noun
document containing instructions; written directions
General term for a document that provides instructions or directions, such as how to take medicine or how to use something.
薬局で薬の飲み方の方書きをもらった。
I received a document with instructions on how to take the medicine at the pharmacy.
noun
Medical context: a written order for medicine or treatment, often from a doctor.
医者が方書きを書いてくれたので、それを持って薬局に行った。
The doctor wrote me a prescription, so I took it to the pharmacy.