As a Chinese herbal drug, Japanese plums blackened by smoking are called Ubai and are believed to have effects of calming gastric and intestinal disorders, vermifuge, haemostatis and cardiotonic.
漢方薬では燻蒸（くんじょう）して真っ黒になった実を烏梅（うばい）といい、健胃、整腸、駆虫、止血、強心作用があるといわれる。