What is the appropriate treatment for peripheral neuropathy?

Treatment of Peripheral Neuropathy

For painful peripheral neuropathy, start with pregabalin, duloxetine, or gabapentin as first-line pharmacologic treatment, with the choice guided by patient comorbidities and contraindications. 1

Treatment Algorithm

Step 1: Address Underlying Cause

• Optimize glycemic control in diabetic patients to prevent or delay neuropathy development (type 1 diabetes) and slow progression (type 2 diabetes) 2, 1
• Rule out and treat reversible causes: vitamin B12 deficiency, hypothyroidism, alcohol toxicity, neurotoxic medications, renal disease 2, 3
• For HIV-associated neuropathy, initiate antiretroviral therapy early 4

Step 2: First-Line Pharmacologic Treatment for Pain

Choose ONE of the following based on patient factors:

Pregabalin or Gabapentin (α2-δ ligands)

• Pregabalin: 150-600 mg/day 5
• Gabapentin: titrate to 1200-2400 mg/day in divided doses 4, 6
• Contraindications: Edema, unsteadiness/falls risk 7
• Note: Only 38% achieve ≥50% pain reduction with gabapentin 1200 mg daily 6

Duloxetine (SNRI)

• Dose: 30-60 mg/day 5
• Contraindication: Hepatic disease 7

Amitriptyline (TCA)

• Contraindications: Glaucoma, orthostatic hypotension, cardiovascular disease, unsteadiness/falls risk 7
• Causes weight gain 7
• Note: Failed to show efficacy in HIV-associated neuropathy 8

Step 3: If Inadequate Response to First-Line Monotherapy

Add or switch to:

• SNRIs (duloxetine, venlafaxine) if started with gabapentinoids 4, 7
• Gabapentinoids if started with SNRIs or TCAs 7
• Tricyclic antidepressants (nortriptyline preferred over amitriptyline for better tolerability) 4, 7

Combination therapy: Gabapentin + morphine at low doses is more effective than either at higher doses alone 7. Nortriptyline + gabapentin together are more efficacious than either alone 7

Step 4: Topical Treatments (Can Be Used First-Line or Adjunctively)

Capsaicin 8% patch

• Single 30-minute application provides pain relief for ≥12 weeks 4
• Apply 4% lidocaine for 60 minutes before capsaicin to reduce application pain 4
• Strong evidence for HIV-associated peripheral neuropathic pain 4

Lidocaine 5% medicated plaster

• Licensed for post-herpetic neuralgia 9
• Minimal systemic adverse events 9

Step 5: Second-Line Options

Opioids (tramadol, morphine, oxycodone)

• Should NOT be first-line for chronic neuropathic pain 4
• Reserve for refractory cases 7
• Use tramadol for chronic pain management 5

Alpha-lipoic acid

• 600 mg IV daily for 3 weeks reduces neuropathic pain 7
• Supported by meta-analysis for diabetic neuropathy 4, 7

Step 6: Refractory Cases

• High-frequency (10 kHz) spinal cord stimulation for medication-refractory painful diabetic neuropathy 10
• Electrical spinal cord stimulation for extreme cases unresponsive to pharmacotherapy 7

Critical Contraindications to Avoid

Comorbidity	Avoid
Glaucoma	TCAs [7]
Cardiovascular disease	TCAs [7]
Orthostatic hypotension	TCAs [7]
Hepatic disease	Duloxetine [7]
Edema	Pregabalin, gabapentin [7]
Falls risk	TCAs, pregabalin, gabapentin [7]

Important Caveats

• Monitor medication response objectively and periodically because adverse effects are common and desired pain reduction may not occur 11
• Evidence for long-term benefit and safety of first-line options is lacking 11
• HIV-associated neuropathy, chemotherapy-induced neuropathy, and lumbosacral radiculopathy may be relatively refractory to standard first-line treatments 8
• Avoid high-dose vitamin C as it may interfere with bortezomib metabolism 5
• Avoid high-dose pyridoxine (vitamin B6) especially with renal insufficiency 5
• Lamotrigine is NOT recommended for HIV-associated neuropathic pain 4

Non-Pharmacologic Adjuncts

• Physical and occupational therapy 4
• Exercise and sensorimotor training 12
• Transcutaneous electrical nerve stimulation (TENS) - well-tolerated, inexpensive, modest benefits 11
• Hypnosis for neuropathic pain 4
• Yoga for chronic pain 4