.Gamma.-Aminobutyric Acid: Side Effects, Uses & Monitoring
INDICATIONS AND USAGE Postherpetic Neuralgia Gabapentin Capsules is indicated for the management of postherpetic neuralgia in adults.
- Data source
- FDA labeling via NIH DailyMed (label f501c511…)
- Label version
- current
- Last reviewed
- 2026
Reported adverse reactions
Reactions listed in current FDA labeling, with the highest frequency reported across summarized placebo-controlled trials.
| Adverse reaction (as reported in labeling) | Reported frequency* |
|---|---|
| Dizziness | 28% |
| Somnolence | 21.4% |
| Fatigue | 11% |
| Viral infection | 10.9% |
| Fever | 10.1% |
| Nausea and / or vomiting | 8.4% |
| Peripheral edema | 8.3% |
| Nystagmus | 8.3% |
| Hostility | 7.6% |
| Tremor | 6.8% |
| Asthenia | 5.7% |
| Diarrhea | 5.7% |
| Infection | 5.1% |
| Dry mouth | 4.8% |
| Amblyopiab | 4.2% |
| Emotional lability | 4.2% |
| Rhinitis | 4.1% |
| Constipation | 3.9% |
| Nausea | 3.9% |
| Bronchitis | 3.4% |
*Highest percentage reported for the active moiety across placebo-controlled trial tables in current FDA labeling. Values reflect trial reporting, not your individual risk.
Labeled uses (from FDA prescribing information)
INDICATIONS AND USAGE Postherpetic Neuralgia Gabapentin Capsules is indicated for the management of postherpetic neuralgia in adults. Epilepsy Gabapentin Capsules is indicated as adjunctive therapy in the treatment of partial seizures with and without secondary generalization in patients over 12 years of age with epilepsy. Gabapentin Capsules is also indicated as adjunctive therapy in the treatment of partial seizures in pediatric patients age 3 – 12 years.
Conditions associated with .Gamma.-Aminobutyric Acid in labeling
Frequently Asked Questions
What is .Gamma.-Aminobutyric Acid used for?
FDA labeling lists the approved uses shown above under "Labeled uses." This summary is informational; only a qualified prescriber can determine whether a medication is appropriate for you.
What are the most commonly reported side effects of .Gamma.-Aminobutyric Acid?
The table above shows adverse reactions and the highest frequencies reported in placebo-controlled trials summarized in current FDA labeling for .Gamma.-Aminobutyric Acid. Individual risk varies.
Does .Gamma.-Aminobutyric Acid require lab monitoring?
Monitoring needs vary. Ask your healthcare provider whether any lab tests apply while taking .Gamma.-Aminobutyric Acid.
Where does this information come from?
All clinical facts on this page were extracted from the current FDA-registered product labeling for this ingredient, published by manufacturers through NIH DailyMed. See the source link below.
Medical disclaimer: Educational content extracted from public FDA labeling. Not medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.