两种情况：
作药、药物解的时候 是不可数名词；
作处方解的时候是 可数名词；
medication
n. 药;药物
复数： medications
He's very sick. He needs medication
他病得很厉害，需要药物治疗。
Are you currently taking any medication?
你在服用什么药吗？
She had managed perfectly well without medication for three years
3年来，她一直没有服药却挺了过来。
His doctor increased the dosage but did not change to a different medication
他的医生加大了剂量，不过没有换药。
It really is best to manage without any medication if you possibly can
如果你不服用任何药物就能挺过去的话，最好不过了。
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