Not a substitute for insulin in insulin-requiring patients & not to be used in patients w/ type 1 diabetes. Hepatic impairment, including pre-treatment ALT or AST >3x ULN. Not to be used during pregnancy. Metformin: Lactic acidosis. Temporarily discontinue in case of dehydration (severe diarrhoea or vomiting, fever or reduced fluid intake). Initiate medicinal products that can acutely impair renal function (eg, antihypertensives, diuretics & NSAIDs) w/ caution in metformin-treated patients. Risk factors for lactic acidosis eg, excessive alcohol intake, hepatic insufficiency, inadequately controlled diabetes, ketosis, prolonged fasting & any conditions associated w/ hypoxia, as well as concomitant use of medicinal products that may cause lactic acidosis. Discontinue in case of suspected symptoms of lactic acidosis. May lead to contrast-induced nephropathy w/ intravascular administration of iodinated contrast agents. Discontinue prior to or at the time of imaging procedure & do not restart until at least 48 hr after, provided that renal function has been re-evaluated & found to be stable. Assess GFR before treatment initiation & regularly thereafter; temporarily discontinue in the presence of conditions that alter renal function. Concomitant medicinal products that may affect renal function, result in significant haemodynamic change, or inhibit renal transport & increase systemic exposure. Discontinue at time of surgery under general, spinal or epidural anaesth. Restart therapy no earlier than 48 hr following surgery or resumption of oral nutrition & provided that renal function has been re-evaluated & found to be stable. Vildagliptin: Perform LFTs prior to initiation of treatment in order to know patient's baseline value. Monitor liver function during treatment at 3-mth intervals during the 1st yr & periodically thereafter. Monitor patients who develop increased transaminase levels w/ 2nd liver function evaluation to confirm finding & be followed thereafter w/ frequent LFTs until abnormalities return to normal. W/draw therapy if increase in AST or ALT of 3x ULN or greater persist. Discontinue in patients who develop jaundice or other signs suggestive of liver dysfunction; if pancreatitis is suspected. Skin lesions, including blistering & ulceration; monitor skin disorders in diabetic patient. Do not restart treatment if acute pancreatitis is confirmed. Patients w/ history of acute pancreatitis. Risk of hypoglycaemia in combination w/ sulphonylurea.