Anorexia, nausea, vomiting, diarrhoea, wt loss, flatulence, occasional metallic taste; weakness; hypoglycaemia; rash, malabsorption of vit B12. Chest discomfort, flushing, palpitation, chills, headache, lightheadedness, indigestion, abdominal discomfort.
Potentially Fatal: Lactic acidosis in presence of renal failure and alcoholism. Patients may experience a metallic taste and there may be weight loss, which in some diabetics could be an advantage.