Neurontin (Gabapentin)

Neurontin (gabapentin) acts on the nervous system to alleviate seizure activity and neuropathic pain.

• Partial seizures: used as adjunctive therapy to reduce seizure frequency in patients with focal onset seizures.
• Postherpetic neuralgia: helps relieve persistent nerve pain following shingles.
• Neuropathic pain: alleviates chronic pain associated with diabetic neuropathy and other nerve‑damage conditions.
• Restless legs syndrome: reduces uncomfortable sensations and urges to move the legs, improving sleep quality.

• Gabapentin binds selectively to the α2δ subunit of voltage‑gated calcium channels in central nervous system neurons. This binding reduces calcium influx during depolarization, decreasing the release of excitatory neurotransmitters such as glutamate, norepinephrine and substance P, which contributes to its anticonvulsant and analgesic effects.

Neurontin may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Dizziness: sensation of light‑headedness or unsteadiness.
• Somnolence: increased sleepiness or fatigue.
• Peripheral edema: swelling of the lower extremities.
• Ataxia: impaired coordination and balance.
• Weight gain: gradual increase in body weight.

Serious or Rare Side Effects

• Severe skin reactions: such as Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Suicidal thoughts or behavior: new or worsening depression, anxiety or hostility.
• Respiratory depression: especially when combined with other depressants.
• Angioedema: rapid swelling of face, lips or throat.
• Blood dyscrasias: rare cases of anemia or leukopenia.

Before initiating Neurontin, consider the following safety measures.

• Renal impairment: dose adjustment may be required because the drug is excreted unchanged by the kidneys.
• Pregnancy: safety data are limited; use only if the potential benefit justifies the potential risk.
• Elderly patients: increased susceptibility to CNS effects such as dizziness and sedation.
• Concomitant CNS depressants: may enhance sedation and respiratory depression.
• Suicidality monitoring: observe for mood changes, depression or suicidal ideation.
• Store at ambient temperature: keep in the original container, protect from moisture and excessive heat.

Gabapentin can interact with several medicines, affecting its efficacy or safety.

Major Interactions (Avoid)

• Antacids containing aluminum or magnesium: reduce gabapentin absorption, decreasing effectiveness.
• Opioids (e.g., morphine, oxycodone): combined use may increase risk of respiratory depression and profound sedation.
• CNS depressants (e.g., benzodiazepines, barbiturates): may cause excessive drowsiness or loss of coordination.

Moderate Interactions (Monitor Closely)

• NSAIDs (e.g., ibuprofen, naproxen): concurrent use may heighten the risk of renal impairment.
• Diuretics (e.g., furosemide): can exacerbate peripheral edema.
• ACE inhibitors or ARBs: monitor renal function as both drug classes are renally cleared.
• Alcohol: may intensify dizziness and somnolence.