Please tell your doctor if you know you are suffering, or have suffered, from any of the following: − epileptic seizures − liver disease − cancer − anaemia from other causes − heart disease (such as angina) − disorders of blood circulation resulting in pins and needles or cold hands or feet or muscle cramps in the legs − blood clots/blood clotting disorders − phenylketonuria (genetic enzyme deficiency that increases excretion of a chemical (phenylketone) in urine and may cause nervous system disorders) − kidney disease.