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You are here : 3-RX.com > Drugs & Medications > Detailed Drug Information (USP DI) > Sulfonamides and Phenazopyridine : Side Effects

Sulfonamides and Phenazopyridine (Systemic)

Sulfonamides and Phenazopyridine | Before Using | Proper Use | Precautions | Side Effects

Side Effects of This Medicine

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

    Check with your doctor immediately if any of the following side effects occur:

      More common

        Itching; skin rash

      Less common

        Aching of joints and muscles; blue or blue-purple discoloration of skin; difficulty in swallowing; pale skin; redness, blistering, peeling, or loosening of skin; shortness of breath; sore throat and fever; unusual bleeding or bruising; unusual tiredness or weakness; yellow eyes or skin


        Blood in urine; greatly increased or decreased frequency of urination or amount of urine; increased thirst; lower back pain; pain or burning while urinating; swelling of front part of neck

    In addition to the side effects listed above, check with your doctor as soon as possible if the following side effect occurs:

      More common

        Increased sensitivity of skin to sunlight

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:

    More common

      Diarrhea; dizziness; headache; loss of appetite; nausea or vomiting; tiredness

    Less common

      Indigestion; stomach cramps or pain

This medicine causes the urine to become reddish orange. This side effect does not require medical attention.

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.

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Sulfonamides and Phenazopyridine: Precautions


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