Flavoxate (oral)


Flavoxate is part of a group of drugs known as antispasmodics. They are taken via the mouth to help relieve difficult urination and decreasing muscle spasms. This drug is only available via prescription from a doctor and is available in the following dosage form: Tablet.

Condition(s) treated?

  • Needing to Urinate Immediately

Type of medicine?

  • Oral tablet

Side Effects

Along with the intended use of this drug, it can produce some unwanted side effects. Not all of these side effects need to be present at the one time, but if they do present themselves, you may need medical assistance.

Inform your doctor immediately if you suffer from any of the following side effects while taking Flavoxate.


Symptoms of overdose

  • Flushing or redness of face

Some of the side effects that occur with flavoxate usually don't require medical attention. However if you find these side effects are giving you daily bother, you should contact your local pharmacist or healthcare professional for advice on ways to reduce or prevent the severity of these side effects. Inform your doctor or health care professional if any of the following side effects are bothersome or continue:

More common

  • Dryness of mouth and throat

Less common or rare

  • Fast heartbeat

Remember you can report all side effects to the FDA.


The final dosage of any medication will depend on your individual factors. This will include your weight, age and height, any current medications you are taking, any other medical conditions you suffer from, the specific medical condition you are being treated for and your reaction to the first dose.

  • The typical dose for adults and children aged 12 years and above: 100 200 milligrams taken three or four times daily.
  • Children up to 12 years old: The use and dose will be determined by your doctor on an individual basis.

Do not change your dose without consultation with your doctor. Increasing your dose could increase your risk of side effects and decreasing your dose could decrease the effectiveness of the drug in treatment.

Missed Dose

If you miss a dose of this medication, take it as soon as you remember. However, if it is close to the time of your next scheduled dose, then skip the missed dose and revert back to your normal dosing schedule.


Drug interactions can cause severe side effects and reactions. It can also reduce the effectiveness of the drugs you are using. To help avoid and limit the risk of these interactions it's important that you give your doctor or healthcare professional a full and complete list of all the current and past medications you are taking. This should include all prescription and nonprescription drugs, vitamins and herbal products. You should also make your doctor aware of any other medical conditions you suffer from as this could increase the risk of drug interactions. Mention any medical conditions that run in the family history too.

The use of this medication alongside any of the following medications is not usually recommended, but in some cases, it may be required and necessary. If you are prescribed both medications at the same time, your doctor may alter and change the frequency in which you take either medication.

  • Oxymorphone

There are over 700 drugs that interact with flavoxate. Some of them are listed below, but this list is not complete. Let your doctor know if you are taking any of the following drugs.

  • Chlorzoxazone


  • Opium

The presence of other medical conditions may affect the proper use of this medication. Ensure you inform your doctor or healthcare professional of any other medical conditions you may suffer from including:


Let your doctor know if you have ever suffered from an allergic reaction to this medication in the past, or similar medications. You should also inform your healthcare professional or doctor of any other allergies you may suffer from. This should include allergies to animals, preservatives, foods, dyes etc.

Any studies that have been conducted on this medication has been done on adults and children over the age of 12. Therefore the use of this drug is not recommended for those children younger than 12 years old since efficacy and safety has not been established

Confusion can occur in elderly patients, who are usually more sensitive to the effects of flavoxate than younger patients.

This drug is under FDA pregnancy category B and it is not expected to harm an unborn child. However, you should always let your doctor know if you are currently pregnant to intend on becoming pregnant.

It is unknown whether this drug passes into breast milk. You should let your doctor or healthcare professional know if you are currently breastfeeding an infant.

This medication can cause your eyes to become more sensitive to light than normal. You can help reduce discomfort by wearing sunglasses when in bright lights.

This medication can cause some people to experience blurred vision or become drowsy. Ensure you know how you react to this medication before you use machinery, drive, or do any activity that requires you to be able to see well and be alert.

This drug can make you sweat less, which consequently causes your body temperature to increase. Take care to avoid becoming overheated during exercise or when in hot water whilst taking this medication. Overheating can result in a com/health/heat-stroke/">heat stroke. Be aware that saunas or hot baths can make you feel faint or dizzy while you are taking this medication.

Your throat and mouth can feel extremely dry whilst taking this medication. If you require temporary relief of mouth dryness, then try using sugarless gum or candy, melt pieces of ice in your mouth, or try saliva substitute. If your dry mouth continues for over a period of two weeks, then it's best to get a checkup with a dentist or medical doctor. This continued dryness of the mouth could increase the chance of dental disease, including gum disease, tooth decay, and fungus infections.


This medication should be stored in a closed container at room temperature. It needs to be kept away from moisture, heat, and light. Do not let this medication freeze. Always ensure this medication is out of the reach of children and throw away medication that is no longer needed or has expired.


When used correctly and as suggested, flavoxate is successful in the treatment of various unitary problems. This drug cannot be used in children under the age of 12 and if you are pregnant or breastfeeding, you should let your doctor know before you begin taking this medication. This medication should be taken with water on an empty stomach. If you suffer from an upset stomach, take it with milk or food. Only take this medication as you have been told to do so. Do not take it more frequently, or a higher dose as this could increase your risk of side effects. Due to the large number of interactions, it's important you let your doctor know of all current medications that you are taking. If you have any questions or queries then contact your doctor or healthcare professional for advice.