Vandetanib may cause a condition that affects the heart rhythm (QT prolongation). QT prolongation can rarely cause serious (rarely fatal) fast/irregular heartbeat and other symptoms (such as severe dizziness, fainting). Get medical help right away if you have any of these symptoms.
The risk of QT prolongation may be increased if you have certain medical conditions or are taking other drugs that may affect the heart rhythm (see also Drug Interactions). Do not use vandetanib if you have a certain heart problem (long QT syndrome). Before using vandetanib, tell your doctor or pharmacist of all the drugs you take and if you have any of the following conditions: certain heart problems (heart failure, slow heartbeat, QT prolongation/long QT syndrome), family history of certain heart problems (QT prolongation/long QT syndrome, sudden cardiac death).
Vandetanib should not be used in people with low levels of calcium, potassium, or magnesium in the blood. Low levels of these minerals may also increase your risk of QT prolongation. This risk may increase if you use certain drugs (such as diuretics/"water pills") or if you have conditions such as severe sweating, diarrhea, or vomiting.
To lower your risk, your doctor will check your mineral levels with a blood test and your heart with a test (EKG) before and periodically during treatment. Low mineral levels should be corrected before you start treatment. If you develop QT prolongation, your doctor may stop treatment for a while and restart it at a lower dose, and check your EKG again.
Since vandetanib stays in your body for a long time, it may take a while for side effects such as QT prolongation to go away after you stop taking it. Discuss the risks and benefits of treatment with your doctor.
This medication is only available through a restricted program from certified prescribers and pharmacies called the Vandetanib REMS Program. These requirements apply in the United States. If you live in Canada or any other country, consult your doctor and pharmacist for your country's regulations.
How to use Caprelsa
Take this medication by mouth with or without food as directed by your doctor, usually once daily. Swallow this medication whole. If you cannot swallow the tablets whole, place your dose in a glass of non-carbonated water (2 ounces or 60 milliliters) and stir for about 10 minutes until the tablet has broken apart. Note that the tablet will not completely dissolve. Do not use other liquids. Swallow the mixture right away. Rinse the glass with 4 ounces (120 milliliters) of non-carbonated water, stir to mix, and then swallow.
Do not break or crush the tablets. Do not touch the dust or powder from this medication. Since this drug can be absorbed through the skin and lungs and may harm an unborn baby, women who are pregnant or who may become pregnant should not handle this medication or breathe the dust from the tablets. If contact occurs, wash the area thoroughly.
The dosage is based on your medical condition and response to treatment.
Take this medication regularly to get the most benefit from it. To help you remember, take it at the same time each day.
Tell your doctor if your condition worsens.
You Might Also Like
Are you currently using Caprelsa?
This survey is being conducted by the WebMD marketing sciences department.
Free RX Coupon
Save up to 80% on your prescriptions.
Save up to 80% on your prescription with WebMDRx
CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.