Common: affects 1 to 10 users in 100 • Problems in keeping your balance, difficulties in coordinating your movements, troubles with your memory, sleepiness, shaking (tremor), trouble thinking or finding words, rapid and uncontrollable movements of the eyes (nystagmus) • Blurred vision • A feeling of "spinning" (vertigo) • Vomiting, constipation, excessive gas in the stomach or bowel • Itching • Fall • Tiredness, difficulties in walking, unusual tiredness and weakness (asthenia) • Depression