The most common side effects of gabapentin include drowsiness, dizziness, and fatigue. More serious, though rare, side effects can involve severe breathing problems, serious allergic reactions, and mood changes, including suicidal thoughts. Common Side EffectsMost people who take gabapentin do not experience serious issues, and common side effects are often mild and may lessen over time as your body adjusts to the medication. Drowsiness, sleepiness, or tirednessDizziness or lightheadednessProblems with coordination and balance; unsteadinessSwelling in your hands, feet, or legsNausea and vomitingHeadacheBlurred or double vision, or unusual eye movementsWeight gainDry mouth, constipation, or diarrheaSore throat or flu-like symptoms Serious Side Effects (Seek Immediate Medical Attention)Call your doctor right away or seek emergency medical help if you experience any of the following symptoms: Allergic reactions (e.g., skin rash, hives, difficulty breathing or swallowing, swelling of the face, lips, tongue, or throat).Signs of DRESS syndrome (a severe drug reaction affecting multiple organs) such as fever, rash, and swollen lymph nodes, especially if they do not go away.Severe breathing problems, especially if you are older or using other sedating medications like opioids (symptoms include slow, shallow breathing; bluish-tinged skin, lips, or fingernails; or extreme sleepiness).New or worsening mental health changes, including thoughts of suicide or self-harm, depression, anxiety, agitation, aggression, or unusual changes in behavior or mood. If you or someone you know is having suicidal thoughts, call or text the 988 Suicide & Crisis Lifeline.Unusual muscle pain or weakness, especially if you have kidney problems and are on dialysis. Important ConsiderationsDo not stop taking gabapentin suddenly without talking to your healthcare provider, as this can lead to withdrawal symptoms or an increased risk of seizures.Avoid driving or operating machinery until you know how the medication affects you, as it can cause significant dizziness and drowsiness.Do not drink alcohol while on gabapentin, as the combination can increase sedative effects and the risk of serious problems.Inform your doctor about any existing kidney or lung problems, as these can affect how your body processes gabapentin and increase certain risks. Beloud