Identifying medicines is not easy. Here you will find all the answers to your questions. If you do not find the answer to your question here, please do not hesitate to contact us at firstname.lastname@example.org Do all medications have to have a serial number? No, only medications that fall under the FMD legislation. Do I need to allocate a new GTIN if I change my packaging or change something in my product? Please refer to HC's specific GTIN allocation rules. Read the manual or check the interactive tool.