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Methenamine/Phenyl Salicylate/Methylene Blue/Benzoic Acid/Hyoscyamine, Oral meth-EN-a-meen feh-nil sa-LISS-eh-layt meth-eh-leen bloo hy-oh-SIGH-uh-meen

What are other names for this medicine?

Type of medicine: urinary antiseptic

Generic and brand names: methenamine/phenyl salicylate/methylene blue/benzoic acid/hyoscyamine, oral; Prosed DS

What is this medicine used for?

This medicine is take by mouth to treat symptoms of the urinary tract caused by urinary tract infections or certain procedures. It is a combination of medicines that fight bacteria, relieve pain, and decrease spasms.

What should my healthcare provider know before I take this medicine?

Before taking this medicine, tell your healthcare provider if you have ever had:

  • an allergic reaction to any medicine or to formaldehyde
  • gout
  • blockage of the intestines
  • enlarged prostate gland or other problems urinating
  • glaucoma
  • ulcers
  • heart disease or irregular heartbeat
  • kidney disease
  • liver disease
  • myasthenia gravis

Tell your healthcare provider if you take a sulfonamide medicine.

Females of childbearing age: Tell your healthcare provider if you are pregnant or if you plan to become pregnant while taking this medicine. It is not known whether this medicine will harm an unborn baby. Do not breast-feed while taking this medicine without your healthcare provider's approval.

How do I take it?

Check the label on the medicine for directions about your specific dose. Take this medicine in evenly spaced doses for the length of time prescribed, even if you feel better. Take each dose with a full glass of water. Do not miss doses. Drink water or cranberry juice between doses. Follow your healthcare provider's instructions about diet while taking this medicine.

What if I miss a dose?

If you miss a dose, take it as soon as you remember unless it is almost time for the next scheduled dose. In that case, skip the missed dose and take the next one as directed. Do not take double doses. If you are not sure of what to do if you miss a dose, or if you miss more than one dose, contact your healthcare provider.

What if I overdose?

If you or anyone else has intentionally taken too much of this medicine, call 911 or go to the emergency room right away. If you pass out, have seizures, weakness or confusion, or have trouble breathing, call 911. If you think that you or anyone else may have taken too much of this medicine, call the poison control center. Do this even if there are no signs of discomfort or poisoning. The poison control center number is 800-222-1222.

Symptoms of an acute overdose may include: dry mouth, large pupils, hot or dry skin, flushing, drowsiness, blurred vision, fast or irregular heartbeat, coma, painful urination, blood in urine, severe nausea or vomiting, stomach pain, bloody diarrhea, unusual weakness or dizziness, headache, ringing in the ears.

What should I watch out for?

You may need regular urine tests to check whether there is enough acid for the medicine to work. Avoid citrus fruits, fruit juices, milk, and dairy products, which can decrease the amount of acid in the urine. Use antacids only if your healthcare provider approves.

Contact your healthcare provider if your condition does not improve in a few days or if it gets worse.

If you have a rapid pulse, dizziness, or blurred vision, stop taking the medicine and contact your provider right away.

Adults over the age of 65 may be at greater risk for side effects. Talk with your healthcare provider about this.

This medicine may make you dizzy or drowsy. Do not drive or operate machinery unless you are fully alert. Do not drink alcohol or take other medicines unless your healthcare provider approves

This medicine may change your urine or stools to a blue or blue-green color. This is not harmful.

If you need emergency care, surgery, or dental work, tell the healthcare provider or dentist you are taking this medicine.

What are the possible side effects?

Along with its needed effects, your medicine may cause some unwanted side effects. Some side effects may be very serious. Some side effects may go away as your body adjusts to the medicine. Tell your healthcare provider if you have any side effects that continue or get worse.

Life-threatening (Report these to your healthcare provider right away). If you cannot reach your healthcare provider right away, get emergency medical care or call 911 for help): Allergic reaction (hives; itching; rash; trouble breathing; chest pain or tightness in your chest; swelling of your lips, tongue, and throat).

Serious (report these to your healthcare provider right away): Trouble breathing, painful urination or trouble urinating, blurred vision, dizziness, fast or irregular heartbeat.

Other: Nausea, vomiting, dry mouth, constipation, flushing.

What products might interact with this medicine?

When you take this medicine with other medicines, it can change the way this or any of the other medicines work. Nonprescription medicines, vitamins, natural remedies, and certain foods may also interact. Using these products together might cause harmful side effects. Talk to your healthcare provider if you are taking:

  • acetazolamide (Diamox)
  • antacids such as sodium bicarbonate, Maalox, or Mylanta
  • anticholinergic medicines such as atropine, benztropine (Cogentin), dicyclomine (Bentyl), hyoscyamine (Levsin), methscopolamine (Pamine), propantheline, and trihexyphenidyl
  • antidepressants such as bupropion (Wellbutrin, Zyban), desvenlafaxine (Pristiq), duloxetine (Cymbalta), maprotiline (Ludiomil), mirtazapine (Remeron), nefazodone (Serzone), trazodone (Desyrel, Oleptro), and venlafaxine (Effexor)
  • buspirone (BuSpar)
  • citrus fruits and juices, milk, and dairy products
  • aspirin or other salicylates
  • diuretics such as chlorothiazide (Diuril), chlorthalidone (Thalitone), hydrochlorothiazide (Microzide), metolazone (Zaroxolyn) and methyclothiazide
  • ketoconazole (Nizoral)
  • MAO inhibitor antidepressants such as isocarboxazid (Marplan), phenelzine (Nardil), selegiline (Eldepryl, Emsam, Zelapar), and tranylcypromine (Parnate) (Do not take this medicine and an MAO inhibitor within 14 days of each other.)
  • medicine for diarrhea such as loperamide (Imodium) or diphenoxylate/atropine (Lomotil)
  • muscle relaxants such as baclofen (Lioresal), carisoprodol (Soma), cyclobenzaprine (Flexeril), dantrolene (Dantrium), methocarbamol (Robaxin), and tizanidine (Zanaflex)
  • narcotic pain medicines such as codeine, fentanyl (Duragesic, Actiq), hydrocodone/acetaminophen (Vicodin, Lortab), hydromorphone (Dilaudid), meperidine (Demerol), methadone (Dolophine), morphine (Kadian, MS Contin), oxycodone (OxyContin, Roxicodone), oxycodone/acetaminophen (Percocet, Tylox), and pentazocine (Talwin)
  • SSRI antidepressants such as fluoxetine (Prozac, Sarafem), fluvoxamine (Luvox CR), paroxetine (Paxil), and sertraline (Zoloft)
  • tricyclic antidepressants such as amitriptyline, clomipramine (Anafranil), desipramine (Norpramin), doxepin, imipramine (Tofranil), nortriptyline (Pamelor), protriptyline (Vivactil), and trimipramine (Surmontil)
  • sulfonamide antibiotics such as sulfamethoxazole/trimethoprim (Septra, Bactrim) and sulfisoxazole
  • typhoid vaccine

If you are not sure if your medicines might interact, ask your pharmacist or healthcare provider. Keep a list of all your medicines with you. List all the prescription medicines, nonprescription medicines, supplements, natural remedies, and vitamins that you take. Be sure that you tell all healthcare providers who treat you about all the products you are taking.

How should I store this medicine?

Store this medicine at room temperature. Keep the container tightly closed. Protect it from heat, high humidity, and bright light.


This advisory includes selected information only and may not include all side effects of this medicine or interactions with other medicines. Ask your healthcare provider or pharmacist for more information or if you have any questions.

Ask your pharmacist for the best way to dispose of outdated medicine or medicine you have not used. Do not throw medicine in the trash.

Keep all medicines out of the reach of children.

Do not share medicines with other people.


Developed by RelayHealth.
Medication Advisor 2012.1 published by RelayHealth.
Last modified: 2011-08-01
Last reviewed: 2010-06-18
This content is reviewed periodically and is subject to change as new health information becomes available. The information is intended to inform and educate and is not a replacement for medical evaluation, advice, diagnosis or treatment by a healthcare professional.
© 2012 RelayHealth and/or its affiliates. All rights reserved.
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