If your or your child's condition does not improve within 7 days, or if it becomes worse, check with your doctor.
After applying this medicine to the skin of your child, watch the child carefully to make sure that he or she does not get any of the medicine into his or her eyes or mouth. It can cause serious side effects, especially in children, if any of the medicine gets into the mouth or is swallowed.
This medicine may cause a rare, but serious blood problem called methemoglobinemia. This condition may occur after use of the spray for medical procedures or use of the over-the-counter gel or liquid for mouth sores or teething in children. The risk may be increased in children younger than 2 years of age, elderly patients, or patients with certain inborn defects. It is more likely to occur in patients receiving too much of the medicine, but can also occur with small amounts. Make sure you store this medicine out of reach of children. Call your doctor right away if you or your child has the following symptoms after using this medicine: pale, gray, or blue-colored skin, lips, or nails, confusion, headache, lightheadedness, fast heartbeat, or unusual tiredness or weakness.
Call your doctor right away if you start to have a severe sore throat or sore throat that occurs with a high fever, headache, nausea, or vomiting. These maybe signs of an infection.
Make sure your doctor knows if you are also using medicines containing nitrates or nitrites. This includes nitroglycerin, Imdur®, Isordil®, Nitro-Bid®, Nitrostat®, or Transderm-Nitro®.