CLINICAL TRIAL
JOURNAL ARTICLE
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Enhanced skin targeting of retinoic acid spanlastics: in vitro characterization and clinical evaluation in acne patients.

Acne vulgaris is the most common dermatological disorder affecting millions of individuals. Acne therapeutic solutions include topical treatment with retinoic acid (RA) which showed a good efficacy in treatment of mild and moderate cases. However, the high prevalence of adverse events, such as skin dryness, shedding and skin irritation affects the patient convenience and obstruct the acne treatment. Thus, the objective of this paper was to produce Span 60 based elastic vesicles enriched with penetration enhancers, and study their influence on the delivery of RA and its skin irritation. RA-loaded nanovesicles, enriched with Transcutol® /Labrasol® , were made using the thin film hydration technique, and assessed for entrapment efficiency, particle size and zeta potential. The optimized RA-loaded nanovesicles (composed of Span 60-Tween 20, and Transcutol® ) were morphologically assessed via transmission electron microscopy. Moreover, RA deposition into newborn mice skin was assessed in vitro under non-occlusive conditions, where the optimized RA-loaded nanovesicles showed 2-fold higher RA deposition in the skin compared to the corresponding one lacking Transcutol. The optimized RA-loaded nanovesicles incorporated into 1% carbopol gel was evaluated for in-vivo clinical performance in acne patients, and showed appreciable advantages over the marketed formulation (Acretin® ) in the treatment of acne regarding skin tolerability and patient's compliance.

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