Flavoxate Side Effects

Some side effects of flavoxate may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

For the Consumer

Applies to flavoxate: oral tablet

Get emergency medical help if you have any of these signs of an allergic reaction while taking flavoxate: 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 of flavoxate 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.

For Healthcare Professionals

Applies to flavoxate: oral tablet

General

Flavoxate is generally well tolerated and an estimated frequency of particular side effects is not available.

Cardiovascular

Cardiovascular side effects have included tachycardia and palpitation.

Gastrointestinal

Gastrointestinal side effects have included nausea, vomiting, and dry mouth.

Ocular

Ocular side effects have included increased ocular tension, blurred vision, and altered accommodation.

Nervous system

Nervous system side effects have included vertigo, headache, mental confusion, drowsiness, and nervousness. These effects may be exaggerated in elderly patients.

Renal

Renal side effects have included dysuria, and obstructive uropathies of the lower urinary tract.

Hypersensitivity

Hypersensitivity side effects have included urticaria and other unspecified dermatoses, eosinophilia, and elevated temperature.

Hematologic

Hematologic side effects have been reported rarely. A case of reversible leukopenia has been reported.

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