JPWO2011010645A1 - フェンタニル含有外用貼付剤 - Google Patents
フェンタニル含有外用貼付剤 Download PDFInfo
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- A61K9/7023—Transdermal patches and similar drug-containing composite devices, e.g. cataplasms
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- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
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Abstract
Description
一方、主基剤にスチレン・イソプレン・スチレンブロック共重合体(SIS)を用いたフェンタニル含有貼付剤(SIS系製剤)も開示されている(特許文献2及び特許文献3)が、結晶を析出することなく長期間保存でき、かつ使用時において長時間に亘り安定的な皮膚粘着性及び主薬放出性を充足する貼付剤は見当たらない。
また軟化剤として配合される、流動パラフィンとポリブテンの配合比を0.5:1〜3:1の範囲にすることにより、皮膚に対する低い刺激性と、製剤中での主薬溶解性のバランスがとれた外用貼付剤を得ることができる。
さらに本発明の外用貼付剤に用いる粘着付与樹脂はロジン系樹脂とテルペン樹脂の2種を配合することにあり、一方のロジン系樹脂としては、ロジンエステル、水添ロジン、グリセリンロジンエステル、水添ロジングリセリンエステル、ロジン酸、重合ロジンなどが挙げられるが、特に、水添ロジングリセリンエステルが好ましい。ロジン系樹脂は粘着剤層全体の重量に対して20〜40重量%、より好ましくは25〜35重量%の割合で配合される。ロジン系樹脂の配合量が20重量%以下の場合、薬物溶解性が低下し、主薬成分の結晶化等、製剤物性に対する好ましくない影響が出る。また40重量%以上配合された場合には薬物の皮膚透過性が低下する。
そして、テルペン樹脂は粘着剤層全体の10〜30重量%、より好ましくは10〜25重量%の割合で配合される。テルペン樹脂の配合量が10重量%以下であると薬物の皮膚透過性が低下し、30重量%以上配合されると主薬成分の結晶化等、製剤物性に対する好ましくない影響が出る。
また、本発明におけるロジン系樹脂とテルペン樹脂の配合比率はロジン系樹脂:テルペン樹脂=4:1〜1:1の範囲であることが好ましい。より好ましくは3:1.5〜3:1である。ロジン系樹脂が4:1より多いと薬物の皮膚透過性が低下し、逆に1:1より少ないと主薬成分の結晶化等、製剤物性に対する好ましくない影響が出る。
流動パラフィン及びポリブテンのフェンタニル溶解性は、ポリブテン>流動パラフィンであり、製剤中の主薬の溶解性を調節することもできる。その配合比は、好ましくは流動パラフィン:ポリブテン=0.5:1〜3:1、より好ましくは1:1〜2:1である。流動パラフィンの配合量が、3:1より多いと製剤中のフェンタニル溶解性が低下し、主薬の結晶化等好ましくない影響が出、さらに製剤の皮膚への接着性が低下する。また0.5:1より少ないと、粘着力が強くなりすぎ、皮膚刺激が強くなる。
本発明の外用貼付剤の粘着層には、主薬成分の安定性を調整するため抗酸化剤を添加することができる。抗酸化剤としては具体的にはジブチルヒドロキシトルエン(BHT)、アスコルビン酸等が例示されるがBHTが好ましい。本発明に配合されるBHTの配合量は0.1〜5重量%であり、好ましくは0.5〜2重量%配合される。
粘着付与剤を含む基剤成分にトルエン等の有機溶媒を加え溶解した後、適当な有機溶媒に溶解させた他の成分と攪拌混合する。得られた溶液をシリコン処理された剥離ライナー上に塗布し、90℃で10分間乾燥し、20〜100μmの粘着層を形成する。得られた粘着層に支持体のポリエチレンテレフタレートフィルムをラミネートした後、適当な大きさと形状に切断して本発明の外用貼付剤を得ることができる。
フェンタニルの薬物放出性を検討するため、実施例1、及び比較例1につきヘアレスマウスにおけるin vitro皮膚透過性試験を行った。背部摘出皮膚をフランツ型セルにセットし、その内側にはリン酸緩衝生理食塩水を満たし、ウォータージャケットには、37℃の温水を還流した。各製剤を円状(φ16mm)に打ち抜き、摘出皮膚を貼付し、経時的にレセプター液をサンプリングし、液体クロマトグラフ法によりフェンタニル透過量を測定し、透過速度を計算した。その結果を、図1に示す。
実施例1、6〜9及び比較例3〜8について引っ張り試験器(レオメーターCR500DX サン科学社製)を用い、180°剥離試験を行うことにより粘着力を評価した。その結果を表6に示す。
表5〜6、及び図1に示す結果より、本発明の外用貼付剤は優れた薬物放出性、安定性、および粘着力を兼ね備えた貼付剤であることが判明した。一方、比較例1は主薬の放出性において本発明より劣ること、比較例2、3、4及び7は製剤中での主薬の結晶化の問題があること、および比較例3、4、5、7は本発明と比較して粘着性が非常に低いことが判明した。また、比較例6及び8は本発明と比較して粘着性が非常に高く、皮膚刺激性が懸念されるものである。
実施例1及び市販品(アクリル粘着剤にフェンタニルを配合した貼付剤)についてフェンタニルのウサギ血漿中濃度測定試験を行った(フェンタニルの投与量各々4.2mg)。それぞれの貼付剤を除毛したウサギ背部に72時間貼付し、経時的に採血し、液体クロマトグラフィー/マススペクトル法(LC/MS)により血漿中のフェンタニル濃度を測定した。その結果を図2に示す。本実施例の外用貼付剤は、市販品と比較して、速やかにフェンタニル血中濃度が上昇し、長時間にわたって高いフェンタニル血中濃度を維持できる優れた持続性を示す貼付剤であることが判明した。
Claims (3)
- スチレン・イソプレン・スチレンブロック共重合体を粘着剤層全体の重量に対して5〜50重量%、ロジン系樹脂とテルペン樹脂からなる粘着付与樹脂を粘着剤層全体の重量に対して30〜60重量%、ポリブテンと流動パラフィンからなる軟化剤を粘着剤層全体の重量に対して5〜40重量%配合した粘着剤層に、有効成分としてフェンタニルを配合してなるフェンタニル含有外用貼付剤。
- ロジン系樹脂の配合量が粘着剤層全体に対して20〜40重量%、そしてテルペン樹脂の配合量が粘着剤層全体に対して10〜30重量%である請求項1に記載のフェンタニル含有外用貼付剤。
- ロジン系樹脂が水添ロジングリセリンエステルである請求項1または2に記載のフェンタニル含有外用貼付剤。
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