Substance guides

How long does gabapentin stay in your system?

Published January 17, 2026 · 7 min read · Updated April 2026

Reviewed for accuracy by licensed clinical professionals.

Gabapentin (Neurontin) has a half-life of 5-7 hours and is eliminated primarily through the kidneys unchanged, meaning liver function has minimal effect on clearance.

Detection

Urine: 2-4 days. Gabapentin is NOT included on standard drug panels. Specialized gabapentin testing is available and increasingly used in treatment and monitoring programs. Blood: 12-24 hours. Hair and saliva testing for gabapentin is not standardized.

Growing testing interest

Several states have reclassified gabapentin as a controlled substance due to abuse potential. Treatment programs and pain management clinics are increasingly testing for gabapentin, particularly when monitoring for polysubstance use.

Clearance factors

Kidney function is the primary determinant since gabapentin is excreted unchanged by the kidneys. Impaired kidney function significantly extends detection. Dose and duration of use matter less than for liver-metabolized drugs.

Authoritative sources

This article references guidelines from: NIDA · SAMHSA · CDC

Frequently asked questions

Does gabapentin show up on a drug test?

Not on standard panels. Specialized testing exists and is increasingly used by treatment programs and pain management clinics.

How long does gabapentin stay in urine?

2-4 days with specialized testing.

Is gabapentin a controlled substance?

Not federally, but several states have classified gabapentin as a Schedule V controlled substance due to abuse potential.

Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.