Caprelsa (generic: vandetanib) is a prescription medication used to treat a rare type of thyroid cancer in adults.  Caprelsa belongs to a group of drugs called tyrosine kinase inhibitors. It works by blocking actions of a certain protein that signals cancer cells to multiply, which slows or stops the spread of cancer cells.

This medication comes in tablet form and is taken once a day, with or without food.

Common side effects of Caprelsa include diarrhea, rash, acne, and nausea.  Caprelsa can cause blurred vision, drowsiness, and sensitivity to the sun.  Do not drive or use machinery until you know how Caprelsa will affect you.

Because Caprelsa can cause serious side effects, it is only available through a restricted distribution program called the Caprelsa REMS Program. Only prescribers and pharmacies certified through the restricted distribution program are able to prescribe and dispense Caprelsa.