SIDE EFFECTS
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.