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In these studies, the most common Lamictal side effects included:   Dizziness -- in up to 54 percent of people Double vision -- up to 49 percent Headaches -- up to 29 percent Coordination problems -- up to 28 percent Blurred vision -- up to 25 percent Nausea -- up to 25 percent Vomiting -- up to 20 percent.   Other common side effects, occurring in 5 to 20 percent of people, included:   Drowsiness Irritated or runny nose Sore throat Cough Abdominal pain (stomach pain) Insomnia (see Lamictal and Insomnia) Shakiness (tremor) Weakness Back pain Fatigue Flu-like symptoms (such as body aches or chills) Indigestion or heartburn Painful menstrual cramps Bronchitis Diarrhea Fever Dry mouth (see Lamictal and Dry Mouth) Constipation Painful menstrual cramps Chest pain Weight loss (see Lamictal and Weight Loss). Worsening of seizures   Depression, anxiety, or suicidal thoughts   Any unusual bruising or bleeding   Signs of liver damage, such as yellow eyes or skin (jaundice)   Severe muscle pain   Frequent infections   Signs of a dangerous allergic reaction, including: o Hives or any rash o Fever o Swollen lymph nodes (swollen "glands") o Painful sores in or around the mouth or eyes o Swelling of the lips or tongue Suicidal thinking or behavior (see Seizure Medications and Suicide).   Lamictal can cause very serious skin rashes and allergic reactions. These rashes can cause large sections of the skin to die and can cause disfigurement or even loss of life (see Lamictal Rash.)   Rare Lamictal Side Effects Less common side effects of Lamictal are also possible. These side effects occurred in less than 5 percent of people taking the drug. Because these side effects are so rare, it can be difficult to tell whether they are actually caused by Lamictal or by other factors unrelated to the medication.   Some of these less common side effects include but are not limited to:   Vaginal infection or irritation Speech problems Bladder infection (urinary tract infection or UTI) Concentration problems Joint pain Loss of appetite Neck pain Sinus infection Sensitivity to the sun Nervousness A spinning sensation (vertigo) Memory loss (amnesia) Increased sex drive Bloody nose Dry skin Sweating Migraine headaches Weight gain (see Lamictal and Weight Gain).