Caprelsa contains the active substance vandetanib and is used to treat medullary thyroid cancer , when the tumor can not be surgically removed or in other parts of the body metastases ( branch ) has formed .
Caprelsa exerts its effect by slowing the growth of new blood vessels in tumors ( cancers ) . Thereby, the tumor is cut off from the supply with nutrients and oxygen. Caprelsa may also act directly on cancer cells or slow their growth .
Caprelsa may only be used on prescription and under constant supervision of a doctor or health care professional .