Why have I received an invoice for medicines that the doctor at the GP medical post has administered to me?

Your situation was such that the medicines had to be administered immediately during the consultation at the GP medical post or at your home. It concerned medicines that fall into the category for which payment must be made. Your details have therefore been passed on to the pharmacy afterwards, so that invoicing can take place. In this case, you could not go to the pharmacy yourself to collect the medicines and receive the invoice.