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• Interactions

There may be other drugs that can interact with phenazopyridine. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using phenazopyridine and call your doctor at once if you have any of these serious side effects:

• pale skin, fever, confusion or weakness;

• jaundice (yellowing of your skin or eyes);

• urinating less than usual or not at all;

• drowsiness, confusion, mood changes, increased thirst, loss of appetite, nausea and vomiting;

• swelling, weight gain, feeling short of breath; or

• blue or purple coloring in your skin.

Less serious side effects may include:

• headache;

• dizziness;

• stomach pain, upset stomach; or

• skin itching.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.