subtherapeutic
adjective
- be at a suboptimal or sub-beneficial level of treatment
Wiktionary
adj
Etymology: Etymology tree Proto-Indo-European *upó Proto-Italic *supo Latin sub Latin sub-der. English sub- English therapeutic English subtherapeutic From sub- + therapeutic.
- Administered at levels lower than would be used in actual treatment of a disease
“[…] they require that the pigs be humanely raised and free of subtherapeutic antibiotics. “”