Common Side Effects

These side effects are experienced by more than 1 in 10 people taking gabapentin:

Most Common (>10% of patients)

Drowsiness & Fatigue

Feeling tired, sleepy, or lacking energy. Usually improves with continued use.

Dizziness

Feeling unsteady or lightheaded, especially when standing up quickly.

Coordination Problems

Difficulty with balance, unsteadiness, or clumsiness.

Swelling

Swelling of hands, feet, or ankles (peripheral edema).

Less Common (1-10% of patients)

  • Blurred or double vision
  • Nausea and vomiting
  • Weight gain
  • Tremor or shaking
  • Memory problems
  • Difficulty speaking
  • Constipation
  • Dry mouth
  • Headache
  • Mood changes

Serious Side Effects

Contact your healthcare provider immediately if you experience any of these:

Suicidal Thoughts

Thoughts of self-harm or suicide, especially in the first few months of treatment.

Allergic Reactions

Rash, itching, swelling, severe dizziness, or trouble breathing.

Severe Mood Changes

Unusual changes in mood, behavior, or mental state.

Important Warnings

Withdrawal Symptoms

Do not stop taking gabapentin suddenly. Stopping abruptly may cause withdrawal symptoms including:

  • Anxiety and agitation
  • Insomnia
  • Nausea and flu-like symptoms
  • Seizures (in rare cases)

Always consult your healthcare provider before stopping or reducing your dose.

Drug Interactions

Gabapentin can interact with other medications, including:

  • Opioid pain medications
  • Sedatives and sleeping pills
  • Antacids (may reduce absorption)
  • Alcohol (increases drowsiness)