Neurontin (Gabapentin)

Neurontin (gabapentin) is indicated for several neurological conditions that involve abnormal nerve signaling.

• Partial seizures: reduces seizure frequency and severity in patients with focal epilepsy.
• Postherpetic neuralgia: alleviates chronic pain following shingles infection.
• Neuropathic pain: provides relief from pain caused by nerve damage such as diabetic neuropathy.
• Restless legs syndrome: diminishes uncomfortable sensations and urges to move the legs, improving sleep quality.

• Gabapentin binds selectively to the α2δ subunit of voltage‑gated calcium channels in the central nervous system. This binding decreases calcium influx into presynaptic neurons, which in turn reduces the release of excitatory neurotransmitters such as glutamate, norepinephrine and substance P, dampening neuronal hyperexcitability associated with seizures and neuropathic pain.

Adverse reactions may vary in frequency and severity.

Common Side Effects

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

Serious or Rare Side Effects

• Stevens‑Johnson syndrome or toxic epidermal necrolysis: severe skin reactions requiring immediate medical attention.
• Suicidal thoughts or behavior: emergence of depressive symptoms or suicidal ideation.
• Anaphylaxis: rare, potentially life‑threatening allergic response.
• Severe respiratory depression: especially when combined with other CNS depressants.
• Acute renal failure: rare cases linked to rapid dose escalation.

Before initiating therapy, clinicians should consider several safety aspects.

• Renal function assessment: adjust dose in patients with impaired kidney function.
• Mood monitoring: watch for depression, anxiety or suicidal thoughts.
• Discontinuation strategy: taper gradually to avoid withdrawal seizures.
• Elderly patients: start at low dose and increase slowly due to increased sensitivity.
• Concomitant CNS depressants: use caution when combined with alcohol, opioids or benzodiazepines.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Gabapentin may interact with other medicines, altering efficacy or safety.

Major Interactions (Avoid)

• Antacids containing aluminum or magnesium: reduce gabapentin absorption; separate dosing by at least 2 hours.
• Opioids (e.g., morphine, oxycodone): increase risk of respiratory depression and profound sedation.
• CNS depressants (e.g., benzodiazepines, barbiturates): may cause excessive drowsiness or dizziness.

Moderate Interactions (Monitor Closely)

• NSAIDs (e.g., ibuprofen, naproxen): combined use may heighten risk of renal impairment.
• ACE inhibitors or ARBs: monitor kidney function and electrolytes.
• Diuretics: may potentiate renal effects, requiring dose adjustment.