Drug interactions
Gabapentin + Pregabalin
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Overview
Pharmacodynamic duplication of gabapentinoids can lead to additive CNS depression (sedation, dizziness, ataxia, cognitive impairment) and may increase risk of respiratory depression and peripheral edema.
Mechanism of action
Pharmacodynamic: both bind α2δ subunit of voltage-gated calcium channels leading to additive CNS/respiratory depressant effects; no significant pharmacokinetic interaction (both renally eliminated unchanged).
Clinical management
Avoid therapeutic duplication when possible. If transitioning, cross-taper rather than combine. If concomitant use is unavoidable, use lowest effective doses, adjust for renal function, and monitor for excessive sedation, respiratory depression, falls, and edema.
Drug reference
References
- FDA Drug Safety Communication: Serious breathing difficulties with gabapentin and pregabalin in patients with respiratory risk factors or when used with CNS depressants — FDA Label
- Pregabalin (Lyrica) Prescribing Information — FDA Label
- Gabapentin (Neurontin) Prescribing Information — FDA Label
- Pregabalin: Drug interactions and adverse effects — Lexicomp
- Gabapentin: Drug interactions and adverse effects — Lexicomp
Frequently asked questions
Can I take Gabapentin with Pregabalin?
The interaction is rated: Moderate. Pharmacodynamic duplication of gabapentinoids can lead to additive CNS depression (sedation, dizziness, ataxia, cognitive impairment) and may increase risk of respiratory depression and peripheral edema.
How serious is the interaction between Gabapentin and Pregabalin?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between Gabapentin and Pregabalin managed?
Avoid therapeutic duplication when possible. If transitioning, cross-taper rather than combine. If concomitant use is unavoidable, use lowest effective doses, adjust for renal function, and monitor for excessive sedation, respiratory depression, falls, and edema.
Why do Gabapentin and Pregabalin interact?
Pharmacodynamic: both bind α2δ subunit of voltage-gated calcium channels leading to additive CNS/respiratory depressant effects; no significant pharmacokinetic interaction (both renally eliminated unchanged).
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