Does Lidocaine Help Nerve Pain? A Look at Its Effectiveness

Lidocaine does help nerve pain for many people, though how well it works depends heavily on the type of nerve pain, how the drug is delivered, and the individual patient. The strongest evidence supports topical lidocaine patches for postherpetic neuralgia (the burning pain that lingers after shingles), where it reliably outperforms placebo. For other nerve pain conditions, the picture is more mixed, and the route of delivery matters a great deal.

Why Lidocaine Works Differently on Nerve Pain Than on Normal Sensation

Lidocaine’s basic job is blocking sodium channels on nerve cells, which prevents those cells from firing electrical signals. That is why dentists use it to numb your mouth. But for nerve pain, something more interesting is happening. Damaged nerves behave differently from healthy ones: they fire spontaneously and repetitively, generating pain signals when there is no actual painful stimulus. These misfiring nerves rely on sodium channels that stay open longer than normal.

At the concentrations used for pain treatment, lidocaine preferentially shuts down this abnormal firing while leaving normal nerve signaling mostly intact. In animal studies, systemic lidocaine suppressed the spontaneous discharge coming from injured nerve sites and from the nerve cell bodies near the spinal cord, but it did not block the ability of those same nerves to transmit signals when stimulated normally.¹ Research on nerve fibers with malfunctioning sodium channels has confirmed this selectivity: lidocaine strongly suppressed the abnormal plateau and repetitive firing of damaged nerves without affecting the initial normal spike.²

This selectivity is the reason lidocaine can relieve nerve pain at doses that don’t cause widespread numbness. It is also why lidocaine shares its mechanism with certain seizure medications and heart rhythm drugs, all of which calm overexcitable electrical activity.³

Topical Patches for Postherpetic Neuralgia

Postherpetic neuralgia, the chronic burning or stabbing pain that can persist for months or years after a shingles outbreak, is the condition where lidocaine patches have the most robust track record. A Cochrane review combining available studies found that topical lidocaine relieved pain significantly better than placebo patches.⁴ In one trial, patients stayed on lidocaine patches for a median of more than 14 days before dropping out due to pain return, compared with under 4 days for the placebo patch, and roughly four out of five patients preferred the lidocaine phase of the study.⁵

Beyond pain scores, lidocaine patches improved daily life for postherpetic neuralgia patients in measurable ways. People had less trouble falling asleep, used less sleep medication, woke up less often from pain during the night, and reported better overall quality of life.⁶ For a condition that often grinds people down over weeks and months, these quality-of-life improvements can matter as much as the raw pain-relief numbers.

How Lidocaine Patches Compare to Oral Medications

Pregabalin and gabapentin are among the most commonly prescribed oral drugs for nerve pain, so a natural question is whether lidocaine patches work as well. Only one head-to-head trial has directly compared a lidocaine patch to pregabalin, and the results were revealing for reasons beyond the pain scores. The trial enrolled patients with either postherpetic neuralgia or painful diabetic neuropathy and randomized them to one or the other. Overall, the study could not formally prove that the lidocaine patch was just as effective as pregabalin across the full mixed population. But among the subgroup with postherpetic neuralgia specifically, more patients responded to the lidocaine patch than to pregabalin.⁷

The side-effect comparison was striking. The lidocaine patch group had far fewer adverse events, and the events that did occur were mostly mild, like headache or skin irritation at the patch site. Pregabalin recipients, by contrast, reported a much higher burden of drug-related problems, commonly affecting the nervous system, gut, and general energy levels.⁷ This matters in practice because many people with nerve pain are older adults who are especially vulnerable to the drowsiness, dizziness, and cognitive fog that oral nerve pain medications can cause.

A UK cost-effectiveness analysis found that six months of lidocaine plaster treatment cost less per patient than gabapentin while producing slightly more benefit, making the lidocaine plaster the more cost-effective option in that healthcare system.⁸ A broader review across multiple countries reached a similar conclusion, finding that lidocaine patches offered cost savings compared to both gabapentin and pregabalin.⁹

Diabetic Neuropathy and Other Peripheral Nerve Pain

Painful diabetic neuropathy is one of the most common causes of nerve pain worldwide, and topical lidocaine is used for it even though the formal licensing in most countries covers only postherpetic neuralgia. Lidocaine patches have been identified as a potential treatment option for diabetic neuropathy alongside capsaicin, clonidine, and compounded topical creams, with reviews noting adequate safety and sustained effectiveness during long-term use.¹⁰ The evidence here is thinner than for postherpetic neuralgia, however, and whether patches will help a given patient with diabetic neuropathy depends a lot on the type of pain they are experiencing. Lidocaine patches work best when the pain comes from superficial nerve dysfunction in the skin, rather than from damage to deeper nerve structures.

For nerve pain that develops after surgery, a systematic review found that topical lidocaine may relieve pain and is safe, though its impact on broader quality of life remained unclear.¹¹ The pattern across different nerve pain conditions is consistent: topical lidocaine is generally safe and often helpful, but how much relief it provides varies more than people expect.

Predicting Who Will Respond

One frustrating aspect of nerve pain treatment is that the same medication can work wonderfully for one person and do nothing for another, even when both have the same diagnosis. Researchers have been trying to figure out whether there is a way to predict who will benefit from lidocaine patches before committing to a treatment course.

A study using electrical stimulation of nerve fibers found that patients whose pain-sensing C-fibers were hyperexcitable (responding excessively to brief bursts of stimulation) got significantly more relief from topical lidocaine, averaging a clinically meaningful pain reduction, while patients with normal or underactive nerve fibers saw essentially no improvement.¹² This makes intuitive sense given lidocaine’s mechanism: if your pain is driven by overexcitable nerves firing too easily, a drug that calms overexcitable nerves should help. If your pain comes from a different mechanism entirely, lidocaine may not be the right tool.

The practical takeaway is that lidocaine patches tend to work best when the pain includes features like burning, stinging, or exaggerated sensitivity to touch in the affected area. These symptoms suggest that peripheral nerve hyperexcitability is a major driver of the pain, which is exactly what lidocaine targets.

Trigeminal Neuralgia

Trigeminal neuralgia produces some of the most intense pain known to medicine, typically experienced as electric-shock-like jolts in the face. Lidocaine has been tested here in two main forms: topical patches applied to the face and nerve block injections near the affected branches.

A multicenter randomized trial (the PATCH trial) tested 5% lidocaine patches for trigeminal neuralgia and found that patients wearing the lidocaine patch were significantly less likely to fail treatment during the blinded phase of the study compared to those wearing inactive patches. The treatment failure rate was about half as high with lidocaine, and weekly pain severity also dropped significantly.¹³

Lidocaine nerve block injections near the branches of the trigeminal nerve have also been studied. In one series, about a third of patients responded favorably, with most of those responders achieving complete pain relief that lasted anywhere from a few weeks to over three years.¹⁴ When lidocaine was combined with a corticosteroid in peripheral nerve blocks, patients showed significant reductions in both pain intensity and frequency at one, three, and six months, along with reduced need for their regular oral pain medications.¹⁵ These are not first-line treatments for trigeminal neuralgia, but they represent useful options for people who cannot tolerate or do not respond to the standard oral drugs.

Intravenous Lidocaine Infusions

Giving lidocaine directly into a vein is a more aggressive approach, typically reserved for people with severe chronic nerve pain that has not responded to simpler treatments. The idea is that a systemic dose can reach damaged nerves throughout the body and potentially provide relief lasting days or weeks after the infusion ends.

The evidence here is genuinely mixed. Some studies have found that intravenous lidocaine provides pain relief lasting weeks after administration, with additional anti-inflammatory effects.¹⁶ But a systematic review of the evidence for intravenous lidocaine in chronic neuropathic pain from spinal cord injury, peripheral nerve injury, diabetic neuropathy, postherpetic neuralgia, and complex regional pain syndrome found the data too sparse and inconsistent to make any firm recommendation.¹⁷

A prospective case series looked at this more granularly. Across the entire group of patients receiving lidocaine infusions, mean pain severity did not significantly change. But when the researchers separated responders from non-responders, the responders showed meaningful pain reduction while non-responders saw no change at all.¹⁸ This averaging effect, where strong responders are hidden by non-responders, is a recurring theme in nerve pain research and helps explain why overall trial results can look underwhelming even when the treatment genuinely helps a subset of patients.

Complex Regional Pain Syndrome

Complex regional pain syndrome (CRPS) is a particularly stubborn and debilitating nerve pain condition that often develops after an injury to an arm or leg. Lidocaine infusions have been used for CRPS with some encouraging results at the individual level. In one case series, two-thirds of patients reported adequate pain relief from intravenous lidocaine.¹⁹

A study using a more intensive protocol, continuous lidocaine infusion over five days, found that most patients experienced significant pain reduction lasting an average of three months. Lidocaine appeared to be especially effective for allodynia, the phenomenon where normally painless stimuli like a light touch or a temperature change cause pain. It also reduced the inflammatory components of the syndrome, though it had less effect on motor symptoms like weakness or tremor.²⁰ These are small studies, and CRPS is notoriously variable, but the findings suggest that lidocaine infusion may be a reasonable option when conventional treatments have failed.

The Oral Route and Mexiletine

Because lidocaine cannot be taken by mouth (it gets broken down too quickly by the liver), researchers have used a related drug called mexiletine, which shares lidocaine’s sodium-channel-blocking mechanism but survives the digestive process. In a controlled trial of nerve pain after peripheral nerve injury, mexiletine at 750 mg per day reduced median pain scores from 7 to 4 on a 10-point scale, compared to no change with placebo.²¹

Mexiletine’s problem is not effectiveness but tolerability. A survival analysis of patients prescribed mexiletine found that the median time before patients stopped taking it was just 43 days, with many quitting because of side effects like nausea and dizziness. Interestingly, patients who responded well to an initial test infusion of intravenous lidocaine were significantly more likely to stick with mexiletine long-term.²² This creates a practical screening strategy: try a lidocaine infusion first, and if it helps, mexiletine may be worth attempting as an oral maintenance option.

Safety and Side Effects

One of the main advantages of lidocaine patches over oral nerve pain drugs is that very little of the drug gets into the bloodstream. Pharmacokinetic studies have shown minimal systemic absorption even when patches are worn for 24 hours, and peak blood levels remain far below the threshold for serious toxicity. The most common side effects are mild skin reactions at the patch site: redness, itching, or mild irritation.²³

Intravenous lidocaine carries more risk because it reaches higher blood levels. Side effects can include dizziness, a metallic taste, tingling around the lips, and lightheadedness. At excessive doses, lidocaine can cause seizures or heart rhythm disturbances, which is why infusions are always done in a clinical setting with monitoring. In the CRPS studies mentioned earlier, side effects during carefully dosed infusions were minimal.

Older adults deserve special mention. While lidocaine patches are generally well tolerated in this group, there have been rare reports of confusion or delirium associated with patch use, likely related to individual differences in how the drug is metabolized. This is uncommon enough to be published as a case report, but it is worth knowing about, especially if you are managing pain in an elderly family member who develops unexpected cognitive changes after starting a new patch.

Beyond Sodium Channels

The story of how lidocaine works for nerve pain turns out to be more complex than simple sodium channel blockade. Animal research has revealed that lidocaine also dials down neuroinflammation in the spinal cord. In rats with postherpetic neuralgia, intravenous lidocaine reduced the activation of microglia, the immune cells of the nervous system, in the spinal cord’s pain-processing regions.²⁴ Similar findings have been observed in diabetic neuropathy models, where lidocaine reduced microglial activation through a specific inflammatory signaling pathway.²⁵

When lidocaine was given before nerve injury rather than after, it attenuated the immediate development of pain hypersensitivity by dampening both the abnormal sodium channel changes and the spinal microglial response.²⁶ This anti-inflammatory dimension might help explain why some patients experience pain relief that outlasts the time lidocaine is actually present in the body, as calming the neuroinflammatory cascade could have effects that persist well after the drug itself is gone. It also raises the question of whether early use of lidocaine after nerve injuries (such as surgery) might prevent chronic pain from developing in the first place, though that idea remains largely in the research phase.

When Topical Lidocaine Does Not Help

Combining lidocaine with other topical agents seems logical but does not always pay off. A study testing whether a lidocaine-containing numbing cream (EMLA) could reduce the initial burning caused by topical capsaicin, another nerve pain treatment, found that the lidocaine cream provided only brief relief during the first 15 to 30 minutes. For the remaining five and a half hours of capsaicin treatment, the lidocaine-treated skin was no less painful than the control skin.²⁷ Capsaicin works by depleting nerve endings of a pain-signaling chemical, a process that is inherently irritating and that lidocaine’s sodium-channel blockade cannot fully prevent. If you have been prescribed capsaicin cream and were hoping to pre-numb the area with a lidocaine product, the evidence suggests it will not help much beyond the first few minutes.

More broadly, lidocaine patches are unlikely to help nerve pain that does not originate from hyperexcitable peripheral nerves. If your pain is driven primarily by changes in the brain or spinal cord rather than at the site of nerve damage, a topical treatment that stays mostly in the skin will not reach the problem. This is one reason why identifying the dominant pain mechanism, whether peripheral, central, or mixed, matters for choosing the right treatment. A pain specialist who performs sensory testing can sometimes distinguish these patterns before you invest weeks trying a treatment that is unlikely to work for your particular situation.