Final answer:
After completing the antibiotic course.
Step-by-step explanation:
When a patient has a diagnosis of Pelvic Inflammatory Disease (PID) and is using an Intrauterine Device (IUD), the IUD should be removed after completing the antibiotic course. This is because the presence of PID increases the risk of complications with the IUD, such as infection or perforation.
By removing the IUD after completing the antibiotic course, the healthcare provider ensures that the infection has been adequately treated and reduces the chances of further complications.