A facility’s Radioactive Materials License Authorized User(s) can establish an online account and be issued a username and password by contacting NISotopes. Online prescription orders are accepted for next business day delivery only. Same day orders must be called into NISotopes. To ensure that your order is successfully received by the radiopharmacy, all required fields of information must be completed on the online order form. To request changes to an existing order, please call NISotopes at (832) 467-4404.