良药

good medicine / panacea / fig. a good solution / a good remedy (e.g. to a social problem)

leaf of the iris / variant of 藥|药[yao4]

medicine / drug / substance used for a specific purpose (e.g. poisoning, explosion, fermenting) / CL:種|种[zhong3],服[fu4],味[wei4] / to poison

good / very / very much

good medicine tastes bitter (idiom); fig. frank criticism is hard to swallow