Flavoxate Side Effects

Medically reviewed by Drugs.com. Last updated on Jul 20, 2023.

Applies to flavoxate: oral tablet.

Serious side effects of Flavoxate

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:

Rare

• Confusion
• eye pain
• skin rash or hives
• sore throat and fever

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

Other side effects of Flavoxate

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

• Blurred vision
• constipation
• difficult urination
• difficulty concentrating
• dizziness
• fast heartbeat
• headache
• increased sensitivity of eyes to light
• increased sweating
• nausea or vomiting
• nervousness
• stomach pain

For Healthcare Professionals

Applies to flavoxate: oral tablet.

General

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

Cardiovascular

Frequency not reported: Tachycardia, palpitation^[Ref]

Gastrointestinal

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

Ocular

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

Nervous system

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

Hematologic

Frequency not reported: Leukopenia, eosinophilia^[Ref]

Immunologic

Frequency not reported: Hypersensitivity reaction^[Ref]

Psychiatric

Frequency not reported: Confusion, nervousness^[Ref]

Genitourinary

Frequency not reported: Dysuria^[Ref]

Other

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

Dermatologic

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

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.

Medical Disclaimer