LEXICON
No.57 April 18, 2011

Yellow letter, formally called Dear-doctor letter;important drug warning
緊急安全性情報 (イエローレター);(ドクターレター)
Blue letter
安全性速報 (ブルーレター)

Korosho proposes that pharmaceutical companies issue yellow letters (緊急安全性情報 or イエローレター) when it is necessary to warn the public and healthcare professionals about a serious risk of a drug or medical device or to restrict its use on an emergency...

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