The following side effects are associated with Neurontin capsule: Common side effects of Neurontin capsule: Involuntary Eye MovementSevere UncoordinatedSevere DizzyLess Severe DrowsinessLess Severe Fluid Retention In The Legs, Feet, Arms Or HandsLess Severe Inducing Of A Relaxed Easy StateLess Severe Low EnergyLess Severe Infrequent side effects of Neurontin capsule: Altered Mental StatusSevere DepressionSevere Feeling Anger Toward SomethingSevere Loss Of MemorySevere Mood ChangesSevere Trouble BreathingSevere BackacheLess Severe Blurred VisionLess Severe ConstipationLess Severe CoughLess Severe DiarrheaLess Severe Difficulty SpeakingLess Severe Double VisionLess Severe Dry MouthLess Severe Feel Like Throwing UpLess Severe Feeling WeakLess Severe Hyperactive BehaviorLess Severe Infection Caused By A VirusLess Severe Involuntary QuiveringLess Severe Lazy EyeLess Severe Middle Ear InfectionLess Severe Not Feeling WellLess Severe Throat DrynessLess Severe Throat IrritationLess Severe Throwing UpLess Severe Weight GainLess Severe Rare side effects of Neurontin capsule: Abnormal Liver Function TestsSevere ConfusedSevere Decreased Lung FunctionSevere DRESS SyndromeSevere Easily Angered Or AnnoyedSevere Erythema MultiformeSevere Giant HivesSevere Having Thoughts Of SuicideSevere Hypersensitivity Drug ReactionSevere Increased Eosinophils In The BloodSevere Life Threatening Allergic ReactionSevere Low Amount Of Sodium In The BloodSevere Multiple Organ FailureSevere RhabdomyolysisSevere Stevens-Johnson SyndromeSevere Swollen Lymph NodesSevere Yellowing Of Skin Or Eyes From Liver ProblemsSevere Altered Interest In Having Sexual IntercourseLess Severe Cannot Focus ThoughtsLess Severe Chronic Trouble SleepingLess Severe Enlarged BreastsLess Severe Excessive SweatingLess Severe Feeling AgitatedLess Severe Feeling AnxiousLess Severe FeverLess Severe Head PainLess Severe High Blood SugarLess Severe Inability To Have An ErectionLess Severe Increased Creatine Kinase LevelLess Severe IndigestionLess Severe Inflammation Of The NoseLess Severe Loss Of AppetiteLess Severe PainLess Severe Pink EyeLess Severe Problem BehaviorLess Severe Rash