Question

what is a written request from a doctor to a pharmacist about the preparation and dispensing of medicines? instruction order advice prescription

Explanation:

A prescription is a written order from a doctor to a pharmacist for the preparation and dispensing of medicines. It contains details such as the patient's name, the name of the medicine, dosage, and instructions for use. An instruction is a general direction, an order is a command (but not specific to medicine dispensing in this context), and advice is a recommendation (not a formal written request for medicine as per the question).

Answer:

Prescription