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Flavoxate Side Effects

For the Consumer

Applies to flavoxate: oral tablet

Along with its needed effects, flavoxate 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 as soon as possible if any of the following side effects occur while taking flavoxate:


Symptoms of Overdose

  • Clumsiness or unsteadiness
  • dizziness (severe)
  • drowsiness (severe)
  • fever
  • flushing or redness of face
  • hallucinations (seeing, hearing, or feeling things that are not there)
  • shortness of breath or troubled breathing
  • unusual excitement, nervousness, restlessness, or irritability

Some side effects of flavoxate may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More Common

  • Drowsiness
  • dryness of mouth and throat

Less Common or Rare

For Healthcare Professionals

Applies to flavoxate: oral tablet


Side effects have been reported, however, there is not enough data to support an estimate of their frequency.[Ref]


Frequency not reported: Tachycardia, palpitation[Ref]


Frequency not reported: Nausea, vomiting, dry mouth, diarrhea, dyspepsia, dysphagia[Ref]


Frequency not reported: Ocular tension increased, blurred vision, eye accommodation disturbed[Ref]

Nervous system

Frequency not reported: Headache, drowsiness, dizziness[Ref]


Frequency not reported: Leukopenia, eosinophilia[Ref]


Frequency not reported: Hypersensitivity reaction[Ref]


Frequency not reported: Confusion, nervousness[Ref]


Frequency not reported: Dysuria[Ref]


Frequency not reported: Vertigo, hyperpyrexia, fatigue[Ref]


Frequency not reported: Urticaria, dermatoses, angioedema, erythema, rash, pruritus[Ref]


1. MHRA. Medicines and Health Regulatory Agency "MHRA Drug Safety Update. Available from: URL:"

2. "Product Information. FlavoxATE Hydrochloride (flavoxATE (flavoxate))." PuraCap Pharmaceutical, South Plainfield, NJ.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.