n. 无效果, 无疗效

[医] 无效, 无效力

[ noun ]
a lack of efficacy
<noun.attribute>

Inefficacy \In*ef"fi*ca*cy\, n. [L. inefficacia. See {In-} not,
and {Efficacy}.]
Lack of power to produce the desired or proper effect;
inefficiency; ineffectualness; futility; uselessness;
fruitlessness; as, the inefficacy of medicines or means.

The seeming inefficacy of censures. --Bp. Hall.

The inefficacy was soon proved, like that of many
similar medicines. --James
Gregory.