良药的英文：
good medicine
effective medicine

参考例句：

Various herbs are blended in to make a good medicine for colds.
把几种药草混合起来使之成为一种治疗感冒的良药。

A good remedy for a cold
治疗感冒良药

Time is a great healer
时间就是良药

Aspirin is a good stand-by for headaches.
阿司匹林是必备的头痛良药.

There is still no cure for the common cold
目前仍没有治愈感冒的良药

jogging as an antidote to nervous tension.
慢跑是消除精神紧张的一剂良药

A faithful friend is the medicine of life. -- William Shakespeare
忠实的朋友是人生的良药。--莎士比亚

Sleeping is the best cure for waking troubles
睡眠是良药,专治醒时愁

Sleeping is the best cure for waking troubles.
睡眠是治疗一切醒时烦忧的良药。

Love is said to be a good remedy for emotional trauma.
人们说，爱是治愈心灵创伤的良药。

good是什么意思：
adj. 好的；令人满意的；愉快的；仁慈的
n. 好处；利益；有道德的人或事
adv. 好

A good appetite is a good sauce
饥不择食

The prompt goods have good qualities.
当场付款的物品质量不错。

Be not simply good; be good for something.
不要单纯做个好人，还要做个能派上用场的人。

medicine是什么意思：
n. 药；医学；内科；巫术
v. 用药物治疗；给…用药

There is no medicine to cure a fool || There is no medicine for curing a fool
笨人无药可医

Combine Chinese traditional medicine with western medicine
使中医与西医相结合。

The medicine is requested to pestle into powder.
这种药要研成粉末服用。