Concurrent Use of Pregabalin and Gabapentin

Mechanism and Therapeutic Duplication

Both medications are used for similar indications including neuropathic pain conditions and as adjunctive therapy for partial seizures, according to the Mayo Clinic Proceedings and Ophthalmology 1, 2

Combined use can lead to increased adverse effects including drowsiness, dizziness, fatigue, and ataxia without providing additional therapeutic benefit, as reported in Ophthalmology and Mayo Clinic Proceedings 1, 2

Instead of concurrent use, select either pregabalin or gabapentin based on patient-specific factors, cost considerations, and previous response to either medication, as recommended by Ophthalmology, Mayo Clinic Proceedings, and MMWR Recommendations and Reports 1, 2, 3
If changing from one medication to another, gradually taper the first medication while introducing the second, and monitor for withdrawal symptoms or adverse effects during transition, according to Mayo Clinic Proceedings and The Lancet Psychiatry 2, 4

For gabapentin, dosing typically ranges from 900-3600 mg/day divided into multiple doses, and both medications require dose adjustment in patients with renal impairment, as stated in Mayo Clinic Proceedings and Ophthalmology 1, 2

For patients with inadequate response to a single gabapentinoid at maximum tolerated dose, consider alternative or adjunctive therapies such as tricyclic antidepressants or SNRIs for neuropathic pain, as recommended by Mayo Clinic Proceedings, MMWR Recommendations and Reports, and Ophthalmology 1, 2, 5

The American Geriatrics Society identifies the combination of pregabalin and gabapentin as particularly problematic in older adults due to increased fall risk, and combined use significantly increases the risk of adverse effects including respiratory depression, especially when combined with other CNS depressants 6
Concurrent use with opioids or benzodiazepines further increases risk of serious adverse effects 6

For patients with inadequate response to a single gabapentinoid at maximum tolerated dose, consider duloxetine (60-120 mg/day) for diabetic neuropathic pain 7 8
Alpha lipoic acid may be beneficial for HIV-associated or diabetic peripheral neuropathy 9
Topical agents like lidocaine patch may provide relief with minimal systemic effects 8

In elderly patients, use lower starting doses and slower titration of either medication to minimize adverse effects 6