藥師佛又稱作藥師如來、藥師琉璃光如來、大醫王佛、醫王善逝、十二願王,為佛教東方淨土琉璃世界教主。藥師佛於過去世行菩薩道時,曾發利益眾生的十二微妙上願,願所有聞名受持藥師如來名號的有情眾生,眾病悉除,身心安樂,受用無缺,解脫憂苦,証得無上菩提。藥師佛之誓願不可思議,若有人身患重病,死衰相現,其眷屬若能於此人臨命終時,晝夜盡心供養禮拜藥師佛,讀誦藥師如來本願功德經四十九遍,燃四十九燈,造四十九天之五色綵幡,其人得以延生續命。
Medicine Buddha, the Buddha of healing in Chinese Buddhism, is believed to cure all suffering (both physical and mental) of sentient beings. He is also known by other names, such as Bhaisajyaguru Tathagata, Bhaisajyaguru Lapis Lazuli Tathagata, the Great Medicine King Buddha, Great Healing King, and the Buddha of Twelve Great Vows.
When Medicine Buddha practices in his Bodhisattva ways, he made twelve great vows, wishing to relieve sentient beings from suffering, and let them to have sufficient capacities to enter the way of liberation. Those who follow his vows in the practice of Buddhahood can be reborn in his Lapis Lazuli Pure Land.