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Urex Patient Information including If I Miss a Dose
In this Article
- What is methenamine (Urex)?
- What are the possible side effects of methenamine (Urex)?
- What is the most important information I should know about methenamine (Urex)?
- What should I discuss with my healthcare provider before taking methenamine (Urex)?
- How should I take methenamine (Urex)?
- What happens if I miss a dose (Urex)?
- What happens if I overdose (Urex)?
- What should I avoid while taking methenamine (Urex)?
- What other drugs will affect methenamine (Urex)?
- Where can I get more information?
What happens if I miss a dose (Urex)?
Take the missed dose as soon as you remember. However, if it is almost time for the next dose, skip the dose you missed and take only the next regularly scheduled dose. Do not take a double dose of this medication unless otherwise directed by your doctor.
What happens if I overdose (Urex)?
Seek emergency medical attention if an overdose is suspected.
Symptoms of a methenamine overdose are not known.
What should I avoid while taking methenamine (Urex)?
Your healthcare provider may recommend drinking additional water and/or certain fruit juices (e.g., cranberry, plum, prune) and increased protein in the diet while taking methenamine to ensure adequate hydration and acidity of the urine. It may also be recommended to avoid citrus fruits and juices (e.g., orange, grapefruit, lemon), milk and dairy products, and antacids during treatment with methenamine. These products may decrease the effectiveness of methenamine. Follow your healthcare provider's instructions.
What other drugs will affect methenamine (Urex)?
Do not take methenamine without first talking to your doctor if you are taking:
- a carbonic anhydrase inhibitor such as acetazolamide (Diamox), dichlorphenamide (Daranide), or methazolamide (Glauctabs, MZM, Neptazane);
- a sulfa product such as sulfadiazine, sulfamethoxazole (Bactrim, Septra, others), sulfasalazine (Azulfidine), and others;
- a diuretic (water pill); or
- a product that contains aluminum, calcium, magnesium, sodium bicarbonate, potassium or sodium citrate, or citric acid (such as antacids, vitamin or mineral pills, urinary alkalinizers, and other medications).
You may not be able to take methenamine, or you may require a dosage adjustment or special monitoring during treatment if you are taking any of the medicines listed above.
Drugs other than those listed here may also interact with methenamine. Talk to your doctor and pharmacist before taking any prescription or over-the-counter medicines, including vitamins, minerals, and herbal products.
Where can I get more information?
Your pharmacist has additional information about methenamine written for health professionals that you may read.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
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Additional Urex Information
Urex - User Reviews
Urex User Reviews
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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