How Long Does Lidocaine Last? What to Expect After Numbing Injections

Have you recently undergone a dental procedure or a minor surgery, and are concerned about the Lidocaine effects? This fast-acting local anesthetic is known for blocking pain, but how long does Lidocaine last? Understanding how long it provides the relief can help you prepare ahead and ease the concern. Explore the blog and learn how long the effect of this medicine lasts.

How Long Does Lidocaine Last?

Let’s break down how long the effect of Lidocaine lasts based on its formulation:

In general, the effects of lidocaine injections last for 30 minutes to 2 hours, and the topical formulation offers shorter but effective relief.

Factors That Affect the Duration of the Effects of Lidocaine

The duration of Lidocaine's effects can vary based on the following factors:

• Type of Anesthetic: Normal Lidocaine lasts for 1-2 hours, while Lidocaine with epinephrine can extend the numbing effect to 2-4 hours by slowing down its absorption in the bloodstream.

• Dosage and Concentration: Higher dosage and stronger concentrations might lead to a longer numbness effect of Lidocaine.

• Injection Site: Areas with increased blood flow (such as the face) may experience a shorter numbness effect than areas with lower blood flow (like, back part of the mouth).

• Metabolism: Individuals with slow metabolism can gradually break down the anesthetic, prolonging the numbing effect of Lidocaine.

What Happens When Lidocaine's Effect Wears Off?

As the anesthetic effect of Lidocaine subsides, you may start feeling a gradual return of sensation. This process includes tingling sensations, described as feelings of "pins and needles". You will start to feel pressure before the sharp sensation returns. This transition will typically depend on the dose and application method used. 

Tips for Managing Numbness Effects After Using Lidocaine

Follow these measures to manage the numbness:

1. Avoid Consuming Hot Foods or Beverages

Numbness can make it challenging to judge the temperature. So, be extra cautious, as it may burn your mouth. Wait until the numbness fades completely.

2. Avoid Chewing Food

Avoid eating the food until the numbness has fully subsided to prevent accidental biting of your lips, cheeks, or tongue, which can lead to injuries. Children especially need to be properly supervised.

3. Avoid Sucking Actions

Do not smoke or use a straw, as they can interrupt the healing process, particularly if you have undergone a tooth extraction or surgery.

4. Do Not Touch or Poke the Numb Area

Though it may be tempting to touch the numb area, doing so repeatedly can cause damage or injury without realizing it.

5. Schedule Your Surgery Accordingly

If possible, plan your dental procedure or surgery involving the use of Lidocaine so that you can rest afterward, or do not consume food immediately. 

Precautions Before Taking Lidocaine 

If you have any of the following conditions, you must inform your doctor beforehand to  avoid any health complications:

• Issues related to the heart

• Skin infections, damaged or cut skin 

• Allergic reactions to Lidocaine or its ingredients

• If you are pregnant or breastfeeding

Lidocaine Side Effects 

Lidocaine does not usually have intense side effects, but according to MedlinePlus, the following might show up in some individuals:

• Allergic reactions in the skin, like rashes, itching, and swelling in the lips, face, or tongue. 

• Issues in breathing

• Changes in vision 

• Dizziness, confusion, or restlessness

• Drowsiness 

• Fever accompanied by headaches 

• Irregular heartbeat 

• Nausea and vomiting 

• Tremors

When to Contact a Dentist?

While numbness is the normal effect of Lidocaine, see a dentist if you experience:

• Numbness that lasts for more than 24 hours.

• Extreme pain, swelling, or discharge around the treated area (can indicate infection risk).

• Allergic reaction, like breathing difficulty, itching, or rashes (need immediate medical attention).

• Bleeding that does not subside

Note: If in doubt, contacting a dental professional is the best course of action.

Final Takeaway

So, how long does Lidocaine last? The effects of lidocaine injections last for 30 minutes to 2 hours, and the topical formulation offers shorter relief. The duration can vary based on the application method, addition of epinephrine, dosage, injection site, and metabolism. Understanding the safe use of Lidocaine can help manage the pain and plan your medical or dental procedure.

Always follow the post-procedure instructions given by your dentist, take precautions to avoid injury, and contact the medical professionals if you have any concerns about longer numbness or other symptoms.

See Also: How long does lignocaine last