NHS medicines information on dosage for gabapentin, how to take it and what to do if you miss a dose or take too much. The typical starting dosage of gabapentin for seizures is 300 mg by mouth three times a day, with or without food. Your prescriber may adjust your gabapentin dosage to up to 600 mg 3 times a day (1,800 mg per day). Dose: the starting dose range is 10 to 15 mg/kg/day, given in 3 divided doses. The recommended dose in patients 3 to 4 years of age is 40 mg/kg/day, and in patients 5 to 11 years of age is 25 to 35 mg/kg/day, given in 3 divided doses. Gabapentin starting doses typically range from 300 to 900mg daily, divided into 2 to 3 doses. The maximum daily dose is 3,600mg for most conditions, with careful monitoring required. Dose titration should occur gradually over 3 to 14 days to minimize side effects. Clinical reference on gabapentin dosage protocols: 300mg, 600mg, and 800mg tablets. Evidence-based titration schedules, renal adjustment tables, and pharmacokinetic analysis from NNPRC researchers. How to Calculate Gabapentin Dosage This calculator determines a safe starting dose of gabapentin (Neurontin) based on indication and age, using these guidelines: Detailed Gabapentin dosage information for adults and children. Includes dosages for Restless Legs Syndrome, Epilepsy and Postherpetic Neuralgia; plus renal, liver and dialysis adjustments. Medscape - Seizure dosing for Neurontin, Gralise (gabapentin), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost. Gabapentin bioavailability is not dose proportional; i.e., as dose is increased, bioavailability decreases. Bioavailability of gabapentin is approximately 60%, 47%, 34%, 33%, and 27%. The starting dose is 10 to 15 milligrams (mg) per kilogram (kg) of body weight per day and divided in 3 doses. Your doctor may adjust your dose as needed and tolerated.