If you obtain all of your prescriptions from the same pharmacy, your pharmacist will be flagged of any contraindications (e.g. allergy or contraindication w/ current medication). . However, it is always a good idea to know, at a minimum at least the names of all medications (including prescription, over the counter, herbal, etc) that you are taking at any given time….so that you can share that info w/ all of your providers.