What is the first‑line medication for an adult with posterior neck pain radiating to the forearm and brachioradialis?

Gabapentin or Pregabalin

For an adult with posterior neck pain radiating to the forearm and brachioradialis region (cervical radiculopathy), start with gabapentin as the first-line medication, beginning at 100-300 mg nightly and titrating to 900-3600 mg daily in divided doses, or alternatively pregabalin 50 mg three times daily, increasing to 100 mg three times daily.

Clinical Reasoning

This presentation describes cervical radiculopathy - nerve root compression causing radiating pain from the neck down the upper limb. The involvement of the brachioradialis distribution suggests C6 nerve root involvement. This is neuropathic pain requiring specific pharmacologic management.

First-Line Treatment: Gabapentinoids

The evidence strongly supports gabapentin or pregabalin as first-line therapy for neuropathic pain 1. These calcium channel α2-δ ligands are specifically recommended for:

• Gabapentin: Start 100-300 mg at bedtime, increase by 50-100% every few days to target dose of 900-3600 mg daily in 2-3 divided doses 2
• Pregabalin: Start 50 mg three times daily, increase to 100 mg three times daily (maximum 600 mg/day) 2

Pregabalin may be preferred initially due to more predictable absorption and simpler titration schedule 1. Both require dose adjustment in renal insufficiency and slower titration in elderly patients 2.

Alternative First-Line Options

If gabapentinoids are contraindicated or not tolerated, consider:

Tricyclic antidepressants (TCAs): Secondary amines (nortriptyline or desipramine) are better tolerated than tertiary amines 1

• Start nortriptyline 10-25 mg nightly, increase to 50-150 mg nightly 2
• Screen with ECG if patient >40 years old; use caution with cardiac disease 1
• Takes 6-8 weeks for adequate trial 1

SNRIs: Duloxetine 30-60 mg daily or venlafaxine 50-75 mg daily, increasing to 75-225 mg daily 2

What NOT to Use First

NSAIDs are NOT appropriate for neuropathic/radicular pain. While oral NSAIDs may help neck pain itself 3, they do not address the neuropathic component of radiculopathy. Evidence shows NSAIDs have inconsistent effectiveness for radiculopathy 3.

Opioids should NOT be first-line for chronic neuropathic pain 4. Reserve for acute severe pain or when first-line therapies fail, and only as time-limited trials 4.

Combination Therapy Approach

If partial response to gabapentinoid monotherapy after adequate trial (2-4 weeks at target dose):

1. Add a TCA or SNRI to the gabapentinoid 1
2. Consider topical lidocaine 5% patch if pain is localized 2
3. If still inadequate, refer to pain specialist 1

Critical Pitfalls to Avoid

• Don't undertitrate: Many patients need higher gabapentin doses (2400-3600 mg/day) for efficacy 4
• Don't abandon too quickly: Allow 2 weeks at maximum tolerated dose before declaring treatment failure 1
• Don't ignore side effects: Somnolence, dizziness, and cognitive clouding are common with gabapentinoids, especially in elderly 5. Start low, go slow.
• Don't forget renal dosing: Both gabapentin and pregabalin require dose reduction in renal impairment 2, 5

When to Escalate

If first-line medications fail after adequate trials alone and in combination, consider 1:

• Referral to pain specialist or multidisciplinary pain center
• Evaluation for interventional procedures (epidural steroid injections, nerve blocks)
• Surgical consultation if progressive neurologic deficit or severe refractory pain

The evidence base for cervical radiculopathy specifically is limited 1, but extrapolation from other neuropathic pain conditions (diabetic neuropathy, postherpetic neuralgia) supports this algorithmic approach 1.