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IV型NACがFDAにより、アセトアミノフェンの過剰摂取後の肝障害を予防・軽減するためのsNDAを受理される

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2025年11月2日
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IV型NACがFDAにより、アセトアミノフェンの過剰摂取後の肝障害を予防・軽減するためのsNDAを受理される
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FDAは、注射用N-アセチルシステイン(NAC、Acetadote; カンバーランドファーマシューティカルズ)の補足新薬申請(sNDA)を承認しました。この静脈内(IV)製剤は、OTCの鎮痛剤および解熱剤であるアセトアミノフェンの潜在的に有毒な量の摂取後に肝障害を防ぐまたは軽減するために使用されます。専門家によると、アセトアミノフェンは米国における急性肝不全の主要な原因です。毎年、数千人の米国人が偶発的または意図的にアセトアミノフェン中毒を経験し、これが深刻な肝損傷につながる可能性があります。

新しいNACの投与法は、標準的な投与法の最初の2袋をより遅い単一の注入に統合することで、投与を簡素化します。この新しいアプローチは、専門家によると、病院で実施されており、薬剤エラーの頻度を減少させる能力や、NACの有効性を損なうことなく、潜在的に深刻な非アレルギー性アナフィラクトイド反応(NAARs)を減少させることが示されています。この新しいNAC投与法の簡素化により、医療従事者は命を救う治療をより効率的に行い、患者の転帰を改善する可能性があります。

「このFDAの[sNDA]承認は、アセトアミノフェン過剰摂取の治療において重要な前進です」と、ロッキー山毒物および薬物センターのディレクターであるリック・ダート医師はニュースリリースで述べました。「NACの投与を簡素化することで、患者の転帰を改善し、有害事象(AEs)のリスクを減少させることができます。この簡素化された投与法は、この潜在的に命に関わる状態を管理するための医療提供者にとって貴重なツールです。」

2022年に『Clinical Toxicology』(フィラデルフィア)に発表された後ろ向きコホート研究の結果は、IV NACの2日間の投与法がアセトアミノフェン(研究ではパラセタモールと呼ばれる)過剰摂取の患者を治療する際に、著しく少なく、短い遅延と関連していることを示しました。2009年10月から2013年10月までの3袋の投与法で治療された患者(n = 271)と、2014年2月から2020年5月までの2袋の投与法で治療された患者(n = 598)を比較しました。各注入の開始時間は医療記録から取得され、遅延は実際の注入時間と処方された時間を比較することで計算されました。さらに、消化器系反応や皮膚および全身のNAARsを含むAEsの証拠も記録されました。

2袋の方法が少なく、はるかに短い遅延(中央値の遅延:35分 [IQR: 15, 70] 対 65分 [IQR: 40, 105]、P < .01)をもたらすことがわかり、1時間を超える遅延は少なく(2袋:31%、3袋:51%; P < .01)なりました。NAARsは両方のコホートで著しく長い遅延と関連していることが観察されましたが、3袋のコホートでより頻繁に発生しました。

さらに、『Annals of Pharmacotherapy』に発表された類似の後ろ向きコホート研究では、小児患者におけるアセトアミノフェン毒性のための3袋と2袋のNAC投与法を比較し、主要な結果は発生率でした。

NAC N-acetyl cysteine

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