法華義疏 1.328

1.328

「藥王」者，過去世以藥救病，因以為名。但菩薩有二種身：一、如意珠王身，能與一切樂，依此立名故云寶掌也。二、藥樹王身，見聞之者無不苦滅，依此立名稱藥王也。

'Bhaiṣajyarāja' (Medicine King): in a past life he cured illnesses with medicine, and took his name from that. However, a bodhisattva has two kinds of bodies: First, the wish-fulfilling jewel-king body, able to bestow all happiness; being named based on this, he is called Ratnapāṇi. Second, the medicinal tree-king body; whoever sees or hears it has all suffering extinguished; being named based on this, he is called Bhaiṣajyarāja.