Lignocaine (also called lidocaine) is a local anesthetic medicine. It temporarily numbs an area by blocking pain signals from nerves. However, lidocaine comes in several forms—such as gels, creams, patches, oral/viscous solutions, and injections—and they are not interchangeable.
The safest way to use a lidocaine product is to follow the exact label or prescription for that specific formulation. Do not assume that a product meant for skin can also be used in the mouth, throat, genital area, or on broken skin.
What Is Lidocaine Gel Used For?
Depending on the product and country, lidocaine gel may be prescribed or used by healthcare professionals to numb tissue before certain medical or dental procedures. Some lidocaine products are designed for intact skin, while others are specifically made for mucous membranes or oral use.
Because the approved uses differ by formulation, check the package label or ask a pharmacist or clinician before using it for a new purpose.
Important: Different Lidocaine Products Have Different Instructions
- Skin products: Some topical lidocaine products are intended for temporary relief of minor pain on intact skin. They should not automatically be used on open wounds, irritated skin, the eyes, or inside the body.
- Oral/viscous lidocaine: This is a separate formulation used for certain mouth or throat conditions. It must be used exactly as prescribed because swallowing too much can cause serious toxicity.
- Medical-procedure gels or injections: These are often administered or directed by healthcare professionals and should not be self-used outside their intended setting.
How to Use Lidocaine More Safely
- Use only the amount and frequency stated on the label or prescription.
- Do not use more often, over a larger area, or for longer than directed.
- Do not apply to broken or severely irritated skin unless the specific product instructions allow it.
- Avoid contact with the eyes.
- Do not cover the treated area tightly or apply direct heat unless your healthcare provider says it is safe.
- Keep lidocaine products out of reach of children and pets.
- If the area becomes numb, protect it from burns, cuts, scratching, or extreme heat and cold until normal sensation returns.
Can Lidocaine Cause Side Effects?
Yes. Mild local effects can include temporary burning, redness, swelling, or irritation at the application site. Serious reactions are uncommon but can occur, especially when too much lidocaine is absorbed.
Seek urgent medical help for:
- Trouble breathing or swallowing, facial or throat swelling, hives, or fainting
- Seizures, severe confusion, unusual drowsiness, or loss of consciousness
- Irregular or very slow heartbeat
- Pale, gray, or blue-colored skin, shortness of breath, severe dizziness, headache, or unusual fatigue—possible signs of methemoglobinemia
Who Should Be Extra Careful?
Talk with a clinician or pharmacist before using lidocaine if you have significant liver, heart, lung, or blood disorders, a history of methemoglobinemia, G6PD deficiency, or if you take several medicines that could interact with local anesthetics.
If you are pregnant or breastfeeding, ask a healthcare professional about the specific product before using it. Safety depends on the formulation, dose, body area, and how much medicine may be absorbed.
Children Need Special Caution
Young children are more vulnerable to serious lidocaine toxicity. Oral or viscous lidocaine in particular can be dangerous if too much is given or swallowed. Never estimate a child’s dose yourself. Use only a product and dose specifically recommended by a qualified healthcare professional.
Can Lidocaine Be Used on Genital or Sensitive Areas?
Only if the specific product is intended for that area or a healthcare professional has advised it. Genital and other mucosal tissues can absorb medicines differently from normal skin. Using the wrong formulation or too much product may increase the risk of numbness, irritation, accidental injury, or systemic side effects.
Can Lidocaine Be Used for a Sore Throat?
Do not use ordinary skin gel in the throat. Some viscous oral lidocaine products are prescribed for mouth or throat pain, but they have separate dosing and safety instructions. They can also reduce sensation and make swallowing less safe, so follow professional advice carefully.
What About Drug Interactions?
Lidocaine can interact with some medicines, and the relevance depends on how much lidocaine is absorbed and which formulation you use. Instead of relying on a generic interaction list, tell your doctor or pharmacist about all prescription medicines, over-the-counter medicines, supplements, and herbal products you use.
When to Stop and Get Medical Advice
Stop using the product and contact a healthcare professional if you develop persistent irritation, worsening pain, unusual numbness, or symptoms that do not improve as expected. Get urgent help for severe allergic symptoms, seizures, breathing problems, abnormal heart symptoms, or blue/gray skin.
Bottom Line
Lidocaine can be useful and safe when the right formulation is used for the right purpose and at the correct dose. The biggest mistake is treating all lidocaine products as interchangeable. Always follow the exact product label or prescription, and ask a pharmacist or clinician if you are unsure where or how to use it.
Reliable Sources
- MedlinePlus: Lidocaine Viscous Oral Rinse
- MedlinePlus: Lidocaine and Prilocaine Topical
- FDA: Lidocaine Prescribing Information
This article is for general educational information and does not replace instructions from your own doctor, dentist, or pharmacist.