Gabapentin Dosage Calculator

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Pediatric mode uses weight-based dosing (mg/kg/day) for epilepsy adjunct therapy in children aged 3-12.
Select the condition being treated. Off-label uses have less robust clinical evidence.
Body weight in kilograms. Required for pediatric dosing; also used to contextualise adult doses.
kg
Kidney function measured as creatinine clearance. Gabapentin is renally cleared, so doses are reduced for CrCl below 60 mL/min. Use 90+ for normal function.
mL/min
Patients on hemodialysis require a supplemental dose after each 4-hour session in addition to the daily dose.
Select the available formulation to calculate how many units per dose are needed.
Starting doseNormal renal function
300mg/day

Recommended first-day dose to begin titration

Maintenance range900-1800 mg/day
Maximum daily dose3,600mg/day
Dose per administration500 mg three times daily (TID)
Renal categoryNormal (CrCl >= 60)
Units per dose1.7 x 300 mg unit(s)
3,600 mg/day
  • Day 1 start
  • Min maintenance
  • Typical target
  • Absolute max
Starting dose (mg/day)300
Max daily dose (mg/day)3,600

Starting dose: 300 mg/day, target: 900-1800 mg/day.

  • Begin at 300 mg on Day 1, increase to 600 mg on Day 2, and reach 900 mg/day (divided TID) from Day 3 onward.
  • For neuropathic pain / postherpetic neuralgia, the typical maintenance range is 900-1800 mg/day. The absolute maximum is 3600 mg/day.
  • Begin with 300 mg on Day 1, titrate up to an effective dose over 1-2 weeks. For postherpetic neuralgia the FDA label titrates to 1800 mg/day and states that additional benefit beyond 1800 mg/day was not demonstrated in the clinical studies; higher doses up to 3600 mg/day are used off-label for other neuropathic pain.

Next stepThis result is for educational reference only. Confirm all doses with the prescribing clinician, who will account for comorbidities, drug interactions, and individual tolerability.

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