Can You Take Lyrica (Pregabalin) While on Keppra (Levetiracetam)?
Yes, you can safely take pregabalin (Lyrica) for nerve pain while continuing levetiracetam (Keppra), and emerging evidence suggests this combination may actually provide superior pain relief compared to either medication alone.
Safety Profile of the Combination
The FDA labeling for pregabalin specifically addresses its use in epilepsy patients already taking other antiepileptic drugs (AEDs). In controlled add-on epilepsy trials, patients were treated with 1 to 3 other AEDs alongside pregabalin for up to 12 weeks 1. The safety profile showed no concerning drug-drug interactions, with the most common side effects being dizziness (21%), somnolence (22%), ataxia (15%), and weight gain (12%) 1.
There are no documented pharmacokinetic interactions between pregabalin and levetiracetam - pregabalin has minimal drug interactions because it is not metabolized by the liver and is excreted unchanged in urine 2.
Evidence for Synergistic Benefit
Remarkably, a 2017 preclinical study demonstrated that levetiracetam synergizes with pregabalin in treating diabetic neuropathic pain, allowing for approximately 60-fold dose reductions of both medications when used together 3. This synergistic interaction suggests the combination may be particularly effective, as the drugs target different mechanisms involved in neuropathic pain.
Practical Prescribing Approach
When adding pregabalin to a patient already on levetiracetam:
- Start low: Begin with pregabalin 50 mg three times daily or 75 mg twice daily 2
- Titrate slowly: Increase to 300 mg/day after 3-7 days, then by 150 mg/day every 3-7 days as tolerated 2
- Target dose: 300-600 mg/day divided into 2-3 doses, depending on pain relief and tolerability 2
- Monitor closely: Watch for additive CNS effects (dizziness, somnolence, confusion) since both medications can cause sedation
Key Monitoring Points
Additive side effects to watch for:
- Dizziness and somnolence are the most common issues with pregabalin (occurring in 15-38% depending on dose) 1
- These effects may be more pronounced when combined with levetiracetam
- Consider asymmetric dosing with the larger pregabalin dose at bedtime to minimize daytime sedation 4
Renal function: Both medications require dose adjustment in renal impairment 2. Check creatinine clearance and adjust accordingly.
When This Combination Makes Sense
This combination is particularly appropriate when:
- Levetiracetam is being used for seizure control (not for pain, as levetiracetam alone shows no efficacy for neuropathic pain 5)
- The patient has neuropathic pain conditions where pregabalin has proven efficacy: diabetic peripheral neuropathy, postherpetic neuralgia, or spinal cord injury-related pain 2, 6
- Monotherapy with first-line agents has provided insufficient pain relief
Common Pitfall to Avoid
Do not underdose pregabalin - a study found underdosing occurred in 272 of 300 prescriptions for neuropathic pain 7. Many patients require 300-600 mg/day for adequate pain relief 2. The "low and slow" titration approach should ultimately reach therapeutic doses, not remain at subtherapeutic starting doses 4.
Bottom line: The combination is safe, potentially synergistic, and may allow for lower effective doses of pregabalin than would be needed as monotherapy. Monitor for additive sedation and adjust doses based on pain relief and tolerability.