薬

1. Origins, structure, and basic meaning

• Structure: 薬 (くすり) is a single-character noun read くすり for medicine.
• Basic usage: It may be prescribed for use after meals and require storage in a cool, dry place.

2. Common pitfalls and similar expressions

• The noun does not supply dosage instructions
  • 薬 identifies medicine generally; dose, timing, and storage conditions must come from the prescription or label.