Before Using

Drug information provided by: Merative, Micromedex®

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:

Allergies

Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.

Pediatric

Studies on this medicine have been done only in adult patients and in children over 12 years of age. Flavoxate is not recommended for children younger than 12 years of age because safety and efficacy have not been established.

Geriatric

Confusion may be especially likely to occur in elderly patients, who are usually more sensitive than younger adults to the effects of flavoxate.

Breastfeeding

There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.

Drug Interactions

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.

  • Potassium Citrate

Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

  • Amantadine
  • Amifampridine
  • Buprenorphine
  • Bupropion
  • Clozapine
  • Codeine
  • Donepezil
  • Glucagon
  • Glycopyrrolate
  • Glycopyrronium Tosylate
  • LetibotulinumtoxinA-wlbg
  • Methacholine
  • Oliceridine
  • Oxycodone
  • Quetiapine
  • Revefenacin
  • Scopolamine
  • Secretin Human
  • Sufentanil
  • Tapentadol
  • Tiotropium
  • Tramadol

Other Interactions

Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.

Other Medical Problems

The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:

  • Bleeding (severe) or
  • Glaucoma or
  • Intestinal blockage or other intestinal or stomach problems or
  • Urinary tract blockage—Use of flavoxate may make these conditions worse
  • Enlarged prostate—Use of flavoxate may cause difficult urination

Portions of this document last updated: April 01, 2024

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