I work at Multiple practices do I need an eRx ID for each practice? Each prescriber in a practice needs to register individually. If you work in more than one practice, you will need to register multiple times. eRx applications take approx. 1 to 3 days to process, and eRx will send you an eRx ID upon completion. Register for eRx How Do I Apply For An eRx ID? Related articles How does my Patient use the e-Prescription Token?