Medications


Methenamine; Sodium Acid Phosphate; Methylene Blue; Hyoscyamine tabs or caps

What is this medicine?

METHENAMINE; SODIUM ACID PHOSPHATE; METHYLENE BLUE; HYOSCYAMINE (meth EN a meen; SOE dee um AS id FOS fate; METH uh leen bloo; hye oh SYE a meen) is used to stop the pain, burning, or discomfort caused by infection or irritation of the urinary tract. This medicine is not an antibiotic. It will not cure a urinary tract infection.

How should I use this medicine?

Take this medicine by mouth with a glass of water. Follow the directions on the prescription label. Take your medicine at regular intervals. Do not take it more often than directed. Do not stop taking except on your doctor's advice.

Talk to your pediatrician regarding the use of this medicine in children. While this drug may be prescribed for children at young as 6 years of age, precautions do apply.

What side effects may I notice from receiving this medicine?

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

  • blurred vision

  • breathing problems

  • dizziness

  • rapid pulse

  • trouble passing urine or change in the amount of urine

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

  • blue or blue-green urine or stools

  • dry mouth

  • flushing

  • nausea, vomiting

  • tiredness

What may interact with this medicine?

  • antacids

  • atropine

  • antihistamines for allergy, cough and cold

  • certain antibiotics like sulfacetamide and sulfamethoxazole

  • certain medicines for bladder problems like oxybutynin, tolterodine

  • certain medicines for blood pressure like hydrochlorothiazide

  • certain medicines for depression, anxiety or psychotic disturbances

  • certain medicines for stomach problems like dicyclomine, hyoscyamine

  • certain medicines for travel sickness like scopolamine

  • certain medicines for Parkinson's disease like benztropine, trihexyphenidyl

  • ipratropium

  • ketoconazole

  • MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate

  • narcotic medicines for pain

What if I miss a dose?

If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

Where should I keep my medicine?

Keep out of the reach of children.

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Throw away any unused medicine after the expiration date.

What should I tell my health care provider before I take this medicine?

They need to know if you have any of these conditions:

  • bladder or prostate problems or trouble passing urine

  • dehydration

  • glaucoma

  • heart disease

  • high blood pressure

  • high levels of phosphate in the blood

  • high levels of sodium in the blood

  • kidney disease

  • liver disease

  • myasthenia gravis

  • sodium (salt) restricted diet

  • stomach problems

  • an unusual or allergic reaction to methenamine, formaldehyde, sodium acid phosphate, methylene blue, hyoscyamine, other medicines, foods, dyes, or preservatives

  • pregnant or trying to get pregnant

  • breast-feeding

What should I watch for while using this medicine?

Tell your doctor or healthcare professional if your symptoms do not start to get better or if they get worse.

You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells.

Your mouth may get dry. Chewing sugarless gum or sucking hard candy, and drinking plenty of water may help. Contact your doctor if the problem does not go away or is severe.

You may need to be on a special diet while taking this medicine. Ask your health care professional how many glasses of water or other fluids to drink each day. Also, ask which foods to include and which to avoid to help keep your urine acidic. Your urine must be acidic for this medicine to work.

This medicine may cause dry eyes and blurred vision. If you wear contact lenses you may feel some discomfort. Lubricating drops may help. See your eye doctor if the problem does not go away or is severe.


NOTE:This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider. Copyright© 2017 Elsevier
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