What are the side effects of lidocaine and epinephrine?

Lidocaine is expected to produce a numbing and painless effect, but there are some side effects that are unexpected and slightly uncomfortable. Some common side effects that do not require immediate attention include: backaches, coldness, double vision, hearing loss, injection site irritation, nausea, noise in the ears, sensation of heat and vomiting. These are not a cause of immediate concern, but seek medical attention if the problems persist or are severe.
However, some side effects of lidocaine and epinephrine require immediate medical care. Seek medical help if you feel any of the following: blue lips, fingernails or skin; blurry vision; chest  discomfort; cold, clammy, red or pale skin; confusion; cough; delusions about your state of health; difficulty breathing or swallowing; fast heartbeat; headaches; hives or welts; irrational fear or anxiety; irregular breathing or heartbeat; itching; lightheadedness, dizziness or fainting; mental health changes; no blood pressure or pulse; facial swelling; seizures; shakiness in the legs, arms, hands or feet; shortness of breath; skin rash; sleepiness; slow heart rate; trembling or shaking of the hands or feet; twitching; unconsciousness; unusual tiredness or weakness; or wheezing. While most people will not experience these severe effects, they should be taken seriously if they occur.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.