Can I prescribe etoricoxib 90 mg once daily and pregabalin 75 mg twice daily for a patient with lumbar radiculopathy presenting with numbness and pain?

Pregabalin 75 mg BID is appropriate for lumbar radiculopathy, but etoricoxib 90 mg once daily should NOT be used as first-line therapy for radicular pain.

Key Recommendation

For lumbar radiculopathy with neuropathic pain and numbness, start pregabalin 75 mg twice daily (150 mg/day total) as indicated by FDA labeling, but avoid NSAIDs like etoricoxib as monotherapy since evidence for radiculopathy is very limited. 1, 2

Evidence-Based Reasoning

Pregabalin Dosing for Radiculopathy

The FDA-approved dosing for neuropathic pain conditions starts at 75 mg twice daily (150 mg/day), which can be increased to 150 mg twice daily (300 mg/day) within one week based on efficacy and tolerability 2. Your proposed dose of 75 mg BID is the correct starting dose.

However, the evidence for pregabalin in lumbar radiculopathy specifically is problematic:

• New placebo-controlled trials on pregabalin for radicular low back pain had methodological shortcomings and reported inconsistent results (insufficient strength of evidence) 1
• A major randomized controlled withdrawal trial found that while 58% of patients initially responded to pregabalin, there was no significant difference between pregabalin and placebo in time to loss of response during the double-blind phase 3
• A crossover study found that morphine, nortriptyline, and their combination all failed to show benefit in lumbosacral radiculopathy, suggesting this may be a "relatively refractory chronic pain condition" 4

Etoricoxib for Radiculopathy

The evidence does NOT support etoricoxib 90 mg for radicular pain:

• The 2017 ACP guideline systematic review explicitly states that "evidence on pharmacologic therapies for radiculopathy was very limited" 1
• Etoricoxib studies demonstrating efficacy were conducted in chronic non-specific low back pain, not radiculopathy 5, 6
• These are fundamentally different conditions - radiculopathy involves nerve root compression with neuropathic pain, while non-specific low back pain is predominantly nociceptive

The Combination Approach

Recent evidence supports combining pregabalin with etoricoxib, but only for chronic low back pain with a neuropathic component:

• A 2022 phase 3 trial showed the fixed-dose combination of pregabalin prolonged-release 75 mg + etoricoxib 60 mg was significantly more effective than etoricoxib alone for chronic low back pain 7
• A 2026 single-arm study confirmed safety and effectiveness of this combination 8
• Critical caveat: These studies enrolled patients with "chronic low back pain with a neuropathic component," not pure radiculopathy

The combination makes mechanistic sense since it addresses both neuropathic (pregabalin) and nociceptive/inflammatory (etoricoxib) pain components 4.

Clinical Algorithm

For lumbar radiculopathy presenting with numbness and pain:

1. Start pregabalin 75 mg BID (your proposed dose is correct) 2

2. Consider adding etoricoxib 60-90 mg daily ONLY if:

   • There is significant inflammatory/nociceptive component (facet joint involvement, muscle spasm)
   • Patient has mixed chronic low back pain with radicular features
   • Pure neuropathic symptoms alone do NOT justify NSAID use

3. Titrate pregabalin up to 150 mg BID (300 mg/day) within 1 week if pain persists and patient tolerates initial dose 2

4. Maximum pregabalin dose: Can go up to 300 mg BID (600 mg/day) for patients with ongoing pain who tolerate 300 mg/day, though higher doses have more adverse effects 2

Important Caveats

• Dose-dependent adverse effects: Both medications cause more side effects at higher doses. Pregabalin commonly causes dizziness and sedation; etoricoxib carries cardiovascular and GI risks 1, 2

• Renal function: Adjust pregabalin dose if creatinine clearance <60 mL/min 2

• Taper when discontinuing: Pregabalin must be tapered gradually over minimum 1 week 2

• Limited evidence for pure radiculopathy: The combination therapy evidence comes from chronic low back pain studies, not isolated radiculopathy 8, 7

• Alternative first-line options: Consider tricyclic antidepressants (nortriptyline) or gabapentin, which have similar evidence profiles for neuropathic pain 4