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Multiple medications are used for comfort and relaxation during and after the procedure. Just as with contrast agents, allergic symptoms can occur, ranging from mild to severe, including anaphylaxis. However, the most commonly used agents rarely have any side effects other than dry mouth and urinary retention.
Occasionally, a patient will have urinary retention requiring temporary catheterization following the procedure. It is usually medication-related and resolves with time. Only occasionally is repeat catheterization or a longer-term catheter necessary.