(Λυσίμαχος), of Cos, a physician, who wrote a commentary on the works of the Hippocratic Collection in three books, addressed to Cydias, a follower of Herophilus, and another in four books, addressed to Demetrius (Erotian. Gloss. Hippoer. p. 10), neither of which is now extant. If this Demetrius was the physician born at Apameia, Lysimachus probably lived in the third and second centuries B. C.