Pronunciation: meth-EN-a-meen
Generic Name: Methenamine
Brand Name: Examples include Hiprex and Urex
Urex is used for:
Preventing urinary tract infections.
Urex is a urinary antiseptic. It works by concentrating in the urine as formaldehyde, which kills bacteria in the urine.
Do NOT use Urex if:
- you are allergic to any ingredient in Urex
- you have kidney problems
- you are taking a sulfonamide (eg, sulfamethizole)
Contact your doctor or health care provider right away if any of these apply to you.
Before using Urex:
Some medical conditions may interact with Urex. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
- if you are pregnant, planning to become pregnant, or are breast-feeding
- if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
- if you have allergies to medicines, foods, or other substances
- if you have diarrhea, a stomach infection, liver or kidney problems, or gout, or you are severely dehydrated
Some MEDICINES MAY INTERACT with Urex. Tell your health care provider if you are taking any other medicines, especially any of the following:
- Sulfonamides (eg, sulfamethizole) because they may decrease Urex's effectiveness
This may not be a complete list of all interactions that may occur. Ask your health care provider if Urex may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.
How to use Urex:
Use Urex as directed by your doctor. Check the label on the medicine for exact dosing instructions.
- Take Urex by mouth with or without food. If stomach upset occurs, take with food to reduce stomach irritation.
- Before you begin using an antacid, check with your doctor or pharmacist.
- If you miss a dose of Urex, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.
Ask your health care provider any questions you may have about how to use Urex.
Important safety information:
- It is important that your urine be acidic while you are taking Urex. Check with your doctor to see if you should eat or avoid certain foods to keep your urine acidic.
- Urex may interfere with certain lab tests. Be sure your doctor and lab personnel know you are taking Urex.
- Lab tests, including urine pH, may be performed while you use Urex. These tests may be used to monitor your condition or check for side effects. Be sure to keep all doctor and lab appointments.
- PREGNANCY and BREAST-FEEDING: It is not known if Urex can cause harm to the fetus. If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using Urex while you are pregnant. Urex is found in breast milk. If you are or will be breast-feeding while you use Urex, check with your doctor. Discuss any possible risks to your baby.
Possible side effects of Urex:
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Nausea; upset stomach.
Seek medical attention right away if any of these SEVERE side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); blood in the urine.
This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.
See also: Urex side effects (in more detail)
If OVERDOSE is suspected:
Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center, or emergency room immediately.
Proper storage of Urex:
Store Urex at room temperature, between 59 and 86 degrees F (15 and 30 degrees C). Store away from heat, moisture, and light. Do not store in the bathroom. Keep Urex out of the reach of children and away from pets.
General information:
- If you have any questions about Urex, please talk with your doctor, pharmacist, or other health care provider.
- Urex is to be used only by the patient for whom it is prescribed. Do not share it with other people.
- If your symptoms do not improve or if they become worse, check with your doctor.
- Check with your pharmacist about how to dispose of unused medicine.
This information is a summary only. It does not contain all information about Urex. If you have questions about the medicine you are taking or would like more information, check with your doctor, pharmacist, or other health care provider.
More Urex resources
- Urex Side Effects (in more detail)
- Urex Use in Pregnancy & Breastfeeding
- Drug Images
- Urex Drug Interactions
- Urex Support Group
- 0 Reviews for Urex - Add your own review/rating
- Urex Advanced Consumer (Micromedex) - Includes Dosage Information
- Urex Concise Consumer Information (Cerner Multum)
- Methenamine Monograph (AHFS DI)
- Methenamine Prescribing Information (FDA)
- Hiprex Prescribing Information (FDA)
Compare Urex with other medications
- Bladder Infection
- Prevention of Bladder infection
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