Sore throat warming: If sore throat is severe, persists for more than 2 days, is accompanied or followed by fever, headache, rash, swelling, nausea, or vomiting, consult a doctor promptly. pale, gray, or blue colored skin (cyanosis) headache rapid heart rate shortness of breath dizziness or lightheadedness fatigue or lack of energy. Do not use for teething in children under 6 years of age. Stop use and ask a doctor or dentist if sore mouth symptoms do not improve in 7 days iritation, pain, or redness persists or worsens swelling, rash, or fever develops. 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 blood. This can occur even if you have used this product before. Stop use and seek immediate medical attention if you or a child in your care develops:. When using this product do not exceed recommended dosage. If pregnant or breast-feeding, ask a health professional before use. Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away. Allergy alert: Do not use this product if you have a history of allergy to local anesthetics such as procaine, butacaine, benzocaine, or other 'caine' anesthetics.