Gabapentin Dosing Planner
Calculate per-dose amounts, titration schedules, and renal dosing for gabapentin based on indication and creatinine clearance.
Typical effective range: 900–3600 mg/day.
Common: 3 times daily (TID). Twice daily for lower renal function.
Use Cockcroft-Gault or measured renal function.
Per-dose calculation
Per dose
600 mg
1800 mg/day divided into 3 doses.
Renal adjustment
CrCl 80 mL/min → 300 mg three times daily (start 300 mg nightly, titrate to 900–3600 mg/day)
Suggested titration
• Day 1: 300 mg at bedtime
• Day 2: 300 mg twice daily
• Day 3: 300 mg three times daily
• Increase by 300 mg/day every 2–3 days as needed (max 3600 mg/day)
How to Use This Calculator
Select indication
Different conditions have distinct titration schedules. Choose the one prescribed.
Enter desired maintenance dose
Use prescriber’s target or typical therapeutic dose (e.g., 1800 mg/day for pain).
Adjust for renal function
Override daily dose if renal function requires lower dosing frequency or amount.
Formula
Per dose (mg) = Total daily dose ÷ doses per day.
Sources: Gabapentin prescribing information, AAN neuropathic pain guidelines, renal dosing references.
Frequently Asked Questions
How fast can I titrate?
Increase no faster than every 2–3 days to limit CNS adverse effects.
Is there a loading dose?
Typically no; start low and titrate unless treating acute severe pain with specialist guidance.
What about extended-release formulations?
Horizant® and Gralise® have different dosing; use product-specific calculators.
Can I split the daily dose unevenly?
Yes—larger evening doses can reduce daytime somnolence (e.g., 300-300-600 mg). Document clearly.
What if doses are missed?
Take as soon as remembered unless close to next dose; never double dose.