Nicander of Colophon (Ancient Greek: Νίκανδρος ὁ Κολοφώνιος Níkandros ho Kolophṓnios, 2nd century BC), Greek poet, physician and grammarian, was born at Claros, (Ahmetbeyli, Izmir in modern Turkey), near Colophon, where his family held the hereditary priesthood of Apollo. He flourished under Attalus III of Pergamum.He wrote a number of works both in prose and verse, of which two survive complete. The longest, Theriaca, is a hexameter poem (958 lines) on the nature of venomous animals and the wounds which they inflict. The other, Alexipharmaca, consists of 630 hexameters treating of poisons and their antidotes. Nicander's main source for medical information was the physician Apollodorus.