yào / shī / rú / lái / de / běn / yuàn / shì / bāng / zhù / zhòng / shēng / tuō / lí / bìng / tòng / zhī / kǔ / 。

药师如来的本愿是帮助众生脱离病痛之苦。

The original vow of the Medicine Buddha is to help all beings get rid of the suffering of illness.