Which statement about gabapentin is true?

Which statement about gabapentin is true?

• A. Gabapentin is a GABA receptor agonist.
• B. Gabapentin is primarily used for acute postoperative analgesia.
• C. Gabapentin has a well-defined mechanism identical to GABA.
• D. Gabapentin is used for chronic neuropathic pain and may reduce postoperative opioid requirements.

Answer: (D)

Gabapentin works through a mechanism different from direct GABA receptor activation, which explains its clinical use and perioperative effects. It does not bind GABA receptors; instead, it binds the alpha-2-delta subunit of voltage-gated calcium channels in the central nervous system. This reduces calcium influx at nerve terminals, leading to decreased release of excitatory neurotransmitters and dampened neuronal excitability, particularly in pathways involved in neuropathic pain. This mechanism makes gabapentin effective for chronic neuropathic pain conditions such as postherpetic neuralgia and diabetic neuropathy. It is not primarily used for acute postoperative analgesia by itself, but in the perioperative setting, it can be added as part of multimodal analgesia to lower opioid requirements and improve pain control.

Gabapentin works through a mechanism different from direct GABA receptor activation, which explains its clinical use and perioperative effects. It does not bind GABA receptors; instead, it binds the alpha-2-delta subunit of voltage-gated calcium channels in the central nervous system. This reduces calcium influx at nerve terminals, leading to decreased release of excitatory neurotransmitters and dampened neuronal excitability, particularly in pathways involved in neuropathic pain.

This mechanism makes gabapentin effective for chronic neuropathic pain conditions such as postherpetic neuralgia and diabetic neuropathy. It is not primarily used for acute postoperative analgesia by itself, but in the perioperative setting, it can be added as part of multimodal analgesia to lower opioid requirements and improve pain control.