Common side effects: affect 1 to 10 users in 100 • Changes in the levels of some blood cells and circulating fats. • Increases in the level of sugars in the blood and urine. • Feeling more hungry. • Dizziness. • Restlessness. • Tremor. • Muscle stiffness or spasm (including eye movements). • Problems with speech. • Unusual movement (especially of the face or tongue).