Hyoscyamine produces many effects in the body, including relief from muscle spasms.

Methenamine and methylene blue work as mild antiseptics that fight bacteria in the urine and bladder.

Phenyl salicylate is a mild pain reliever.

Sodium biphosphate is a form of phosphorus, which is a naturally occurring substance that is important in every cell in the body.

Hyoscyamine, methenamine, methylene blue, phenyl salicylate, sodium biphosphate is a combination medicine used to treat bladder irritation (pain, spasms, inflammation) caused by urinary tract infection. This medicine is also used to prevent bladder discomfort during a medical procedure.

Hyoscyamine, methenamine, methylene blue, phenyl salicylate, sodium biphosphate may also be used for purposes not listed in this medication guide.

You should not use this medicine if you are allergic to hyoscyamine, methenamine, methylene blue, phenyl salicylate, or sodium biphosphate.

During your treatment with this medicine, do not start or stop using any other medications unless your doctor tells you to.

To make sure this medicine is safe for you, tell your doctor if you have:

• heart disease;
• a heart rhythm disorder;
• congestive heart failure;
• coronary heart disease;
• a heart valve disorder;
• glaucoma;
• an enlarged prostate or bladder obstruction;
• myasthenia gravis;
• an ulcer or obstruction in your stomach;
• an allergy to belladonna (Donnatal and others); or
• an allergy to salicylates (such as aspirin, choline magnesium trisalicylate, magnesium salicylate).

It is not known whether this medication will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medicine.

This medicine can pass into breast milk and may harm a nursing baby. Tell your doctor if you are breast-feeding a baby.

Do not give this medicine to a child without medical advice.

Use Hyolev MB (Oral) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

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

Stop using this medicine and call your doctor at once if you have:

• severe dizziness, blurred vision, fast heart rate;
• painful or difficult urination; or
• shortness of breath.

Older adults may be more likely to have side effects from this medication.

Methylene blue will most likely cause your urine or stools to appear blue or green in color. This is a normal side effect of the medication and will not cause any harm.

Common side effects may include:

• dizziness, drowsiness;
• dry mouth; or
• nausea, vomiting.

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.

Avoid taking an antacid or anti-diarrhea medicine within 1 hour before or after you take hyoscyamine, methenamine, methylene blue, phenyl salicylate, and sodium biphosphate. Antacids or anti-diarrhea medicine can make it harder for your body to absorb hyoscyamine.

If you also take ketoconazole (Nizoral), wait at least 2 hours after taking it before you take hyoscyamine, methenamine, methylene blue, phenyl salicylate, and sodium biphosphate.