Common Side Effects
Headache
Nervousness
Drowsiness
Dizziness
Heartburn
Constipation
Diarrhea
Stomach pain
Weight gain
Increased appetite
Increased salivation
Pain, especially in the arms, legs, or joints
Serious Side Effects
Seizures
Slow, fast, or irregular heartbeat
Chest pain
Changes in vision
Unusual movements of your body or face that you cannot control
High fever
Muscle stiffness
Confusion
Sweating
Rash
Hives
Itching
Swelling of the eyes, face, mouth, lips, tongue, throat, hands, feet, ankles, or lower legs
Difficulty breathing or swallowing
Tightening of the neck muscles
Tightness in the throat