Urex (Oral)

Generic name:methenamine (oral route) [ meth-EN-a-meen ]
Drug class:Urinary anti-infectives

Medically reviewed by Drugs.com. Last updated on Jun 4, 2022.

Commonly used brand name(s)

In the U.S.

• Hiprex
• Mandelamine
• Urex

In Canada

• Urasal

Available Dosage Forms:

• Tablet

Therapeutic Class: Antiseptic

Uses for Urex

Methenamine belongs to the family of medicines called anti-infectives. It is used to help prevent and treat infections of the urinary tract. Methenamine is available only with your doctor's prescription.

Before using Urex

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

Although there is no special information comparing use of methenamine in children with use in other age groups, this medicine is not expected to cause different side effects or problems in children than it does in adults.

Geriatric

Many medicines have not been studied specifically in older people. Therefore, it may not be known whether they work exactly the same way they do in younger adults or if they cause different side effects or problems in older people. There is no specific information comparing use of methenamine in the elderly with use in other age groups.

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.

Interactions with medicines

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.

• Acetazolamide
• Mafenide
• Silver Sulfadiazine
• Sulfabenzamide
• Sulfacetamide
• Sulfacytine
• Sulfadiazine
• Sulfameraz...