- Gabapentin's most common side effects in adult patients include dizziness, fatigue, weight gain, drowsiness, and peripheral edema (swelling of extremities);these mainly occur at higher doses in the elderly.
- Gabapentin has been associated with an increased risk of suicidal acts or violent deaths.In 2009 the U.S. Food and Drug Administration issued a warning of an increased risk of depression and suicidal thoughts and behaviors in patients taking gabapentin, along with other anticonvulsant drugs modifying the packaging insert to reflect this. In July 2009 the manufacturer of gabapentin (Pfizer) went to trial regarding the association between gabapentin and the increased risk of suicide.
- Persons who accidentally or intentionally ingested overdoses have manifested drowsiness, blurred vision, slurred speech and somnolence or coma.
