투약이 · 투약을
administration of medicine, dosing
Example
환자에게 정해진 시간마다 투약해야 합니다.
Medicine must be given to the patient at the set times.
Word parts
투 throw, give+약 medicine
Literally 'giving medicine'.
Good to know
투약 is what medical staff do; the patient's side is 복용 (taking medicine).