noun
A substance or treatment given more for psychological comfort than for real medical effect. Often used figuratively for any empty reassurance.
See also: 偽薬
医者は患者に気休め薬を処方した。
The doctor prescribed a placebo for the patient.
彼の励ましは単なる気休め薬に過ぎなかった。
His encouragement was nothing more than a placebo.