Common side effects (likely to affect greater than 1 in every 100 patients) • agitation, irritability, confusion, depression, insomnia, strange or unusual thoughts, feeling anxious or emotional. • poor muscle coordination, dizziness, poor memory, slowed thoughts, drowsiness, loss of concentration, speech abnormalities, abnormal skin sensation (pins and needles), tremor. • double vision, involuntary movement of the eyes. • kidney stones. • skin rashes, allergic reactions, fever, fatigue, flu-like symptoms. • ecchymosis (a small bruise caused by blood leaking from broken blood vessels in the skin). • loss of appetite, loss of weight, decreased blood levels of bicarbonate (a substance that prevents your blood from becoming acidic). • nausea, indigestion, stomach pains, diarrhoea (loose stools), constipation.