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warnings
Warnings For topical use only. Methemoglobinemia warning Use of this product may cause methemoglobinemia, a serious condition that must be treated promptly because it reduces the amount of oxygen carried in the blood. Symptoms may occur within minutes to 1–2 hours after use and include: • Pale, gray, or blue‑colored skin, lips, and nail beds • Shortness of breath • Fatigue or lack of energy Stop use and ask a doctor if: • Sore throat is severe and more than 2 days • Fever, headache, rash, nausea, or vomiting occur • Mouth does not heal within 7 days • Irritation, pain, or redness worsens