Can you fill this prescription for me?

你能替我配这个处方吗？

I have diarrhea. Do you have medicine for it?

我拉肚子，有什么药可以吃？

I feel very sore in my knees. What medicine shall I take?

我膝盖很疼，该吃点什么药？

I'd like some pain-killing drugs.

我想买点止痛药。

I want to buy some vitamins.

我想买些维生素。

Is this effective to cure cold?

这种药对治疗感冒有效吗？

Are these tablets availabe over the counter?

这些药片在柜台处可以买到吗？

Could you tell me how I take the medicine?

你能告诉我这药怎么服用吗？

How many times a day should I take this medicine?

这药一天吃几次？

Does this drug have any side effects?

这药有副作用吗？