The condition and the treatment
Hypercholesterolaemia is a medical term meaning that a person's cholesterol levels are too high. In primary heterozygous‑familial hypercholesterolaemia, high cholesterol levels are caused by a faulty gene. Whereas in primary non‑familial hypercholesterolaemia, which is more common, several genetic factors combine with a person's health risks, such as poor diet, smoking and lack of exercise, to cause high cholesterol levels.
Ezetimibe (Ezetrol) is a medicine that works by blocking the absorption of cholesterol in the gut. This helps to lower cholesterol levels in the blood.
NHS Choices may be a good place to find out more.