Career
Themison was a native of Laodicea in Syria, and a pupil of Asclepiades of Bithynia. Nothing more is known about the events of his life except that he seems to have travelled a great deal. As he mentions Crete and Milan, apparently as an eye-witness.
Neither is it certain if he ever visited Rome, though it is perhaps more probable that he did southern
He wrote several medical works, but in what language is not mentioned. Of these only the titles and a few fragments remain, preserved principally by Caelius Aurelianus, for example: Libri Periodici.
Epistolae in at least nine books Celeres Passiones in at least two books
Tardae Passiones in at least two books
Liber Salutaria. De Plantagine. He was perhaps the first physician who made use of leeches, and he is said to have been attacked with hydrophobia, and to have recovered. Eudemus and Proculus are said to have been followers (Latin: sectatores) of Themison, which may only mean that they belonged to the Methodic school.
Themison was criticized by Soranus for his cruel handling of mental patients.
Among his prescriptions were darkness, restraint by chains, and deprivation of food and drink. Juvenal satirized him and suggested that he killed more patients than he cured, but whether he means this Themison or some contemporary is unknown.