Medical term for a substance that induces vomiting. The synonym 吐剤 (とざい) is also used.
See also: 吐剤
An emetic was administered to the poisoned patient.
Compound of 催吐 (さいと, 'inducing vomiting') + 薬 (やく, 'medicine'). The exact historical derivation is uncertain, but the term is a straightforward medical coinage.