How Long Does It Take for Lidocaine to Wear Off?

Quick Answer

Lidocaine numbness typically wears off in 1–5 hours, depending on the dosage, injection site, and whether epinephrine was included. Dental injections generally resolve faster (1–3 hours), while injections in other parts of the body may last 2–5 hours.

Duration by Application Type

Application	Typical Duration	Notes
Dental (without epinephrine)	1–2 hours	Soft tissue numbness may linger slightly longer
Dental (with epinephrine)	2–3 hours	Lip and tongue numbness can last 3–5 hours
Skin injection (local infiltration)	1–3 hours	Depends on depth and area
Nerve block	2–5 hours	Larger nerves = longer duration
Topical cream/gel	30–60 minutes	Surface-level numbness only
Epidural/spinal	1–3 hours	Combined with other agents in most cases

How Lidocaine Works

Lidocaine is a local anesthetic that works by blocking sodium channels in nerve cells, temporarily preventing pain signals from traveling to the brain. It takes effect within 1–5 minutes of injection and begins wearing off as your body metabolizes and absorbs the drug from the injection site.

The Role of Epinephrine

Many lidocaine formulations include epinephrine (adrenaline), which constricts blood vessels around the injection site. This serves two purposes:

• Extends the duration of numbness by slowing how quickly lidocaine is absorbed into the bloodstream
• Reduces bleeding at the treatment site

When epinephrine is added, the numbing effect can last 30–60 minutes longer than plain lidocaine. This is why dental procedures often use lidocaine with epinephrine, and why your lip and tongue may feel numb for several hours after a filling or extraction.

Factors That Affect How Long Numbness Lasts

Several variables influence the duration of lidocaine's effects:

• Dosage: Higher concentrations and larger volumes last longer
• Injection site: Areas with more blood flow (like the tongue) metabolize lidocaine faster than areas with less blood supply
• Individual metabolism: Some people process lidocaine faster than others based on liver function, age, and overall health
• Body weight: Larger individuals may metabolize the drug differently
• Inflammation: Infected or inflamed tissue may reduce lidocaine's effectiveness and duration due to the acidic environment

What to Do While Numb

After dental procedures, take care to avoid biting your lip, tongue, or cheek while they are still numb. Avoid hot beverages and foods until sensation returns. For children, this is particularly important, as they may chew on numb tissue without realizing it.

Speeding Up Recovery

There is no reliable home remedy to make lidocaine wear off faster. However, some dentists can administer OraVerse (phentolamine mesylate), a reversal agent that restores normal sensation about twice as fast as waiting for lidocaine to wear off naturally. Gentle activity and warmth to the area may slightly increase blood flow and speed metabolism of the anesthetic.

When to Be Concerned

If numbness persists for more than 8 hours after a dental procedure or more than 6 hours after a local injection, contact your healthcare provider. Prolonged numbness could indicate nerve irritation or damage, which is rare but may require follow-up.

Bottom Line

Lidocaine typically wears off within 1–5 hours, with dental applications on the shorter end and nerve blocks lasting longer. The addition of epinephrine extends the duration. Numbness is temporary and resolves on its own as the body metabolizes the anesthetic.