Atropine, Hyoscyamine, Methenamine, Methylene Blue, Phenyl Salicylate, and Benzoic Acid (Oral Route)

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Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

• Blurred vision
• Eye pain
• Skin rash or hives

• Blood in urine and/or stools
• Diarrhea
• Dizziness
• Drowsiness (severe)
• Fast heartbeat
• Flushing or redness of face
• Headache (severe or continuing)
• Lower back pain
• Pain or burning while urinating
• Ringing or buzzing in the ears
• Shortness of breath or troubled breathing
• Sweating
• Unusual tiredness or weakness

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

• Difficult urination (more common with large doses taken over a prolonged period of time)
• Dryness of mouth, nose, or throat
• Nausea or vomiting
• Stomach upset or pain (more common with large doses taken over a prolonged period of time)

This medicine may cause your urine and/or stools to turn blue or blue-green. This is to be expected while you are taking this medicine.

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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