Reviewed on 7/27/2023

What Is Flavoxate and How Does It Work?

Flavoxate is a prescription medication used for treating dysuria, increased urinary frequency/incontinence, nocturia, suprapubic pain, urinary incontinence, urinary tract irritation, urinary urgency caused by an overactive bladder.

  • Flavoxate is available under the following different brand names:

What Are Dosages of Flavoxate?

Adult and pediatric dosage


  • 100mg

Overactive Bladder

Adult dosage

  • 100-200 mg orally every 6 to 8 hours

Dysuria, Urinary Frequency

Pediatric dosage

  • Children below 12 years: Not recommended; safety and efficacy not established
  • Children above 12 years: 100-200 mg orally every 6 to 8 hours

Dosage Considerations – Should be Given as Follows: 

  • See “Dosages”

What Are Side Effects Associated with Using Flavoxate?

Common side effects of Flavoxate include:

  • nausea, 
  • vomiting,
  • blurred vision,
  • dry mouth,
  • headache, 
  • dizziness, 
  • drowsiness,
  • pounding heartbeats or fluttering in the chest,
  • confusion, 
  • nervousness, and
  • rash or itching

Serious side effects of Flavoxate include:

  • hyperpyrexia,
  • vertigo, and
  • signs of an allergic reaction: hives, difficult breathing, swelling of the face, lips, tongue, or throat.

Rare side effects of Flavoxate include:

  • none 
This is not a complete list of side effects and other serious side effects or health problems that may occur as a result of the use of this drug. Call your doctor for medical advice about serious side effects or adverse reactions. You may report side effects or health problems to FDA at 1-800-FDA-1088.

What Other Drugs Interact with Flavoxate?

If your medical doctor is using this medicine to treat your pain, your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor, health care provider, or pharmacist first.

  • Flavoxate has severe interactions with no other drugs.
  • Flavoxate has serious interactions with the following drugs:
    • pramlintide
    • secretin
  • Flavoxate has moderate interactions with at least 88 other drugs.
  • Flavoxate has minor interactions with the following drugs:

This information does not contain all possible interactions or adverse effects. Visit the RxList Drug Interaction Checker for any drug interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you and share this information with your doctor and pharmacist. Check with your health care professional or doctor for additional medical advice, or if you have health questions, concerns.

What Are Warnings and Precautions for Flavoxate?


Effects of drug abuse

  • None

Short-Term Effects

  • See “What Are Side Effects Associated with Using Flavoxate?”

Long-Term Effects

  • See “What Are Side Effects Associated with Using Flavoxate?”


  • Use with caution in patients with glaucoma
  • May impair ability to perform hazardous tasks
  • May cause ocular disturbances; advise patients of potential effects
  • Vertigo may occur

Pregnancy and Lactation

  • May be acceptable during pregnancy.


  • Not known if excreted in breast milk, use caution
Medscape. Flavoxate.


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