Abstract
The objective was to prepare a novel nail lacquer formulation to improve the ungual and trans-ungual delivery of apremilast for the potential treatment of nail psoriasis. Nail lacquer formulation was prepared using Eudragit® S 100 as a film-forming polymer and the mixture of ethanol, ethyl acetate, and water as a solvent system. As a result of high-throughput screening studies, dexpanthenol and salicylic acid were found to be the potential penetration enhancers. After 7 days of in vitro studies, the cumulative amount of apremilast delivered by the nail lacquer formulation across the nail plate was found to be ~3-fold (0.52 ± 0.07 μg/cm2) more compared to control (nail lacquer formulation without enhancers) (0.19 ± 0.02 μg/cm2). The cumulative amount of apremilast retained in the nail plate in the case of nail lacquer formulation was 1.26 ± 0.18 μg/mg which was found to be ~2-fold more compared to control (0.57 ± 0.07 μg/mg). Human subject studies were performed on the nails of thumb and index finger of six volunteers for 15 days. As a result, the cumulative amount of apremilast retained in the free distal edge of the nail plate in the case of nail lacquer was found to be ~2-fold (0.93 ± 0.14 μg/mg) more related to control (0.41 ± 0.04 μg/mg). As a conclusion, nail lacquer formulation was found to be capable of delivering a substantial amount of apremilast into the nail apparatus; thus, it can be a potential option for the treatment of nail psoriasis.
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Abbreviations
- Kolliphor® CS 20:
-
Polyoxyl 20 Cetostearyl Ether
- Kolliphor™ HS 15:
-
Polyoxyl 15 hydroxystearate
- Kolliphor™ RH 40:
-
Polyoxyl 40 hydrogenated castor oil
- Vitamin E TPGS:
-
Vitamin E polyethylene glycol succinate
- PEG 400:
-
Polyethylene glycol 400
- Kolliphor® EL:
-
Polyoxyl 35 castor oil
- HPMC:
-
Hydroxypropyl methyl cellulose
- Eudragit® S 100:
-
Methacrylic Acid - Methyl Methacrylate Copolymer (1:2)
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Kushwaha, A.S., Repka, M.A. & Narasimha Murthy, S. A Novel Apremilast Nail Lacquer Formulation for the Treatment of Nail Psoriasis. AAPS PharmSciTech 18, 2949–2956 (2017). https://doi.org/10.1208/s12249-017-0776-3
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DOI: https://doi.org/10.1208/s12249-017-0776-3