The antiepileptic agent gabapentin (Neurontin) possesses anxiolytic-like and antinociceptive actions that are reversed by D-serine

Psychopharmacology (Berl). 1996 Sep;127(1):1-9. doi: 10.1007/BF02805968.


This report describes the activity of the antiepileptic agent gabapentin (Neurontin) in animal models predictive of anxiolysis and analgesia. Gabapentin displayed anxiolytic-like action in the rat conflict test, the mouse light/dark box and the rat elevated X-maze with respective minimum effective doses (MEDs) of 3, 10 and 30 mg/kg. Furthermore, gabapentin also induced behavioural changes suggestive of anxiolysis in the marmoset human threat test with a MED of 30 mg/kg. In the rat formalin test of tonic nociception, gabapentin dose-dependently (30-300 mg/kg) and selectively blocked the late phase with a MED of 100 mg/kg. However, it failed to block carrageenan-induced paw oedema. The intracerebroventricular (ICV) administration of the glycine/NMDA receptor agonist D-Serine, dose-dependently (10-100 micrograms/animal) reversed the antinociceptive action of gabapentin (200 mg/kg, SC). D-Serine (30 micrograms/animal, ICV) also reversed the anxiolytic-like effects (in the light/dark box and the rat elevated X-maze) of gabapentin (30 mg/kg). In contrast, L-Serine (100 micrograms, ICV) failed to block the antinociceptive action of gabapentin. The antinociceptive action of (+)-HA-966 (25 mg/kg, SC), a partial agonist at the glycine/NMDA receptor, was reversed by D-Serine (100 micrograms/animal, ICV). However, D-Serine (100 micrograms/animal, ICV) failed to affect the antinociceptive action of a competitive NMDA receptor antagonist CGS 19755 (3 mg/kg, SC). Gabapentin has negligible affinity for the strychnine insensitive [3H]glycine binding site. This indicates that the interaction between gabapentin and D-Serine may not involve the NMDA receptor complex. Gabapentin may represent a novel type of anxiolytic and analgesic agent.

MeSH terms

  • Acetates / antagonists & inhibitors
  • Acetates / pharmacology*
  • Amines*
  • Analgesics / antagonists & inhibitors
  • Analgesics / pharmacology*
  • Animals
  • Anti-Anxiety Agents / antagonists & inhibitors
  • Anti-Anxiety Agents / pharmacology*
  • Callithrix
  • Cyclohexanecarboxylic Acids*
  • Gabapentin
  • Male
  • Mice
  • Pain Measurement
  • Rats
  • Rats, Wistar
  • Serine / pharmacology*
  • gamma-Aminobutyric Acid*


  • Acetates
  • Amines
  • Analgesics
  • Anti-Anxiety Agents
  • Cyclohexanecarboxylic Acids
  • Serine
  • gamma-Aminobutyric Acid
  • Gabapentin