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Gabapentin Facts

Depressant; Anxiolytic; Gabapentinoid; Alpha-2-delta voltage-gated calcium channel blocker

Description

Gabapentin is a synthetic depressant of the gabapentinoid class. Instead, it reduces calcium channel activity at overexcited nerve terminals, quieting pain and anxiety signals.[1]

Subjective effects include sedation, anxiety suppression, pain reduction, warmth, and enhanced sociability. The experience is a smooth, diffuse quieting — lighter and less mentally erasing than benzodiazepines, with a warm drowsiness that does not cloud thinking as heavily.

Gabapentin produces physical dependence with prolonged use;[2] stopping abruptly can trigger anxiety, insomnia, tremor, and sometimes seizures. Acute toxicity alone is very low,[3] but combining it with opioids amplifies sedation and stops breathing — this combination causes most gabapentin-linked deaths.[4]

Dose and durationby route · individual sensitivity varies

Oral(mg)
Threshold< 200 mgLight200 – 900 mgCommon900 – 1500 mgStrong1500 – 2400 mgHeavy2400+ mg

Starts in 30 – 120 minLasts 6 – 10 hoursAfter-effects 2 – 8 hours

Body and dependence

Acute toxicity
Low
Chronic toxicity
Low
Physical dependence
Moderate
Psychological dependence
Low
Withdrawal
Moderate · medical supervision
Compulsive redosing
Low

Tolerance

Builds
Moderate
Fully resets after
Not recorded
Carries over to
pregabalin

Effectslikely at a common dose

Perception
none likely · 6 possible, including Visual acuity suppression, Vestibular distortion, Visual haze / noise
Body
Dizziness; Pain suppression; Motor control impairment; Physical fatigue; Sedation; +13 possible, including Nausea, Nystagmus (eye wobbles), Trembling
Thinking
Cognitive impairment; +12 possible, including Decision impairment, Information processing suppression, Analysis suppression
Feeling
Anxiety suppression; +3 possible, including Emotional lability
Self
Disinhibition; +3 possible, including Craving
Time
none likely · 2 possible, including Temporal disorientation

Who shouldn't take it

Absolute
Concurrent opioid use
Relative
Concurrent benzodiazepine use; Concurrent alcohol use; Suicidal ideation or depression; Renal impairment; Pregnancy; Elderly; History of substance use disorder

Combinations60 recorded

Dangerous (11)
Benzodiazepines, Barbiturates; Buprenorphine, Kratom; Clonidine, Guanfacine; Opioids; SNRIs; Alpha-2 adrenergic receptor antagonist; Benzodiazepines; GHB, Baclofen; GHB, GBL; Ketamine, DXM, PCP; Synthetic cannabinoids
Caution (26)
See full page: psychedex.org/substances/gabapentin
Not graded (23)
Not listed never means safe.

Seek help immediately if

  • Extreme drowsiness — can't stay awake or be roused
  • Confusion, slurred speech, severe loss of coordination
  • Slow, shallow, or irregular breathing
  • Unconsciousness / unresponsive; limp, floppy body
  • Blue lips or fingertips
  • Vomiting while sedated (choking / aspiration risk)
  • Cold, clammy skin; weak pulse

What to do

  1. Try to wake them — shout, firm sternal rub
  2. If unresponsive or breathing is impaired, call emergency services
  3. Place them in the recovery position — critical, they can choke on vomit
  4. Monitor breathing continuously; be ready to give rescue breaths / CPR
  5. Never leave them alone to "sleep it off"
  6. Do not give other drugs, stimulants, or more depressants

Most depressant overdoses resolve with airway protection, breathing support, and monitoring. The danger is respiratory depression and choking on vomit — sharply worse when combined with opioids or alcohol. GHB/GBL overdoses often involve sudden deep unconsciousness and may self-resolve, but airway protection is essential.

988 Suicide & Crisis LifelineFireside Project: 62-FIRESIDE

Version r1 · Not medical advice

References

  1. [1]
    ^Gee NS, Brown JP, Dissanayake VU, Offord J, Thurlow R, Woodruff GN (1996) The novel anticonvulsant drug, gabapentin (Neurontin), binds to the alpha2delta subunit of a calcium channel — The Journal of Biological Chemistry PMID:8621444
  2. [2]
    ^Norton JW (2001) Gabapentin withdrawal syndrome — Clinical Neuropharmacology PMID:11479399
  3. [3]
    ^FDA / Pfizer (2017) Gabapentin LD50 and toxicity in rodents - FDA label and preclinical data Link
  4. [4]
    ^Gomes T, Juurlink DN, Antoniou T, Mamdani MM, Paterson JM, van den Brink W (2017) Gabapentin, opioids, and the risk of opioid-related death: A population-based nested case-control study — PLoS Medicine doi:10.1371/journal.pmed.1002396
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