What it's used for
Gabapentin is used for the management of postherpetic neuralgia in adults and as an add-on therapy for partial-onset seizures in adults and pediatric patients aged 3 years and older.
Source: U.S. FDA-approved prescribing information (openFDA).
Typical dosing
For postherpetic neuralgia, the dose starts at 300 mg on day one and can be titrated up to 1800 mg per day as needed.
Dosing shown here is the general FDA-labeled range. Your prescribing clinician determines the exact dose, form, and schedule for you — this is not a substitute for medical advice.
Common side effects
Common and serious side effects include somnolence, dizziness, allergic reactions, and respiratory depression.
Covered strengths on the Tab $0 list
Covered at $0 with an active Tab membership when filled at a participating pharmacy nationwide or through mail order. A licensed clinician must prescribe the medication.
Related medications
Other everything else medications covered at $0 with an active Tab membership.
Gabapentin dosage and administration
2 DOSAGE AND ADMlNlSTRATION Postherpetic Neuralgia (2.1) Dose can be titrated up as needed to a dose of 1800 mg/day Day 1: Single 300 mg dose Day 2: 600 mg/day (i.e., 300 mg two times a day) Day 3: 900 mg/day (i.e., 300 mg three times a day) Epilepsy with Partial Onset Seizures (2.2) Patients 12 years of age and older: starting dose is 300 mg three times daily; may be titrated up to 600 mg three times daily Patients 3 to 11 years of age: starting dose range is 10 to 15 mg/kg/day, given in three divided doses; recommended dose in patients 3 to 4 years of age is 40 mg/kg/day, given in three divided doses; the recommended dose in patients 5 to 11 years of age is 25 to 35 mg/kg/day, given in three divided doses.
Excerpt from the FDA-approved prescribing information (openFDA), retrieved 2026-09-15. Your prescribing clinician decides the exact dose, form and schedule for you — this is not medical advice.
Gabapentin side effects
The following serious adverse reactions are discussed in greater detail in other sections: Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS)/Multiorgan Hypersensitivity [see Warnings and Precautions (5.1) ] Anaphylaxis and Angioedema [see Warnings and Precautions (5.2) ] Somnolence/Sedation and Dizziness [see see Warnings and Precautions (5.4) ] Withdrawal Precipitated Seizure, Status Epilepticus [see see Warnings and Precautions (5.5) ] Suicidal Behavior and Ideation [see see Warnings and Precautions (5.6) ] Respiratory Depression [see Warnings and Precautions (5.7) ] Neuropsychiatric Adverse Reactions (Pediatric Patients 3 to 12 Years of Age) [ see Warnings and Precautions (5.8) ] Sudden and Unexplained Death in Patients with Epilepsy [see Warnings and Precautions (5.10) ] Most common adverse reactions (incidence ≥8% and at least twice that for placebo) were: Postherpetic neuralgia: Dizziness, somnolence, and peripheral edema (6.1) Epilepsy in patients >12 years of age: Somnolence, dizziness, ataxia, fatigue, and nystagmus (6.1) Epilepsy in patients 3 to 12 years of age: Viral infection, fever, nausea and/or vomiting, somnolence, and hostility (6.1) To report SUSPECTED ADVERSE REACTIONS, contact ACI HealthcareUSA, Inc.
Excerpt from the FDA-approved prescribing information (openFDA), retrieved 2026-09-15. This is not a complete list. Report side effects to your clinician, and seek care for anything severe or unexpected.
Gabapentin drug interactions
Concentrations increased by morphine; may need dose adjustment (5.4, 7.1 ) 7.1 Opioids Respiratory depression and sedation, sometimes resulting in death, have been reported following coadministration of gabapentin with opioids (e.g., morphine, hydrocodone, oxycodone, buprenorphine) [ see Warnings and Precautions (5.7) ]. Hydrocodone Coadministration of gabapentin with hydrocodone decreases hydrocodone exposure [ see Clinical Pharmacology (12.3) ]. The potential for alteration in hydrocodone exposure and effect should be considered when gabapentin is started or discontinued in a patient taking hydrocodone. Morphine When gabapentin is administered with morphine, patients should be observed for signs of CNS depression, such as somnolence, sedation and respiratory depression [see Clinical Pharmacology (12.3) ].
Excerpt from the FDA-approved prescribing information (openFDA), retrieved 2026-09-15. Tell your clinician and pharmacist about every medication, supplement and over-the-counter product you take.
Who should not take gabapentin
Gabapentin is contraindicated in patients who have demonstrated hypersensitivity to the drug or its ingredients. Known hypersensitivity to gabapentin or its ingredients (4)
Excerpt from the FDA-approved prescribing information (openFDA), retrieved 2026-09-15. Whether this medication is appropriate for you is a clinical decision made by your prescribing clinician.
Common questions
Is gabapentin covered at $0 with Tab?
Yes. Gabapentin is on Tab's covered $0 generic list — every covered strength is $0 with an active membership, at participating pharmacies nationwide or by mail order.
Do I need insurance to get gabapentin through Tab?
No. Tab is a membership, not insurance. Covered medications are $0 with an active membership whether or not you have a health plan.
What is the usual dose of gabapentin?
2 DOSAGE AND ADMlNlSTRATION Postherpetic Neuralgia (2.1) Dose can be titrated up as needed to a dose of 1800 mg/day Day 1: Single 300 mg dose Day 2: 600 mg/day (i.e., 300 mg two times a day) Day 3: 900 mg/day (i.e., 300 mg three times a day) Epilepsy with Partial Onset Seizures (2.2) Patients 12 years of age and older: starting dose is 300 mg three times daily; (FDA-approved label, retrieved 2026-09-15. Your clinician sets your dose.)
What are the side effects of gabapentin?
The following serious adverse reactions are discussed in greater detail in other sections: Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS)/Multiorgan Hypersensitivity [see Warnings and Precautions (5.1) ] Anaphylaxis and Angioedema [see Warnings and Precautions (5.2) ] Somnolence/Sedation and Dizziness [see see Warnings and Precautions (5.4) ] Withdrawal Precipitated Seizure, Status Epilepticus [see see Warnings and Precautions (5.5) ] Suicidal Behavior and Ideation [see see Warnings and Precautions (5.6) ] Respiratory Depression [see Warnings and Precautions (5.7) ] Neuropsychiatric Adverse Reactions (Pediatric Patients 3 to 12 Years of Age) [ see Warnings and Precautions (5.8) ] Sudden and Unexplained Death in Patients with Epilepsy [see Warnings and Precautions (5.10) ] Most common adverse reactions (incidence ≥8% and at least twice that for placebo) were: Postherpetic neuralgia: Dizziness, somnolence, and peripheral edema (6.1) Epilepsy in patients >12 years of age: Somnolence, dizziness, ataxia, fatigue, and nystagmus (6.1) Epilepsy in patients 3 to 12 years of age: Viral infection, fever, nausea and/or vomiting, somnolence, and hostility (6.1) To report SUSPECTED ADVERSE REACTIONS, contact ACI HealthcareUSA, Inc. (FDA-approved label, retrieved 2026-09-15.)
What interacts with gabapentin?
Concentrations increased by morphine; may need dose adjustment (5.4, 7.1 ) 7.1 Opioids Respiratory depression and sedation, sometimes resulting in death, have been reported following coadministration of gabapentin with opioids (e.g., morphine, hydrocodone, oxycodone, buprenorphine) [ see Warnings and Precautions (5.7) ]. (FDA-approved label, retrieved 2026-09-15. Tell your clinician about every medication and supplement you take.)
Gabapentin is $0 on the covered list
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