Lidocaine is one of the most widely used local anesthetics in medicine and dentistry. Whether you’re getting a cavity filled, undergoing minor surgery, or using a topical cream, lidocaine helps by numbing the targeted area.
But how long does lidocaine last?
This article answers that question in detail. We’ll cover its effects on different parts of the body, what influences its duration, and how to manage numbness effectively.
What’s In Lidocaine?
Lidocaine is an amide-type local anesthetic. It works by blocking sodium channels in nerve cells, stopping pain signals from reaching the brain. Here’s a quick breakdown of its components:
- Active Ingredient: Lidocaine hydrochloride
- Form: Injection, cream, spray, or gel
- Strength: Usually ranges from 1% to 5%
- Additives: May include epinephrine to extend its effect
Lidocaine is safe when used correctly, but how long lidocaine lasts depends on where and how it’s applied.
Understanding Local Anesthesia
Local anesthesia is a technique used to numb a specific area. It helps during minor procedures without putting the patient to sleep.
Lidocaine is often chosen because:
- It acts fast (usually within 2–5 minutes)
- It’s effective for both minor and moderate procedures
- It comes in various forms (topical, injectable, spray)
But how long does lidocaine last? Let’s explore its different applications.
How Long Does Lidocaine Last Dentist?
When visiting a dentist, lidocaine injections are commonly used to numb the gums or mouth.
- Typical duration: 1 to 2 hours
- With epinephrine: Up to 3–4 hours
- Full sensation returns: Within 4–5 hours
Dentists often use lidocaine with epinephrine to prolong its effect and reduce bleeding.
How Long Does Lidocaine Injection Last in Gums?
Injecting lidocaine in the gums is standard for fillings, extractions, or root canals.
- Onset: 2–3 minutes
- Numbness duration: 90 minutes to 3 hours
- Post-numbness recovery: Mild tingling for another hour
Tip: Avoid chewing hard foods until sensation fully returns to prevent injuries.
How Long Does Lidocaine Last After Surgery?
Lidocaine is also used during minor surgeries like mole removal or skin biopsies.
- Without epinephrine: 30 minutes to 1 hour
- With epinephrine: 2 to 3 hours
- In major surgeries: it may be combined with longer-lasting agents
After surgery, the numbing effect may linger depending on the dose and site.
How Long Does Lidocaine Injection Last?
Injectable lidocaine is used in various medical fields.
- Average duration: 30 minutes to 3 hours
- Extended versions (e.g., lidocaine with epinephrine): Up to 6 hours
How long lidocaine lasts after an injection also depends on:
- Injection site
- Dosage used
- Presence of vasoconstrictors
How Long Does Lidocaine Last On Skin?
Topical lidocaine creams and gels are used for:
- Minor skin procedures
- Tattoo pain relief
- Itchy or burning skin conditions
Duration:
- Onset: 20 to 30 minutes after application
- Numbing effect: 30 minutes to 1.5 hours
How long does lidocaine last on skin? Usually under 2 hours unless reapplied.
How Long Does Lidocaine Spray Last?
Lidocaine spray is used for:
- Sore throat numbing
- Minor burns
- Hemorrhoid relief
- Pre-sex desensitizing (for PE)
Duration:
- Onset: Immediate
- Effect lasts: 15 to 45 minutes
How long the lidocaine spray lasts may vary based on concentration and how much is used.
How Long Does Lidocaine Last In a Finger?
Lidocaine injections in fingers are used for stitches, fractures, or minor surgeries.
- Average effect: 1 to 2 hours
- With epinephrine: 2 to 3.5 hours
Always avoid tight rings or gloves until the feeling returns.
How Long Does Lidocaine Last In Your System?
Even after the numbness wears off, lidocaine can stay in your system longer.
- Half-life: 90 to 120 minutes
- Total clearance: 12 to 24 hours
- Urine excretion: Through liver metabolism
So, how long does lidocaine last in your system? Up to a full day.
Factors Affecting Numbing Duration
Several variables affect how long lidocaine lasts:
1. Formulation
- Topical, spray, gel, or injectable
- Additives like epinephrine can double the duration
2. Site of Application
- Highly vascular areas (like the mouth) absorb it faster
- Thick skin areas (like the back) hold the effect longer
3. Dosage
- Higher doses last longer but increase side effect risk
4. Metabolism
- Individuals with fast metabolism clear lidocaine quicker
Managing Numbness After Dental Procedures
Numbness after a dental visit can be annoying. Here are some tips:
Do:
- Wait until numbness fades before eating
- Sip warm liquids to boost circulation
- Massage outside the mouth gently
Don’t:
- Chew gum or food while numb
- Touch or bite the numb area
- Drink hot drinks (risk of burns)
FAQs
How long does it take lidocaine to wear off?
Lidocaine typically wears off in 1 to 3 hours, depending on the method used. Topical forms fade faster than injections.
What is the duration of effect of lidocaine?
It can range from 15 minutes to 3 hours, depending on the form—spray, cream, or injection—and whether epinephrine is used.
Does lidocaine heal or just numb?
Lidocaine only numbs. It does not heal or treat the root cause of pain. It’s a temporary pain blocker, not a cure.
How long does 5% lidocaine numb for?
5% lidocaine, often used in patches or creams, can numb an area for up to 1.5 to 2 hours. It varies with skin thickness and area treated.
Summary
So, how long does lidocaine last? The answer depends on many factors: the form, site of application, use of additives, and individual metabolism.
Let’s recap:
- Dentist procedures: 1–3 hours
- On skin: 30 mins to 1.5 hours
- After surgery: Up to 3 hours
- Injections in gums/fingers: 1 to 3.5 hours
- Spray form: 15–45 minutes
In your system: Up to 24 hours