“medicine” in Japanese is 薬, read yaku, kusuri (やく, くすり). It is a Grade 3 Kyōiku kanji, taught in year 3 of Japanese elementary school, and appears in words such as 薬局 (pharmacy).
What does 薬 mean?
かぜの薬を飲む。
Same sound, different character — the classic trap. Compare them side by side: