Dofetilide can cause your heart to beat irregularly. You will need to be in a hospital or another place where you can be monitored closely by your doctor for at least 3 days when you are started or restarted on dofetilide. It is important to read the patient information provided to you every time you begin therapy with dofetilide.
Dofetilide is used to treat an irregular heartbeat (including atrial fibrillation or atrial flutter). It is in a class of medications called antiarrhythmics. It improves your heart rhythm by relaxing an overactive heart.
Dofetilide comes as a capsule to take by mouth. It is usually taken twice a day, but may be taken once a day in people with certain conditions. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take dofetilide exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Dofetilide controls abnormal heart rhythms but does not cure them. Continue to take dofetilide even if you feel well. Do not stop taking dofetilide without talking to your doctor.
This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.
Talk to your doctor about eating grapefruit or drinking grapefruit juice while taking dofetilide.
Take the missed dose as soon as you remember it. However, if it is almost time for your next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.
shortness of breath
difficulty falling asleep or staying asleep
fast, pounding, or irregular heartbeat
dizziness or fainting
loss of appetite
increased thirst (drinking more than normal)
If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online [at http://www.fda.gov/Safety/MedWatch] or by phone [1-800-332-1088].
Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any medication that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your medication.
In case of overdose, call your local poison control center at 1-800-222-1222. If the victim has collapsed or is not breathing, call local emergency services at 911.
Keep all appointments with your doctor and the laboratory. Your heart rhythm should be checked regularly to determine your response to dofetilide. Your doctor will also want to follow your kidney function and blood level of potassium closely while you are taking dofetilide.
Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.
It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.
Last Revised - 04/15/2014
AHFS® Consumer Medication Information. © Copyright, 2015. The American Society of Health-System Pharmacists, Inc., 7272 Wisconsin Avenue, Bethesda, Maryland. All Rights Reserved. Duplication for commercial use must be authorized by ASHP.