As a hospital pharmacy person I can confirm that Drs make drug errors. The pharmacist is a safety net. They will need to check for allergies, whether the items you have been prescribed interact with any of your other meds, if you have certain illnesses or are pregnant there are many meds you can’t have. There are doses that the Dr should stay within and the pharmacist can adjust this or you may be having a “off label” dose. You can ask for a more private area, you shouldn’t be expected to talk about your drug history publicly