剤 — “Dose / Medicine / Drug” in Japanese

Master (高手)ざい, すい, せい, かる, けず

Radical ⼑ · radical 18 The building block this kanji is filed under

“Dose / Medicine / Drug” in Japanese is 剤, read zai, sui, sei (ざい, すい, せい, かる, けず). It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 洗剤 (detergent).

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What does 剤 mean?

Full details, readings & example

Kanji	剤
Meaning	Dose / Medicine / Drug
Readings	ざい, すい, せい, かる, けず
Grade	Master (高手 · secondary school)
Curriculum	Jōyō kanji · Japanese secondary school (JLPT N1–N2)
Example	洗剤 (detergent)

How to read 剤

剤 is read zai (ざい) or sui (すい) or sei (せい) or karu (かる) or kezu (けず) depending on the word.

Words with 剤

洗剤

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Kanji read the same way as 剤

Same sound, different character — the classic trap. Compare them side by side:

Updated: 2026-08-28