A qualified pharmacist explains how to take the medicine your doctor has prescribed: how many times a day, before or after food, for how long and how to store it. They can check whether a new medicine is compatible with the medicines and supplements you already take, and refer you to a doctor if there is any doubt. The pharmacist does not change treatment prescribed by a doctor. Any change of dose or medicine is decided by the doctor. Sometimes you may be given a medicine from a different manufacturer, with the same active ingredient and strength, but under a different name and in different packaging. Do not take this medicine together with the medicine from your previous pack. If you are unsure, ask the pharmacist.