What are the side effects of methenamine?

Most of the side effects of methenamine are minor but on rare occasions they can be noteworthy. If you experience any of the following symptoms, let your doctor know. Your pharmacist may have an alternative option.
  • GI disturbances such as nausea, vomiting, diarrhea, abdominal cramps and loss of appetite
  • Rash, itching, hives and mouth sores
  • Headaches, difficulty breathing, swelling, ear ringing and painful urination

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.