Methenamine hippurate may be effective in preventing UTI in patients without renal tract abnormalities particularly when used for short term prophylaxis. It does not appear to be effective for long term prophylaxis in patients who have neuropathic bladder. There were few adverse effects.

What is methenamine used to treat?

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.

Is methenamine safe for kidneys?

The safety of methenamine in patients with renal dysfunction or severe dehydration is questionable. Manufacturer package inserts for both methenamine products (Hiprex and Urex) identify renal insufficiency, hepatic insufficiency and severe dehydration as contraindications to methenamine use.

When is the best time to take methenamine?

Take after meals and at bedtime. Children up to 6 years of age—Dose is based on body weight. The usual dose is 18.3 mg per kilogram (kg) (8.3 mg per pound) of body weight four times a day. Take after meals and at bedtime.

Is methenamine carcinogenic?

No carcinogenicity studies that meet current standards were performed with methenamine. From a number of limited life-time studies on rats and mice, all using the oral route of exposure, there was no indication of a carcinogenic potential.

Can methenamine irritate bladder?

Taking higher than recommended doses of methenamine may cause bladder irritation, painful/frequent urination, and bloody/pink urine.

How many days should I take methenamine?

Methenamine comes as a tablet and a liquid to take by mouth. It usually is taken either two times a day (every 12 hours) or four times a day (after meals and at bedtime). Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand.

Is methenamine expensive?

Methenamine is used to prevent or control returning urinary tract infections caused by certain bacteria. Learn more about this drug here. This is a generic drug. The average cost for 60 Tablet(s), 1gm each of the generic (methenamine hippurate) is $95.49.

Can methenamine cause itching?

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects.

Why do you take Vitamin C with methenamine?

It’s what is called a “urinary tract antiseptic.” Methenamine relies on a pH < 5.5 to be effective so urinary pH acidifying agents are prescribed along with it—namely, 1 – 4 grams per day of Vitamin C (ascorbic acid).

Article first time published on

Should methenamine be taken with Vitamin C?

Interactions between your drugs No interactions were found between methenamine and Vitamin C.

Does methenamine cause weight gain?

Teratogenic effects. Pregnancy category C. Oral administration of methenamine to pregnant dogs, at doses equivalent to the human dose, has been reported to cause a slight increase in the stillborn rate and slight impairment of weight gain and survival of live-born offspring.

Should you take methenamine with food?

If this medicine causes nausea or upset stomach, it may be taken after meals and at bedtime. For patients taking the dry granule form of this medicine : Dissolve the contents of each packet in 2 to 4 ounces of cold water immediately before taking.

Can you drink with methenamine?

Alcohol may increase drowsiness and dizziness while you are taking hyoscyamine. You should be warned not to exceed recommended dosages and to avoid activities requiring mental alertness. If your doctor prescribes these medications together, you may need a dose adjustment to safely take this combination.

Does methenamine affect urine test?

You may need frequent urine tests to determine that an infection has cleared. You may also need blood tests to check your liver function. Methenamine can affect the results of certain medical tests, especially if you are pregnant while taking this medicine. Tell any doctor who treats you that you are using methenamine.

Is methenamine safe for dogs?

Methenamine is a medicine that can be used for preventing recurrent urinary tract infections in dogs and cats. The FDA (U.S. Food & Drug Administration) has approved this drug for use in humans but it is not officially approved for use in animals.

Can hiprex cause gout?

Methenamine (applies to Hiprex) gout Major Potential Hazard, Moderate plausibility. Methenamine mandelate (salts), should be avoided in patients with gout as it may precipitate urate crystals in their urine. A similar situation may arise in patients with a predisposition to the formation of uric acid stones.

What should I eat while taking hiprex?

One thing to keep in mind while taking methenamine (Hiprex, Mandelamine, Urex) is that the drug works best when your urine pH is acidic. So the goal is to increase foods that make urine more acidic. Try eating more cranberries, nuts (and nut butters), grains, beans and legumes to acidify urine.

Can you take azo long term?

Do not use AZO Urinary Pain Relief for longer than 2 days unless your doctor has told you to. This medication can cause unusual results with urine tests.

How can I make my urine more acidic?

To help make your urine more acid you should avoid most fruits (especially citrus fruits and juices), milk and other dairy products, and other foods which make the urine more alkaline. Eating more protein and foods such as cranberries (especially cranberry juice with vitamin C added), plums, or prunes may also help.

Does methenamine cause kidney stones?

Specifically taking sulfa antibiotics, cephalosporins, fluoroquinolones, nitrofurantoin/methenamine, and broad-spectrum penicillins were linked to a 1.3 to 2.3 times greater risk for kidney stones, the investigators noted.

Can methenamine hippurate cause itching?

Side effects that you should report to your doctor or health care professional as soon as possible: allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue. bladder pain, irritation.

Does methenamine cause ringing in the ears?

Tell your doctor immediately if any of these unlikely but serious side effects occur: mouth sores, unusual headache, ringing in the ears, muscle cramps, swelling of the arms/legs. A very serious allergic reaction to this drug is rare.

Is methenamine over the counter?

Only one OTC product on the market contains the antibacterial agent methenamine and the analgesic sodium salicylate (Table). The recommended directions for use of the product are 2 tablets with a full glass of water 4 times a day. This product is not to be used as a replacement for antibiotic therapy.

What is the brand name for methenamine?

BRAND NAME(S): Hiprex, Mandelamine, Urex. USES: Methenamine is used to prevent or control returning urinary tract infections caused by certain bacteria. It is not used to treat an active infection.

How much is Hiprex cost?

The lowest GoodRx price for the most common version of generic Hiprex is around $33.43, 72% off the average retail price of $121.28. Compare urinary antibiotics.

Does Hiprex prevent UTI?

Hiprex may be used to treat and prevent urinary tract infections. It is important to take Hiprex regularly to prevent urinary tract infections. Do not wait for symptoms. Hiprex is a urinary antiseptic that fights bacteria in the urine and bladder.

Does methenamine change pH of urine?

Methenamine (Hiprex, Urex) is a urinary tract antiseptic. It is hydrolyzed to formaldehyde and ammonia in acidic urine, which produces antibacterial effects. The urine pH needs to be acidic (pH below 5.5 is a common goal) for it to convert to formaldehyde.

Can methenamine hippurate be cut in half?

The tablets can be broken in half. If you find it particularly difficult to swallow them, the tablets may be crushed and taken with a drink of milk or fruit juice. If you accidentally take more Hiprex than you should you might be sick or see blood in your urine.

What product should be avoided while taking hiprex?

Some products that may interact with this drug include: sulfonamide drugs (including sulfa antibiotics such as sulfamethizole), products that decrease the amount of acid in the urine (urinary alkalinizers such as antacids, sodium bicarbonate, potassium or sodium citrate, carbonic anhydrase inhibitors such as …

Does hiprex affect your kidneys?

very serious loss of body water. liver problems. severe liver disease. decreased kidney function.