Yīshēng wèi tā kāi le yì zhǒng kàngshēngsù zhùshèjì.
The doctor prescribed him an antibiotic injection.
Tips
usage
剂 is a classifier/suffix for pharmaceutical preparations: 注射剂 injection, 片剂 tablet, 胶囊剂 capsule, 糖浆剂 syrup. Distinct from 针剂, a more colloquial term for injection.