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What are the Risks?

Pyelography is considered mostly safe. The major risk is a reaction to the iodine-based dye.

Minor reactions include hot flashes, nausea and vomiting. These can often be treated well with antihistamines. There’s also a chance of urinary tract infection or pain.

In very rare cases, more severe reactions can occur. These include:

  • Trouble breathing
  • Low blood pressure
  • Swelling of the mouth or throat
  • Heart attack

Be sure to tell your doctor and the radiologist about your history with allergies.