Skip to main navigation Skip to main content Skip to footer For Medicare For Providers For Brokers For Employers Español For Individuals & Families: For Individuals & Families Medical Dental Other Supplemental Explore coverage through work How to Buy Health Insurance Types of Dental Insurance Open Enrollment vs. Special Enrollment See all topics Shop for Medicare plans Member Guide Find a Doctor Log in to myCigna
Home Knowledge Center Wellness Library methenamine

methenamine

Pronunciation: meh THEH na meen

Brand: Hiprex

Methenamine Mandelate

slide 1 of 8, Methenamine Mandelate,

mandelate 0.5 g, oval, blue, imprinted with 105

Image of Methenamine Mandelate
slide 1 of 8

Methenamine Mandelate

slide 2 of 8, Methenamine Mandelate,

mandelate 1 g, oval, pink, imprinted with 106

Image of Methenamine Mandelate
slide 2 of 8

Methenamine Hippurate

slide 3 of 8, Methenamine Hippurate,

hippurate 1 g, oval, peach, imprinted with cor 139

Image of Methenamine Hippurate
slide 3 of 8

Hiprex

slide 4 of 8, Hiprex,

hippurate 1 g, oval, yellow, imprinted with MERRELL 277

Image of Hiprex
slide 4 of 8

Mandelamine

slide 5 of 8, Mandelamine,

mandelate 0.5 g, oblong, brown, imprinted with 166

Image of Mandelamine
slide 5 of 8

Mandelamine

slide 6 of 8, Mandelamine,

mandelate 1 g, oblong, purple, imprinted with 167

Image of Mandelamine
slide 6 of 8

Methenamine Hippurate

slide 7 of 8, Methenamine Hippurate,

hippurate 1 g, oval, peach, imprinted with cor 139

Image of Methenamine Hippurate
slide 7 of 8

Urex

slide 8 of 8, Urex,

hippurate 1 g, oblong, white, imprinted with UR EX, VP

Image of Urex
slide 8 of 8
What is the most important information I should know about methenamine?

What is the most important information I should know about methenamine?

Use only as directed. Tell your doctor if you use other medicines or have other medical conditions or allergies.

What is methenamine?

What is methenamine?

Methenamine is an antibacterial medicine used to treat or prevent bladder infections in adults and children at least 6 years old.

Methenamine may also be used for purposes not listed in this medication guide.

What should I discuss with my healthcare provider before taking methenamine?

What should I discuss with my healthcare provider before taking methenamine?

You should not use methenamine if you are allergic to it, or if you have:

  • kidney disease;
  • severe liver disease; or
  • if you are dehydrated.

Ask a doctor or pharmacist if this medicine is safe to use if you've ever had liver problems.

Ask a doctor before using this medicine if you are pregnant.

Do not breastfeed.

How should I take methenamine?

How should I take methenamine?

Use exactly as directed on the label, or as prescribed by your doctor.

Methenamine works best when your urine has a low pH and is acidic. You can measure your pH levels at home using urine test strips purchased from a pharmacy. Your doctor may occasionally test your urine to make sure an infection has cleared.

Learn about the foods to eat or avoid to help keep your urine acidic. Your doctor may also prescribe other medicines. Drink plenty of liquids.

Follow your doctor's diet and medication instructions very closely.

Keep using this medicine even if your symptoms quickly improve. Skipping doses could make your infection resistant to medication. Methenamine will not treat a viral infection (flu or a common cold).

This medicine can affect the results of certain medical tests. Tell any doctor who treats you that you are using methenamine.

Do not use methenamine to treat any condition that has not been checked by your doctor.

Do not share this medicine with another person, even if they have the same symptoms you have.

Store at room temperature away from moisture, heat, and light. Keep the bottle tightly closed when not in use.

What happens if I miss a dose?

What happens if I miss a dose?

Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.

What happens if I overdose?

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

What should I avoid while taking methenamine?

What should I avoid while taking methenamine?

Avoid taking extra methenamine, or you could have side effects such as bladder irritation, pain, increased urination, and blood in the urine.

What are the possible side effects of methenamine?

What are the possible side effects of methenamine?

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • increased urination;
  • painful urination;
  • blood in your urine; or
  • swelling, shortness of breath.

Common side effects may include:

  • painful urination;
  • nausea, vomiting; or
  • rash, itching.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What other drugs will affect methenamine?

What other drugs will affect methenamine?

Other drugs may affect methenamine, especially a sulfa drug. Tell your doctor about all other medicines you use. This includes prescription and over-the-counter medicines, vitamins, and herbal products.

Where can I get more information?

Where can I get more information?

Your pharmacist can provide more information about methenamine.

This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.

Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.

<cipublic-spinner variant="large"><span>Loading…</span></cipublic-spinner>

Page Footer

I want to...

Get an ID card File a claim View my claims and EOBs Check coverage under my plan See prescription drug list Find an in-network doctor, dentist, or facility Find a form Find 1095-B tax form information View the Cigna Glossary Contact Cigna

Audiences

Individuals and Families Medicare Employers Brokers Providers

Secure Member Sites

myCigna member portal Health Care Provider portal Cigna for Employers Client Resource Portal Cigna for Brokers

Cigna Company Information

About Cigna Company Profile Careers Newsroom Investors Suppliers Third Party Administrators International Evernorth

 Cigna. All rights reserved.

Privacy Legal Product Disclosures Cigna Company Names Customer Rights Accessibility Non-Discrimination Notice [PDF] Language Assistance [PDF] Report Fraud Sitemap

Disclaimer

Individual and family medical and dental insurance plans are insured by Cigna Health and Life Insurance Company (CHLIC), Cigna HealthCare of Arizona, Inc., Cigna HealthCare of Illinois, Inc., and Cigna HealthCare of North Carolina, Inc. Group health insurance and health benefit plans are insured or administered by CHLIC, Connecticut General Life Insurance Company (CGLIC), or their affiliates (see a listing of the legal entities  that insure or administer group HMO, dental HMO, and other products or services in your state). Accidental Injury, Critical Illness, and Hospital Care plans or insurance policies are distributed exclusively by or through operating subsidiaries of Cigna Corporation, are administered by Cigna Health and Life Insurance Company, and are insured by either (i) Cigna Health and Life Insurance Company (Bloomfield, CT); (ii) Life Insurance Company of North America (“LINA”) (Philadelphia, PA); or (iii) New York Life Group Insurance Company of NY (“NYLGICNY”) (New York, NY), formerly known as Cigna Life Insurance Company of New York. The Cigna name, logo, and other Cigna marks are owned by Cigna Intellectual Property, Inc. LINA and NYLGICNY are not affiliates of Cigna.

All insurance policies and group benefit plans contain exclusions and limitations. For availability, costs and complete details of coverage, contact a licensed agent or Cigna sales representative. This website is not intended for residents of New Mexico.

Selecting these links will take you away from Cigna.com to another website, which may be a non-Cigna website. Cigna may not control the content or links of non-Cigna websites. Details