Delivery,Transfersomes,Ethosome,Vesicle,Stratum Corneum
Introduction
Overview of Transdermal Drug Delivery Systems (TDDS)
Transdermal drug delivery systems (TDDS) are designed to transport therapeutic agents across the skin and into the systemic circulation (1). These systems offer a non-invasive alternative to oral and parenteral routes, providing sustained and controlled drug release (4). By maintaining constant drug levels in the plasma, TDDS can eliminate the "peaks and valleys" associated with conventional dosing, thereby improving therapeutic outcomes (3).
Limitations of Conventional Transdermal Formulations
The primary challenge for any TDDS is the stratum corneum (SC), the skin's outermost layer, which acts as a formidable physiological barrier (1). Conventional formulations are often restricted by:
- Physicochemical Constraints: Passive diffusion is generally limited to molecules with a molecular weight of less than 500 Daltons and moderate lipophilicity (Log P 1–3) (1, 2).
- Low Permeability: Many active pharmaceutical ingredients (APIs) cannot permeate the skin at therapeutic rates, leading to poor bioavailability (1, 4).
- Skin Irritation: Some chemical enhancers used in traditional patches can cause localized irritation or damage to the skin's lipid barrier (1, 3).
Need for Vesicular Carrier–Based Enhancement Strategies To broaden the range of drugs that can be delivered transdermally—including hydrophilic compounds and large macromolecules—researchers have turned to vesicular carriers (3). These nanostructured systems can encapsulate drugs, protect them from degradation, and facilitate their transport through the skin's "brick and mortar" structure (5). Emergence of Ultra deformable Vesicles: Transfersomes and Ethosomes. Standard liposomes often fail to penetrate deep skin layers, instead remaining trapped in the upper stratum corneum (3). This led to the development of ultra-deformable vesicles (UDVs):
- Transfersomes: Second-generation elastic vesicles composed of phospholipids and edge activators (surfactants like Tween 80). These surfactants destabilize the lipid bilayer, allowing the vesicle to become highly flexible (2, 3).
- Ethosomes: Third-generation vesicles characterized by a high concentration of ethanol (20–50%). Ethanol fluidizes both the vesicle membrane and the skin's intercellular lipids, significantly increasing penetration depth (2, 4).
Scope and Objectives of the Review
The objective of this review is to provide a comprehensive analysis of transfersomes and ethosomes as advanced transdermal platforms. It explores:
- The mechanistic insights into how these vesicles navigate the skin barrier.
- The comparative evaluation of their efficiency in delivering diverse drug types (hydrophilic vs. lipophilic).
- Recent innovations, such as transethosomes, which combine the advantages of both systems for superior skin flux (2, 5).
2. Skin Barrier and Challenges in Transdermal Drug Delivery
Anatomy and Physiology of Skin
The skin is the largest organ of the human body, serving as a protective shield against environmental insults. It is composed of three primary integrated layers:
- Epidermis: The outermost non-vascular layer, containing melanocytes and keratinocytes.
- Dermis: A thick layer of connective tissue containing blood vessels, hair follicles, sweat glands, and nerve endings.
- Hypodermis (Subcutaneous layer): The deepest layer consisting of adipose (fat) tissue that provides insulation and mechanical protection (6).
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- Rai, S., Pandey, V., & Rai, G. (2017). Transfersomes as versatile and flexible nano-vesicular carriers in skin cancer therapy: The state of the art. Nano Reviews & Experiments, 8(1), 1325708.
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- Ascenso, A., et al. (2015). Development, characterization, and skin delivery studies of related ultradeformable vesicles: transfersomes, ethosomes, and transethosomes. International Journal of Nanomedicine, 10, 5837–5851. https://doi.org/10.2147/ijn.s86186
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- Witika, B. A., et al. (2026). The future of vesicular drug delivery: Transferosomes in therapeutic advancement—applications, innovations and challenges. Journal of Drug Delivery Science and Technology, 91, 12777116.
- Garg V., Singh, H., & Beg, S. (2025). Evolution of ethosomal systems for the delivery of diverse therapeutic agents. Drug Delivery and Translational Research, 15(2), 442-460. https://doi.org/10.1007/s13346-024-01612-4
- Chauhan, N. (2017). An updated review on transfersomes: A novel vesicular system for transdermal drug delivery. Universal Journal of Pharmaceutical Research, 2(4), 49–52.
- Sharma, G., et al. (2026). Phytopharmaceutical delivery through ethosomes: A focus on antioxidant compounds. Phytomedicine Plus, 6(1), 100412.
- Opatha, S. A. T., Titapiwatanakun, V., & Chutoprapat, R. (2020). Transfersomes: A promising nanoencapsulation technique for transdermal drug delivery. Pharmaceutics, 12(9), 855. https://doi.org/10.3390/pharmaceutics12090855
- Sivadasan, D., & Madkhali, O. A. (2024). The design features, quality by design approach, characterization, therapeutic applications, and clinical considerations of transdermal drug delivery systems—a comprehensive review. Pharmaceuticals, 17(10), 1346. https://doi.org/10.3390/ph17101346
- Opatha, S. A. T., Titapiwatanakun, V., & Chutoprapat, R. (2020). Transfersomes: A promising nanoencapsulation technique for transdermal drug delivery. Pharmaceutics, 12(9), 855. https://doi.org/10.3390/pharmaceutics12090855
- Abdulbaqi, I. M., Darwis, Y., Khan, N. A. K., Assi, R. A., & Khan, A. A. (2016). Ethosomal nanocarriers: The impact of constituents and formulation techniques on ethosomal properties, in vivo studies, and clinical efficacy. International Journal of Nanomedicine, 11, 2279-2304. https://doi.org/10.2147/IJN.S105016
- Witika, B. A., et al. (2026). The future of vesicular drug delivery: Transferosomes in therapeutic advancement—applications, innovations and challenges. Journal of Drug Delivery Science and Technology, 91, 12777116.
- Zhan, B., et al. (2024). Ethosomes: A promising drug delivery platform for transdermal application. Chemistry, 6(5), 993–1019. https://doi.org/10.3390/chemistry6050058
- Sivadasan, D., & Madkhali, O. A. (2024). The design features, quality by design approach, characterization, therapeutic applications, and clinical considerations of transdermal drug delivery systems—a comprehensive review. Pharmaceuticals, 17(10), 1346. https://doi.org/10.3390/ph17101346
- Shingade, G. M. (2023). A review on: Transdermal drug delivery system. International Journal of Research Publication and Reviews, 4(5), 4503-4512.
- Garg, V., Singh, H., & Beg, S. (2025). Evolution of ethosomal systems for the delivery of diverse therapeutic agents. Drug Delivery and Translational Research, 15(2), 442-460. https://doi.org/10.1007/s13346-024-01612-4
- Iizhar, S. A., Syed, M. A., Khan, S., & Baboota, S. (2026). Ethosomes: A review on the novel vesicular system for transdermal drug delivery. Nanomedicine Journal, 13(1), 12-28.
- Akiladevi, D., & Basak, S. (2025). Ethosomes - A noninvasive approach for transdermal drug delivery system. International Journal of Current Pharmaceutical Research, 17(1), 1-8.
Vaishnavi Gaddam
Corresponding author
Department of Pharmaceutics, D. K. Patil Institute of Pharmacy, Loha Nanded India 431708
Vaishnavi Gaddam*, Transfersomes and Ethosomes for Enhanced Transdermal Drug Delivery: Mechanistic Insights and Comparative Evaluation, Int. J. Sci. R. Tech., 2026, 3 (2), 65-80. https://doi.org/10.5281/zenodo.18519387