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Long-term stability of 0.1% rapamycin hydrophilic gel in the treatment of facial angiofibromas
  1. Guillaume Le Guyader1,
  2. Victoire Vieillard1,
  3. Karine Andrieux2,
  4. Mylène Rollo1,
  5. Olivier Thirion1,
  6. Pierre Wolkenstein3,
  7. Muriel Paul1
  1. 1 Pharmacy Department, Henri Mondor Hospital Group, AP-HP, Creteil, France
  2. 2 Unité de Technologies Chimiques et Biologiques pour la Santé (UTCBS), UMR CNRS 8258 U1022 INSERM, Université Paris Descartes, Paris, France
  3. 3 Department of Dermatology, Henri Mondor Hospital Group, AP-HP, Créteil, France
  1. Correspondence to Dr. Guillaume Le Guyader, Pharmacy Department, Henri Mondor Hospital Group, Créteil 94010, France; leguyader.guillaume{at}gmail.com

Abstract

Objectives In recent years, various formulations containing rapamycin, mainly petrolatum-based, have been tested on facial angiofibromas in tuberous sclerosis. They are often poorly tolerated due to irritation and bleeding. In addition, their effectiveness was insufficient in young adults. The objective of this study was to develop and characterise a hydro-alcoholic gel containing solubilised rapamycin. The stability of the product stored at 4°C was evaluated over 1 year.

Methods Two different 0.1% rapamycin gels were formulated with or without α-tocopherol and urea. Different methods were used to characterise the gels: HPLC, gas chromatography, pH, visual observation and optical microscopy. A physico-chemical and microbiological stability study was also conducted for 1 year at 4°C.

Results Gels were physically and microbiologically stable after 1 year at 4°C: organoleptic characteristics and pH unchanged, no significant decrease in rapamycin was observed, tocopherol droplet size was constant and rheological behaviour was not altered.

Conclusions This study describes a new gel formulation to improve skin penetration using various excipients to promote skin tolerance. This study provides, for the first time, detailed stability data for a hydro-alcoholic rapamycin gel.

  • rapamycin
  • topical formulation
  • tuberous sclerosis
  • stability
  • angiofibromas
  • hydrophilic gel

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