Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using benzocaine topical and call your doctor at once if you have any of these serious side effects:
severe burning, stinging, or sensitivity where the medicine is applied; ;
swelling, warmth, or redness; ;
oozing, blistering, or any signs of infection; or ;
headache, weakness, dizziness, breathing problems, fast heart rate, and gray or bluish colored skin (rare but serious side effects of benzocaine). .
Less serious side effects may include:
mild stinging, burning, or itching where the medicine is applied; ;
skin tenderness or redness; or ;
dry white flakes where the medicine was applied. .
This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.
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