A prescription is an instruction from a prescriber to a dispenser. The prescriber is not always a doctor but can also be a paramedical worker, such as a medical assistant, a midwife or a nurse. The dispenser is not always a pharmacist, but can be a pharmacy technician, an assistant or a nurse. Every country has its own standards for the minimum information required for a prescription, and its own laws and regulations to define which drugs require a prescription and who is entitled to write it.
Many countries have separate regulations for opiate prescriptions.
There is no global standard for prescriptions and every country has its own regulations. The most important requirement is that the prescription be clear. It should be legible and indicate precisely what should be given. If you include the following information, not much can go wrong. This is usually pre-printed on the form.