Topical treatment is the cornerstone in the treatment of various cutaneous disorders such as acne, psoriasis, eczema, atopic dermatitis, leprosy, vitiligo, and ichthyosis. It offers advantages such as a large surface area, ease of use, minimal systemic exposure, and better patient compliance. However, the stratum corneum limits the permeability of active pharmaceutical ingredients (APIs), influenced by their molecular weight and lipophilicity. Traditional topical dosage forms, such as gels, creams, and lotions, often cannot be used due to the unsuitable physicochemical properties of APIs, making it difficult to penetrate the stratum corneum barrier. Additionally, creating stable formulations requires incorporating various excipients alongside APIs, which adds to the complexity of formulation. Strategies to address these challenges and improve the safety and efficacy of topical treatments include the development of novel drug delivery systems. These systems enhance drug delivery without compromising skin barrier integrity, improve API stability, and reduce side effects, thereby enhancing patient compliance. Novel approaches offer significant advantages over conventional forms, including enhanced drug penetration, reduced skin irritation, and improved stability. Delivery systems like liposomes and microemulsions may address stability issues associated with emulsion-based topical dosage forms, while organogels and hydrogels overcome viscosity challenges in suspensions. However, delivery systems like cyclodextrins and polymeric micelles, despite their benefits, can also face drawbacks. Developing effective topical dermatological products thus requires innovative approaches to overcome these limitations and enhance therapeutic effectiveness. This chapter will explore a range of novel topical delivery systems, including foams, organogels, hydrogels, microsponges, liposomes, microemulsions, solid lipid nanoparticles, dendrimers, and nanofibers. It will discuss formulation aspects and distinctive advantages, highlighting how these systems enhance drug penetration, improve stability, reduce skin irritation, and overcome the limitations of traditional formulations. Additionally, the chapter discusses the interaction of these novel formulations with the skin and their impact on the drug release rate for optimal absorption, ultimately contributing to more effective and patient-compliant dermatological treatments.

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Novel Formulation Approaches in the Topical Delivery System

  • Nisha Shrestha,
  • Ajay K. Banga

摘要

Topical treatment is the cornerstone in the treatment of various cutaneous disorders such as acne, psoriasis, eczema, atopic dermatitis, leprosy, vitiligo, and ichthyosis. It offers advantages such as a large surface area, ease of use, minimal systemic exposure, and better patient compliance. However, the stratum corneum limits the permeability of active pharmaceutical ingredients (APIs), influenced by their molecular weight and lipophilicity. Traditional topical dosage forms, such as gels, creams, and lotions, often cannot be used due to the unsuitable physicochemical properties of APIs, making it difficult to penetrate the stratum corneum barrier. Additionally, creating stable formulations requires incorporating various excipients alongside APIs, which adds to the complexity of formulation. Strategies to address these challenges and improve the safety and efficacy of topical treatments include the development of novel drug delivery systems. These systems enhance drug delivery without compromising skin barrier integrity, improve API stability, and reduce side effects, thereby enhancing patient compliance. Novel approaches offer significant advantages over conventional forms, including enhanced drug penetration, reduced skin irritation, and improved stability. Delivery systems like liposomes and microemulsions may address stability issues associated with emulsion-based topical dosage forms, while organogels and hydrogels overcome viscosity challenges in suspensions. However, delivery systems like cyclodextrins and polymeric micelles, despite their benefits, can also face drawbacks. Developing effective topical dermatological products thus requires innovative approaches to overcome these limitations and enhance therapeutic effectiveness. This chapter will explore a range of novel topical delivery systems, including foams, organogels, hydrogels, microsponges, liposomes, microemulsions, solid lipid nanoparticles, dendrimers, and nanofibers. It will discuss formulation aspects and distinctive advantages, highlighting how these systems enhance drug penetration, improve stability, reduce skin irritation, and overcome the limitations of traditional formulations. Additionally, the chapter discusses the interaction of these novel formulations with the skin and their impact on the drug release rate for optimal absorption, ultimately contributing to more effective and patient-compliant dermatological treatments.