You should not use this medication if you are allergic to Urispas, or if you have untreated or uncontrolled narrow-angle glaucoma, a blockage in your digestive tract (stomach or intestines), or if you are unable to urinate.

Before using Urispas, tell your doctor if you have glaucoma or urinary problems.
Urispas can cause drowsiness or blurred vision. Be careful if you drive or do anything that requires you to be alert and able to see clearly. There may be other medicines that can interact with flavoxate. 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. Keep a list with you of all the medicines you use and show this list to any doctor or other healthcare provider who treats you.

Stop using this medication and call your doctor if you have serious side effects such as hot and dry skin, confusion, pounding heartbeats, fluttering in your chest, or if you stop urinating.

Be sure your doctor knows if you have:

a blockage in your stomach or intestines;

a history of stomach ulcer or bleeding; or

if you are unable to urinate.

Before using it, tell your doctor if you are allergic to any drugs, or if you have:

glaucoma; or

urinary problems.

If you have any of these conditions, you may need a dose adjustment or special tests to safely take Urispas.
FDA pregnancy category B. This medication is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. It is not known whether flavoxate passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

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


hot, dry skin and extreme thirst;

confusion;

pounding heartbeats, fluttering in your chest; or

urinating less than usual or not at all.

Less serious side effects may include:

dry mouth;

blurred vision;

nausea, vomiting;

drowsiness, nervousness;

spinning sensation;

headache; or

fever.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.