Alternatives to Dofetilide if You Can't Fill Your Prescription

If you've been prescribed Dofetilide (brand name Tikosyn) to manage atrial fibrillation or atrial flutter, and you can't find it at your pharmacy, you're not alone. An ongoing shortage has made this medication difficult to locate, and some patients are facing the question: what else can I take?

Important: Never switch heart rhythm medications on your own. Any change to your antiarrhythmic therapy must be made by your cardiologist or electrophysiologist, who will consider your specific heart condition, other medications, kidney function, and overall health. This article is for informational purposes to help you have an informed conversation with your doctor.

What Is Dofetilide and How Does It Work?

Dofetilide is a Class III antiarrhythmic medication that works by selectively blocking the rapid delayed rectifier potassium current (IKr) in the heart. This slows down the electrical signals that cause the heart to beat irregularly, helping to restore and maintain a normal sinus rhythm.

It's specifically approved for converting atrial fibrillation and atrial flutter to normal rhythm and for keeping the heart in normal rhythm long-term. Dofetilide is one of the few antiarrhythmics that can be safely used in patients with heart failure — a key reason why some patients are on this specific medication rather than alternatives.

Why Some Patients Need an Alternative

The ongoing Dofetilide shortage — driven by manufacturers like Accord and Sun exiting the market — has left only Novadoz (generic) and Pfizer (Tikosyn) as active suppliers. Some patients are finding it impossible to get timely refills, which can be dangerous for a heart rhythm medication.

If you and your doctor decide that staying on Dofetilide isn't feasible right now, here are the alternatives your cardiologist may consider.

Alternative 1: Amiodarone (Cordarone, Pacerone)

Amiodarone is the most effective antiarrhythmic drug available for maintaining normal sinus rhythm in atrial fibrillation. Like Dofetilide, it belongs to the Class III antiarrhythmic family, but it works on multiple ion channels rather than just one.

• Pros: Most effective at maintaining sinus rhythm. Can be used in patients with heart failure. Widely available and inexpensive as a generic.
• Cons: Significant long-term side effects including thyroid problems, lung toxicity (pulmonary fibrosis), liver damage, and skin sensitivity to sunlight. Requires regular blood work to monitor thyroid and liver function. Often considered a last resort due to side effects.
• Key difference from Dofetilide: Much broader mechanism of action with more potential organ toxicity. Does not require in-hospital initiation in most cases.

Alternative 2: Sotalol (Betapace, Betapace AF)

Sotalol is another Class III antiarrhythmic that shares some similarities with Dofetilide. However, Sotalol also has beta-blocker properties, meaning it slows the heart rate in addition to controlling rhythm.

• Pros: Well-studied for atrial fibrillation. Available as a generic. The beta-blocker effect can be helpful for patients who also need heart rate control.
• Cons: Also carries a risk of QT prolongation and torsades de pointes. Requires in-hospital initiation with monitoring, just like Dofetilide. The beta-blocker effect can cause low blood pressure, fatigue, and breathing problems in some patients. Generally avoided in severe heart failure.
• Key difference from Dofetilide: Has additional beta-blocker activity. May not be suitable for patients with heart failure or very low blood pressure — a population where Dofetilide may be preferred.

Alternative 3: Dronedarone (Multaq)

Dronedarone was developed as a safer alternative to Amiodarone. It has a similar mechanism of action but lacks the iodine component that causes many of Amiodarone's organ toxicity issues.

• Pros: Better side effect profile than Amiodarone. Does not require in-hospital initiation. Does not cause the thyroid and lung problems associated with Amiodarone.
• Cons: Less effective than Amiodarone or Dofetilide at maintaining sinus rhythm. Contraindicated in patients with heart failure (NYHA Class IV or recent decompensation) — this is a major limitation. Brand-name only (Multaq), so it can be expensive.
• Key difference from Dofetilide: Cannot be used in heart failure patients — who are one of the main populations for Dofetilide. Less effective overall but easier to start.

Alternative 4: Flecainide (Tambocor)

Flecainide is a Class IC antiarrhythmic — a different class than Dofetilide — that works by slowing electrical conduction in the heart. It's commonly used for atrial fibrillation in patients without structural heart disease.

• Pros: Does not require in-hospital initiation. Available as a generic. Well-tolerated in patients with structurally normal hearts. Can be used as a "pill-in-the-pocket" approach for occasional AFib episodes.
• Cons: Cannot be used in patients with structural heart disease, coronary artery disease, or heart failure — a serious limitation. Must be used with a rate-controlling agent (like a beta-blocker) to prevent dangerously fast rhythms.
• Key difference from Dofetilide: Different mechanism entirely. Only appropriate for patients without structural heart disease, whereas Dofetilide is specifically valued for its safety in heart failure.

How Your Doctor Will Decide

Choosing an alternative to Dofetilide isn't a simple swap. Your cardiologist will consider several factors:

• Structural heart disease or heart failure — If present, options narrow significantly. Amiodarone may be the only other choice.
• Kidney function — Sotalol and Dofetilide are both cleared by the kidneys. If kidney function is an issue, your doctor will factor this into the choice.
• Other medications — Drug interactions are a major concern with all antiarrhythmics. Your full medication list will influence which alternatives are safe.
• Whether the shortage is temporary — If Dofetilide may become available again soon, your doctor may choose a bridge strategy rather than a permanent switch.

Before Switching: Try Finding Dofetilide First

Before you and your doctor make the decision to switch medications, it's worth trying to locate Dofetilide first. Use Medfinder to check nearby pharmacies, or read our full guide on how to find Dofetilide in stock. The medication is still being manufactured — the challenge is locating available supply.

Final Thoughts

There's no perfect one-to-one replacement for Dofetilide — each alternative has its own pros, cons, and limitations. The best choice depends entirely on your individual heart condition and overall health. If you're struggling to find Dofetilide, bring this information to your next cardiology appointment and discuss which option might be right for you.

Still looking for Dofetilide? Search for availability on Medfinder before considering a switch.