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Why does peripheral neuropathy cause pain

Managing Neuropathic Pain
Steven Scherer, MD, PhD
Revised October 20, 2008
Why does peripheral neuropathy cause pain?
Peripheral nerves are a collection of nerve fibers that originate from many different kinds of
neurons. Motor fibers originate from motor neurons that are located in the spinal cord. Sensory
axons originate from neurons that are located outside the spinal cord in large clusters called
ganglia. The ganglia that contain the sensory neurons for the leg are located in the low back region
(called the lumbar and sacral levels); those for the arm are located in the neck (called the cervical
region). Each of these ganglia contains many thousands of sensory neurons.
Every sensory neuron has two ends. One end is connected to a tissue in the body (a piece of skin,
muscle, bone, etc.), and the other end is connected to the spinal cord. Under normal circumstances,
sensations are generated only upon stimulation of the end of the nerve fiber that is in the body.
Then sensory nerve fibers relay this information to the spinal cord, and cells in the spinal cord, in
turn, relay this information to the brain.
There are many kinds of sensory neurons. This is why we can perceive so many different
sensations. All of us can appreciate many of these sensations, such as heat, cold, light touch, pin
prick, vibration, and movements of the hairs on our skin. Other sensations are less obvious, such as
our ability to determine movements of our arms and legs. Each kind of sensation, including pain, is
conveyed to the spinal cord by certain kinds of sensory neurons.
So what does this have to do with pain? It is likely that some kinds of neuropathy damage the
sensory fibers that convey pain, causing them to be hyperactive even in the absence of stimulation.
In other words, damaged “hyperactive pain fibers” trick the brain into perceiving a painful stimulus
even though none is present. The hyperactive fibers may not even be properly connected to their
tissue, thereby accounting for why people can experience pain in their numb feet or legs.
It should be clear that not all pain is caused by neuropathy, even in people who have peripheral
neuropathy. The pain or arthritis and headache, for example, are conveyed, but are not caused, by
sensory fibers. Even the pain caused by one of the foot deformities caused by neuropathies is not
caused by damaged sensory fibers; the sensory fibers are merely conveying the information to the
spinal cord. Conversely, not all people who have peripheral neuropathy have painful symptoms.
Pain is a common symptom in some kinds of neuropathy, such as diabetic neuropathy, in which
small sensory fibers may be disproportionately affected. Among people who have inherited
neuropathy, pain is much less frequently in the demyelinating forms than in the axonal forms
affecting small sensory fibers.
The principles of treating painful peripheral neuropathies.
If neuropathy causes pain that is diminishing the quality of life, then this symptom should be
treated. In my view, to manage pain effectively, there has to be a partnership between the patient
and the physician. The patient needs to understand their pain - when it occurs, how well the drugs
work, the side effects of the medications (particularly how troubling they are) - and communicate
these things to the physician. The physician needs to know the medications and the relevant
information about them - their duration, common side effects, potential interactions with other
drugs, and whether a patient has other complicating medical problems - and communicate these
things to the patient.
The goal is maximize the patient’s quality of life. In practical terms, the patient should take the
amount of medication that effectively manages the pain, but that does not cause unacceptable side
Managing Neuropathic Pain
Steven Scherer, MD, PhD
Revised October 20, 2008
effects. In the ideal case, the patient would be pain-free without any side effects. In the worst case,
the patient has intolerable side effects at a dose that produces no pain relief whatsoever. In the
typical case, however, there is a dose of a medication that provides some pain relief but that also
causes some side effects. It should be clear that only the can patient know whether a medication
works and whether it has acceptable side effects.
Medications for treating painful peripheral neuropathies.
Many medications have been reported to work for painful peripheral neuropathies (Mendell and
Sahenk, 2003; Wolfe and Trivedi, 2004). Most have been studied in clinical trials, such as
gabapentin (Lesser et al., 2004), desipramine (Max et al., 1992), oxycontin (Gimbel et al., 2003),
and Lyrica (pregabablin) or Cymbalta (duloxetine HCl) for painful diabetic neuropathy, but FDA
approval (a long and EXPENSIVE process) for this “indication” (namely, painful diabetic
neuropathy) has been granted only for Lyrica and Cymbalta. That does not mean that the other
medications don’t work; it means that the physicians are forced to prescribe medications that have
not been FDA approved for treating painful neuropathies. To make matters worse, many insurance
companies WILL NOT PAY FOR Lyrica or Cymbalta (even Oxycontin) unless that patients have
exact what the FDA approved – a painful neuropathy caused by diabetes.
Which medication to try first is an important question. In one recent consensus statement of pain
experts (Dworkin et al., 2007); but also see the editorial (Cherny, 2007), “certain antidepressants
(i.e., tricyclic antidepressants and dual reuptake inhibitors of both serotonin and norepinephrine),
calcium channel α2-δ ligands (i.e., gabapentin and pregabalin), and topical lidocaine” were
considered first-line treatments, with opioids as “generally second-line treatments”. “Third-line
treatments but that could also be used as second-line treatments in some circumstances include
certain antiepileptic and antidepressant medications, mexiletine, N-methyl-D-aspartate receptor
antagonists, and topical capsaicin.” What this expert panel is saying is to try first-one medications
first, second-line medications second, and so on, but also that “Medication selection should be
individualized, considering side effects, potential beneficial or deleterious effects on comorbidities,
and whether prompt onset of pain relief is necessary.”
Regardless of the medication, the logic I use is the same:
• Introduce one medication at a time. Changing the doses of two medications simultaneously
makes it difficult to determine which medication is responsible for any given effect (especially a side effect). • Use a gradually escalating dose of one medication until either good pain relief is obtained or intolerable side effects occur. This is the key concept; too often I have seen patients who have been taking potentially effective medications but at doses that neither help the pain nor cause significant side effects. • If one medication fails, try another one. • ALL OF THESE MEDICATIONS CAN CAUSE DROWSINESS. YOU SHOULD NOT DRIVE OR DO OTHER POTENTIALLY HAZARDOUS TASKS (SUCH AS OPERATE MACHINERY) UNTIL YOU FEEL COMFORTABLE WITH A NEW MEDICATION OR AN INCREASED DOSE OF A MEDICATION THAT YOU ARE ALREADY TAKING.
The medications that work for neuropathic pain fall into a few groups:
1. Tricyclics
Classical tricyclics: amitriptyline (brand name, Elavil), nortriptyline, desipramine (brand
name, Norpramin), doxepin
. These drugs were originally used as anti-depressants, typically at
Managing Neuropathic Pain
Steven Scherer, MD, PhD
Revised October 20, 2008
much higher doses than are used for treating painful neuropathies. They probably reduce pain
because they block norepinephrine reuptake (but they block the reuptake of serotonin, too). They
are usually taken once a day, an hour or so before sleep, as they are slowly metabolized (thus taken
once/day) and often cause some degree of drowsiness/sedation (and thus are taken before sleep).
Desipramine is an exception, as patients may actually have trouble sleeping if they take it at
bedtime; in that case, I recommend that they take in the morning. The drowsiness is often a useful
side effect when pain interferes with sleep. One typically starts with a low dose (25 mg or even 10
mg) and "builds up" the dose until either a good effect has been achieved or there are intolerable
side effects (typically 50-100 mg). The effective dose may vary because the speed at which the
drug is broken down varies from person to person. Besides drowsiness, a dry mouth and cognitive
side effects are common (and there are other side effects, too). It is important to know that the
tricyclics typically take 2-4 weeks to reach their full effectiveness against pain, and that the severity
of the side effects often diminishes over time. According to the PDR, there have been some cases
of severe reactions in patients taking Monoamine Oxidase Inhibitors (MAOIs), so one should wait
2 weeks after discontinuing an MAOI before starting a tricyclic.
Derivative tricyclics: bupropion (brand name, Wellbutrin/Zyban): This is a "second
generation" non-tricyclic antidepressant, but is thought to work in same way as tricyclic
antidepressants against pain - by blocking norepinephrine reuptake (it also blocks dopamine
reuptake, too). In a recent paper, (Semenchuk et al., 2001), found that bupropion SR 150 mg twice
a day, was more effective than placebo for neuropathy pain. Use with caution in patients who have
liver disease. According to the PDR, bupropion has the highest propensity of any tricyclic for
causing seizures. The risk is higher at higher doses, and is minimized at doses 450 mg/day or less
(less than 1% of treated patients). Bupropion is contraindicated in patients who have a current or
prior diagnosis of anorexia or bullemia, as this increases the risk of seizure. According to the PDR,
one should wait 2 weeks after discontinuing an MAOI before starting bupropion.
2. Gabapentin and Pregabalin
Gabapentin (brand name, Neurontin)
. (Lesser et al., 2004) This medication is not approved for
the treatment of chronic pain, but is probably more widely used for this reason than for the
treatment of its approved indication, epilepsy. It was designed to be a long-lasting mimic of a
neurotransmitter, GABA, but probably acts on pain by an unexpected effect on a subunit of a
calcium channel. Neurontin comes in 100, 200, and 300 mg capsules; these are taken every 6-8
hours (the dose to be determined by its efficacy and side effects!). Cognitive changes are the most
common side effect. It also causes edema (fluid retention). In at least one clinical trial, Neurontin
worked as reliably as amitriptyline (Morello et al., 1999). Neurontin plus a long acting narcotic
may work better than either alone (Raja and Haythornthwaite, 2005). Directions for taking this
medication are found on page 6. It may be advisable to taper Neurontin over a week or more, or the
abrupt discontinuation of Neurontin may rarely cause problems.
Pregabilin (brand name, Lyrica) was approved for diabetic neuropathy pain on 12/31/04. It is
chemically highly related to Neurontin, but can be taken on a every 12 hour basis. Come in
capsules: 25mg, 50 mg, 75 mg, 100 mg, 150 mg, 200 mg, 225 mg, and 300 mg. Side effects are
similar to Neurontin (somnolence, dry mouth, peripheral edema, weight gain) (Rosenstock et al.,
2004). In an advertisement for Lyrica, I found the following statements: “LYRICA should be
discontinued gradually over a minimum of 1 week. Higher frequency of weight gain and edema
was observed in patients taking both LYRICA and thiazolidinedione antidiabetic drugs. Caution
should be exercised when coadministering these drugs. LYRICA may exacerbate the effects of
Managing Neuropathic Pain
Steven Scherer, MD, PhD
Revised October 20, 2008
oxycodone, lorezepam, or ethanol on cognitive and gross motor functioning. Patients with a history
of drug or alcohol abuse may have a higher chance of misuse or abuse of LYRICA.” “Patients
taking LYRICA should be counseled that dizziness and somnolence may impair their ability to
perform potentially hazardous tasks such as driving or operating complex machinery until they
have sufficient experience with LYRICA to determine its effect on cognitive and motor function.”
None of the advertisements or the PDR recommended a specific dose, but patients took up to 300
mg twice a day in the clinical trials. I suggest starting at 75 mg twice day and increasing as
tolerated - 150 mg twice day; 225 mg twice a day, then 300 mg twice a day.
3. Narcotics
The keys for using narcotics are matching the duration of action to the duration of pain, and letting
the patient figure out the dose that provides adequate pain relief with acceptable side effects.
Narcotics may work well with Tricyclics or Neurontin (Raja and Haythornthwaite, 2005) for relief
of neuropathic pain. Narcotics cause drowsiness, and have other side effects, too (constipation, for
one). There are many kinds of long acting narcotics, but I mostly use Oxycontin:
MS Contin (the active ingredient is morphine; 15, 30, 60, 100, 200 mg tablets); works for
Avinza (the active ingredient is morphine; capsules); works for about 24 hours.
Kadian (the active ingredient is morphine; 20, 30, 50, 60, 80, 100, 200 mg capsules); works
Oxycontin (the active ingredient is oxycodone; 10, 15, 20, 30, 40, 60, 80, and 160 mg
tablets); works for about 12 hours. You will have to increase the dose of oxycontin until you
are "in the window" where pain relief outweighs side effects. Try an every 8 hour dosing
schedule, and use 10 mg increments. Thus 10-10-10, then 10-20-10, then 10-20-20, and so
on. You can take the increment wherever it will help the pain the most; if the pain is worse
at night, then increase the last dose of the day. Oxycontin is effective in painful diabetic
neuropathy (Gimbel et al., 2003; Watson et al., 2003). YOU SHOULD SWALLOW THE
WHOLE PILL; DO NOT BREAK, CHEW, OR CRUSH THE PILL as that releases
all of the drug at once.

Duragesic patches: The active ingredient is fentanyl; comes in 25 micrograms/hr (10cm2),
50 micrograms/hr (20cm2), 75 micrograms/hr (30cm2), and 100 micrograms/hr (40cm2). One patch works for 2-3 days. The FDA has recently summarized some contraindications about using a fentanyl patch , including the recommendation that the patch should not be used in non-opioid-tolerant patients (the drug levels may build up). • Levorphanol:
Methadone (dolophine hydrochloride). Methadone has been used to treat chronic pain,
including painful neuropathy (Moulin et al., 2005), but I have not used methadone myself because its long half-life and variable metabolism from patient-to-patient (the drug levels may build up). • Tramadol (brand name, Ultram; Ultracet is Tramadol and acetomeniphen). Comes in 50
mg pills; take up to 100 mg every 8 hours. There is a risk of seizures with Tramadol, and this is increased by concurrent use of selective serotonin uptake inhibitors (SSRIs), and likely non-selective (norepinephrine and serotonin) uptake inhibitors like Effexor and Cymbalta (see below) and MAOIs. Managing Neuropathic Pain
Steven Scherer, MD, PhD
Revised October 20, 2008
I typically ask patients to use a short-acting narcotic (usually oxycodone) for discrete episodes of pain (“break through pain”); these can be used in conjunction with long-acting narcotics. • Oxycodone, which lasts 3-4 hours. Comes in 5 mg pills.
Hydrocodone (the active ingredient in Vicodin). As far as I have been able to determine, all
forms of hydrocodone sold in the USA also contain acetaminophen (the ingredient in Tylenol) – hydrocodone 10 mg/325 mg acetaminophen or hydrocodone 10 mg/650 mg acetaminophen. Because acetominophen is ineffective for neuropathic pain, and can cause liver damage at high doses, I prefer not to use this combination. (Why take a medication that doesn’t work, especially one with potential adverse effects.) 4. “Mixed” serononin and norepinephrine reuptake inhibitors.
There are several of these, but only Duloxetine HCl (Cymbalta) has been approved by the FDA for
the management of diabetic neuropathic pain (Wernicke et al., 2006). According to the PDR, don’t
take these medications if you are taking an MAO inhibitor, have severe renal insufficiency or
hepatic disease, or “have substantial alcohol use”. According to the PDR, one should wait 2 weeks
after discontinuing an MAOI before starting one of these medications.
Duloxetine HCl (brand name Cymbalta): comes in 20, 30, and 60 mg capsules. Start at
20 or 30 mg/day, may increase up to 60 mg twice a day. • Venlafaxine (brand name Effexor): Start at a low dose 37.5 or 75 mg; increase dose to
maximun of 375 mg/day (Rowbotham et al., 2004).
5. Sodium channel blockers
IN THE FUTURE, BLOCKERS OF SPECIFIC TYPES OF SODIUM CHANNELS MAY PROVE
TO BE THE BEST EVER TREATMENT FOR NEUROPATHIC PAIN, AS THESE SODIUM
CHANNELS ARE FOUND SPECIFICALLY ON THE AXONS THAT CONVEY PAIN TO THE
BRAIN. Unfortunately for everyone, the future is not today.
Oxcarbazepine (brand name Trileptal). This is similar to Carbamazepine (brand name Tegretol),
but probably with lower side effects and definitely more expensive. Comes in 150, 300, and 600
mg pills. The starting dose is 300 mg every 12 hours; this can be increased as tolerated (by 300
mg/day) to a maximum 1200 mg every 12 hours. Oxycarbazepine did not work in one clinical trial
of patients with painful diabetic neuropathy (Grosskopf et al., 2006).
Lamotrigine (brand name Lamictal). This medication is used for treating seizures and is not
approved for the treatment of chronic pain, although it has been reported to work and may be
uniquely effective for pain following thalamic strokes (Semenchuk et al., 2001). For epilepsy, the
usual daily dose is 100 to 400 mg/day, either on a once-a-day or a twice-a-day schedule.
Topiramate (brand name Topamax) (Raskin et al., 2004) This medication is used for treating
seizures and preventing migraines, but is not approved for the treatment of chronic pain. It has been
used to treat neuropathic pain, but its efficacy appears minimal (Thienel et al., 2004). Side efforts:
trouble thinking, slowed thinking, “tiredness” are pretty common, and are typically related to the
dose. One potentially beneficial side effect is that weight loss (probably because people eat less).
Mexilitine (Oskarsson et al., 1997). This is another sodium channel blocker, but I have not used it.

Lidocaine.
Lidocaine is the drug that dentists use to block pain (and other sensation) during dental
procedures. Topical (applied to the skin) preparations of lidocaine that have been used to treat
Managing Neuropathic Pain
Steven Scherer, MD, PhD
Revised October 20, 2008
neuopathic pain, including the Lidoderm patch. EMLA cream is another kind of topical local
anesthetic.

6. Anti-inflammatories
.
There are basically two kinds of anti-inflammatory medications – corticosteroids (these are
different than the performance-enhancing “steroids” used by athletes) and non-steroidal anti-
inflammatory drugs (NSAIDs).

NSAIDs
:
• Aspirin, including Ecotrin. Aspirin or other salicylates are an active ingredient in many
combination medications, including Excedrin, Disalcid. • There are many newer NSAIDs - Anaprox/naproxen, Clinoril, Daypro, Feldene, Indocin/indomethacin, Lodine, Motrin/ibuprofen, Naprosyn, Orudis, Relafen, Tolectin, Toradol/ketoprofen, Voltaren, Mobic Aspirin, and NSAIDs are not effective for the treatment of neuropathy pain, but they do work on
radicular pain (caused by “pinched nerves”) as well as arthritis, tendonitis, and a host of other
conditions.

Corticosteroids.
Prednisone, prednisolone, and decadron are examples of corticosteriods. These
drugs are used for the long-term treatment of some chronic inflammatory conditions, but are more
commonly used for short-term conditions. Corticosteroids should not be used to treat painful
neuropathies, unless the underlying cause of the neuropathy is an inflammatory condition.
Neurontin/Gabapentin
: Neurontin comes in 100, 200, and 300 mg capsules; these are taken every
6-8 hours. There is no magic dose, especially for symptomatic treatment. I recommend starting
with one pill (300 mg) at bedtime, and increasing the dose every day by 1 pill; space the pills 8
hours apart. If side effects develop, do not increase the dose any further without informing me, or
cut back. In my experience, it usually becomes clear whether Neurotin will work by the time one
takes 1200 mg every 8 hours (3600 mg/day). The dose that you ultimately take depends on the
following idea: increase the dose until it is effective or you are having significant side effects
(trouble thinking, slowed thinking, “tiredness” will eventually occur at some dose). A drug
rash/allergy is also possible, but unusual for Neurontin.
day
Managing Neuropathic Pain
Steven Scherer, MD, PhD
Revised October 20, 2008

References
Cherny NI (2007) The treatment of neuropathic pain: From hubris to humility. Pain 132:225-226.
Dworkin RH, OConnor AB, Backonja M, Farrar JT, Finnerup NB, Jensen TS, Kalso EA, Loeser
JD, Miaskowski C, Nurmikko TJ, Portenoy RK, Rice ASC, Stacey BR, Treede RD, Turk DC, Wallace MS (2007) Pharmacologic management of neuropathic pain: Evidence-based recommendations. Pain 132:237-251. Gimbel JS, Richards P, Portenoy RK (2003) Controlled-release oxycodone for pain in diabetic neuropathy. A randomized controlled trial. Neurology 60:927-934. Grosskopf J, Mazzola J, Wan Y, Hopwood M (2006) A randomized, placebo-controlled study of oxcarbazepine in painful diabetic neuropathy. Acta Neurol Scand 114:177-180. Lesser H, Sharma U, LaMoreaux L, Poole RM (2004) Pregabalin relieves symptoms of painful diabetic neuropathy - A randomized controlled trial. Neurology 63:2104-2110. Max MB, Lynch SA, Muir J, Shoaf S, Smoller B, Dubner R (1992) Effects of desipramine, amitriptyline, and fluoxetine on pain in diabetic neuropathy. N Eng J Med 326:1250-1256. Mendell JR, Sahenk Z (2003) Painful sensory neuropathy. N Engl J Med 348:1243-1255. Morello CM, Leckband SG, Stoner CP, Moorhouse DF, Sahagian GA (1999) Randomized double- blind study comparing the efficacy of gabapentin with amitriptyline on diabetic peripheral neuropathy pain. Arch Intern Med 159:1931-1937. Moulin DE, Palma D, Watling C, Schulz V (2005) Methadone in the management of intractable neuropathic noncancer pain. Can J Neurol Sci 32:340-343. Oskarsson P, Ljunggren JG, Lins PE, Bolinder J, Bystedt T, Engstrom L, Olsson PO, Gamstedt A, Fagerberg SE, Nordlander S, Gertow O, Lennerhagen P, Lithner F, Svedberg E, Hartikkainen P, Makinen T (1997) Efficacy and safety of mexiletine in the treatment of painful diabetic neuropathy. Diabetes Care 20:1594-1597. Raja SN, Haythornthwaite JA (2005) Combination therapy for neuropathic pain - Which drugs, which combination, which patients? N Engl J Med 352:1373-1375. Raskin P, Donofrio PD, Rosenthal NR, Hewitt DJ, Jordan DM, Xiang J, Vinik AI (2004) Topiramate vs placebo in painful diabetic neuropathy - Analgesic and metabolic effects. Neurology 63:865-873. Rosenstock J, Michael TB, LaMoreaux L, Sharma U (2004) Pregabalin for the treatment of painful diabetic peripheral neuropathy: a double-blind, placebo-controlled trial. Pain 110:628-638. Rowbotham MC, Goli V, Kunz NR, Lei D (2004) Venlafaxine extended release in the treatment of painful diabetic neuropathy: a double-blind, placebo-controlled study. Pain 110:697-706. Semenchuk MR, Sherman S, Davis B (2001) Double-blind, randomized trial of bupropion SR for the treatment of neuropathic pain. Neurology 57:1583-1588. Thienel U, Neto W, Schwabe SK, Vijapurkar U (2004) Topiramate in painful diabetic polyneuropathy: findings from three double-blind placebo-controlled trials. Acta Neurol Scand 110:221-231. Watson CPN, Moulin D, WattWatson J, Gordon A, Eisenhoffer J (2003) Controlled-release oxycodone relieves neuropathic pain: a randomized controlled trial in painful diabetic neuropathy. Pain 105:71-78. Wernicke JF, Pritchett YL, DSouza DN, Waninger A, Tran P, Iyengar S, Raskin J (2006) A randomized controlled trial of duloxetine in diabetic peripheral neuropathic pain. Neurology 67:1411-1420. Wolfe GI, Trivedi JR (2004) Painful peripheral neuropathy and its nonsurgical treatment. Muscle Managing Neuropathic Pain
Steven Scherer, MD, PhD
Revised October 20, 2008

Source: http://cmtausa.org/membdocs/Managing_Neuropathic_Pain_Dr_Steven_Scherer.pdf

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