<p><strong>More common side effects</strong>:&nbsp;Minor redness, burning, irritation, or numbness at the application site; lightheadedness; nausea.<br />
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<strong>Severe side effects</strong>:&nbsp;Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); confusion; dizziness; fainting; fast, slow, or irregular heartbeat; loss of consciousness; mental or mood changes; nervousness; paleness; redness or warmth of skin; ringing in the ears or hearing changes; seizures; sensation of heat or cold; shortness of breath; swelling or blistering of skin; tremors or twitching; vision changes or double vision; vomiting.</p>