Acne vulgaris is a chronic inflammatory disorder of the pilosebaceous unit affecting approximately 85% of adolescents and young adults worldwide. Topical clindamycin phosphate remains a first-line treatment for inflammatory acne; however, its clinical utility is significantly compromised by poor follicular penetration due to the drug's hydrophilic nature (log P ≈ -0.8) and the formidable lipophilic barrier of the stratum corneum. This review critically examines the development of nanoemulgel formulations as an advanced topical delivery system for clindamycin phosphate, with particular emphasis on the strategic incorporation of tea tree oil as a functional oil phase possessing intrinsic anti-Cutibacterium acnes activity. The nanoemulgel hybrid system combines the enhanced penetration capabilities of nanoemulsions (droplet size 20- 200 nm) with the rheological and aesthetic benefits of hydrogels. Key mechanisms of enhanced delivery include transfollicular targeting, surfactant-mediated lipid bilayer disruption, and penetration enhancement by natural oil constituents. The synergistic potential between clindamycin and tea tree oil components, with fractional inhibitory concentration indices of 0.3- 0.5, permits dose reduction of the antibiotic by 60-80% while maintaining antimicrobial efficacy. This review synthesizes current literature on formulation strategies, characterization techniques, stability studies, and clinical evidence, while identifying critical research gaps and future prospects for this green nanotechnology-enabled approach to acne therapy.
Tripathi et al. (Wed,) studied this question.