medicator
/ˈmɛdɪkeɪtə/noun
1A person who provides medical treatment; a person who administers or prescribes drugs or other medication.
- Earlier in self-medicator..
2A device for introducing a drug or other substance into a liquid supply line in controlled amounts (e.g. in automated systems for keeping livestock).
Origin
Mid 19th century (in an earlier sense). From medicate + -or.