Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat. Stop using this medicine and call your doctor at once if you have: severe burning, stinging, or irritation where the medicine was applied; or breathing problems after using this medicine on the chest. Less serious side effects may be more likely, and you may have none at all. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.