Complications are exceptionally rare. As a precautionary measure, we ask patients who are considered at an increased risk for infection—those with prior history of pelvic inflammatory disease (PID) or known dilated tubes—to start an antibiotic prior to the procedure to reduce this risk. We also instruct patients not to have intercourse or use tampons for 24 hours. A potentially serious, but very rare, complication can result if you are allergic to the contrast dye. If you have had any allergic reaction to prior contrast dye (as used with a computerized tomography [CT] scan or intravenous pyelogram [IVP]), you need to notify your physician so that he or she can prescribe medications to reduce your risk for a reaction.