Li Bian
Late in his reign, Li Bian often took medication made by the alchemist Shi Shouchong (), which he believed to be able to enhance health, but which in actuality changed his disposition such that he became harsher and less patient. At one point, he gave some of the medication to Li Jianxun as a gift. Li Jianxun later stated to him, "I, your subject, took it for several days, and I felt overactive and having hot flashes. How could it be that it could be taken more than that?" Li Bian responded, "I have been taking it for a long time," and did not heed Li Jianxun's warnings. The medication ended up damaging Li Bian's health and, in 943, he died, and was succeeded by Xu Jingtong, whose name had been changed to Li Jing.