Manufacturer advises reduce dose to 150‒300 mg daily in 3 divided doses if creatinine clearance is less than 15 mL/minute (150 mg daily dose to be given as 300 mg in 3 divided doses on alternate days)—further dose reductions may be required in proportion to creatinine clearance, consult product literature. The half-life of gabapentin immediate-release formulation is 5–7 hours in patients with normal renal function and is prolonged up to 52 hours in patients with CrCl<30 mL/min. 26 The half-life of pregabalin is 16.7 hours in patients with CrCl 30–59 mL/min, 25 hours in patients with CrCl 15–29 mL/min, and 48.7 hours in patients with CrCl<15 Gabapentin dosing guidelines for adult with renal impairment are summarized in Table 3. Dosing guidelines for gabapentin immediate-release are also applicable for adolescents 12 years of age and older with renal impairment. Gabapentin is not appreciably metabolized in humans. Gabapentin elimination half-life is 5 to 7 hours and is unaltered by dose or following multiple dosing. Gabapentin elimination rate constant, plasma clearance, and renal clearance are directly proportional to creatinine clearance (see Special Populations: Patients With Renal Insufficiency Dosage Forms: capsule, tablet, oral solution 250mg/5mL; Common Trade Names: Neurontin, Gralise; Adult Dosing Partial Seizures. Adjunctive therapy for partial seizures with or without secondary generalization; Initial: 300mg PO q8hr; May increase up to 600mg PO q8hr; Post herpetic neuralgia. Day 1: 300mg PO qDay; Day 2: 300mg PO q12hr; Day 3 Pharmacology. Gabapentin and pregabalin are commonly used first-line agents for diabetic peripheral neuropathy and other common neuropathies. Pharmacologically, both agents inhibit alpha-2-delta (α2δ) subunit of N-type voltage-gated calcium channels, a key receptor involved in regulating the excitability of neurons. 3 Peripheral nerve injury results in the upregulation of α2δ-1 receptors Because gabapentin is not metabolized, studies have not been conducted in patients with hepatic impairment. Renal Impairment. Dosage adjustment of GRALISE is necessary in patients with impaired renal function. GRALISE should not be administered in patients with creatinine clearance <30 mL/min or in patients undergoing hemodialysis. Find medical information for gabapentin on epocrates online, including its dosing, contraindications, drug interactions, and pill pictures. CrCl 30-50: give 75% Kidney disease alters the pharmacokinetic disposition of many medications, requiring dosage adjustment to maintain therapeutic serum concentrations. The Cockcroft-Gault (CG) equation is used for pharmacokinetic studies and drug dosage adjustments, but the Modification of Diet in Renal Disease (MDRD) Study equation is more accurate and more often reported by clinical laboratories than the CG Detailed Gabapentin dosage information for adults and children. Includes dosages for Restless Legs Syndrome, Epilepsy and Postherpetic Neuralgia; plus renal, liver and dialysis adjustments. Moderate Kidney Problems (CrCl 30-59 mL/min): Dose Adjustment: 400-1400 mg/day BID; How Often to Take: Twice a Day; Notes: Your doctor will decide the best dose for you. Severe Kidney Problems (CrCl <30 mL/min): Dose Adjustment: 200 - 700 mg/day QD. How Often to Take: Once a Day; Notes: Careful monitoring is needed. End-Stage Renal Disease The half-life of gabapentin immediate-release formulation is 5–7 hours in patients with normal renal function and is prolonged up to 52 hours in patients with CrCl<30 mL/min. Citation 26 The half-life of pregabalin is 16.7 hours in patients with CrCl 30–59 mL/min, 25 hours in patients with CrCl 15–29 mL/min, and 48.7 hours in patients The recommended maintenance dose of NEURONTIN in patients 5 to 11 years of age is 25 mg/kg/day to 35 mg/kg/day, given in three divided doses. NEURONTIN may be administered as Prescription rates for off-label conditions have overtaken that for on-label use. Similarly, the use of gabapentinoids in the perioperative period is now embedded in clinical practice despite conflicting evidence. This article summarises the risks associated with this increasing use. When creatinine clearance is below 30 mL/minute, the half-lives of both gabapentin and pregabalin are prolonged. 8 For people with CKD, starting gabapentin at 300 mg or more daily, or pregabalin Mean half-life increased from 6.5 h (CrCl >60 mL/min) to 52 h (CrCL <30 mL/min) Gabapentin can be removed from plasma by hemodialysis Bioavailability is not proportional to dose (i.e. bioavailability of gabapentin ≅ 60% (900mg), 47% (1200mg), 34% (2400mg), 33% (2600mg), and 27% (4800mg) per day, given in 3 divided doses. TID = Three times a day; BID = Two times a day; QD = Single daily dose. a For patients with creatinine clearance <15 mL/min, reduce daily dose in proportion to creatinine clearance (e.g., patients with a creatinine clearance of 7.5 mL/min should receive one-half the daily dose that patients with a creatinine clearance of 15 mL/min receive). Usual initial gabapentin dose: 300mg q8h. Usual maintenance dose: 300-600mg q8h. Maximum dosage/day: 3600 mg. [15-29]: Dosage range: 200-700mg/day. [<15]: 100-300 mg/day. Use lower end of this range for CRCL <7.5 ml/min. TABLE 1. Gabapentin Dosage Based on Renal Function. TID = Three times a day; BID = Two times a day; QD = Single daily dose. a. Hemodialysis (CrCl ; 15 mL/min): Administer supplemental dose (range 125-350 mg) posthemodialysis, after each 4 hr dialysis interval; further dose reduction should be in proportion to CrCl (eg, Per Lexicomp, Gabapentin’s recommended dose in patients with renal impairment is as follows: CrCl >15 to 29 mL/minute: 200 to 700 mg once daily. CrCl 15 mL/minute: 100 to 300 mg once daily.
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