投与

1. Origins, structure, and basic meaning

• Structure: 投与(とうよ) is a noun for administering something such as a drug to a recipient, used verbally as 投与する.
• Basic usage: In medical contexts it describes the act or timing of administering medication.

2. Common pitfalls and similar expressions

• Recipient and medication
  • In 患者に薬を投与した, に marks the recipient and を the medication administered. The word alone does not specify injection as the method.
• Perspective compared with 服用
  • 服用(ふくよう) describes taking medication from the recipient's side. 投与 focuses on administering it, so the perspectives differ.