Instruction is the term commonly used for printing labels with medicine dosage and other prescription information. If you are looking to provide such information about drugs, such as on the vials or information inserts, you should use "instructions".
On the other hand, "direction" is the term used when doctors give information to patients regarding how to behave or how to use drugs. For example, you can say: the doctor provided directions to his patient to not drink water for the next two hours.
Hope this helps you.
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024