Uv-stable, liquid or semisolid transdermal administration...

A - Human Necessities – 61 – K

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A61K 9/00 (2006.01)

Patent

CA 2548739

The invention relates to semisolid and liquid pharmaceutical administration forms for transdermal application containing a pharmaceutical active ingredient which is photosensitive in the UV range and at least one UV light-absorbing excipient (UV absorber), this being present dissolved or dispersed in the administration form. Advantageously, the administration form according to the invention relates to transdermal gels whose gel base is composed of water, alcohol, at least one gel-forming polymer and optionally further ingredients. Such gels are also designated as hydroalcoholic gels. An administration form containing a photosensitive pharmaceutical active ingredient is made available, the application system realizing a high stability without the disadvantages known when using the conventional semisolid transdermal application forms. At the same time, the harmful concomitant effects, such as, for example, absorption of lightscreen substances into the body possibly resulting from the intentional light protection for the user, are kept as low as possible.

La présente invention a trait à des formulations d'administration pharmaceutiques semi-solides ou liquides pour une application transdermique, comportant un principe actif pharmaceutique qui est photosensible dans le spectre UV et au moins un adjuvant d'absorbance UV (absorbant d'ultraviolet), celui-ci étant dissous ou dispersé dans la formulation d'administration. De préférence, la formulation d'administration de l'invention est un gel transdermique, dont le gel est constitué d'eau, d'alcool, d'au moins un polymère gélifiant et éventuellement des ingrédients supplémentaires. Des gels de ce type sont également désignés gel hydroalcooliques. L'invention fournit une formulation d'administration comportant un principe actif photosensible, qui permet le système d'application de présenter une stabilité élevée sans les désavantages qui sont présents lors de l'application de formulations transdermiques semi-solides classiques. Ainsi, les effets indésirables concomitants, tels que l'absorption de substances de protection contre la lumière par l'organisme, qui peuvent résulter potentiellement de mesures délibérées de protection contre la lumière, sont maintenus à un minimum absolu.

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