Antiarrhythmic Drugs Part 2
Real Life Pharmacology - Pharmacology Education for Health Care Professionals
Eric Christianson, PharmD; Pharmacology Expert and Clinical Pharmacist
4.9 • 773 Ratings
🗓️ 12 March 2026
⏱️ 14 minutes
🧾️ Download transcript
Summary
In this episode, we are going to review antiarrhythmic drugs that clinicians may encounter in practice: Digoxin, Propafenone, Dofetilide, and a few others. While these drugs are commonly used in the management of atrial fibrillation and other rhythm disturbances, they each come with important pharmacology and safety considerations that pharmacists and healthcare providers need to recognize.
Digoxin is a cardiac glycoside that increases contractility while also slowing AV node conduction through enhanced vagal tone, making it useful for rate control in atrial fibrillation, particularly in patients with heart failure. However, it has a narrow therapeutic index, and toxicity can occur if renal function declines or electrolyte abnormalities develop.
Propafenone is a Class IC sodium channel blocker used primarily for rhythm control in atrial fibrillation. A key clinical pearl with this medication is that it should generally be avoided in patients with structural heart disease due to the risk of proarrhythmia.
Dofetilide and sotalol are both Class III antiarrhythmics that work by blocking potassium channels and prolonging cardiac repolarization. Because of their ability to prolong the QT interval, both agents carry a risk of torsades de pointes and require careful monitoring. Dofetilide initiation typically requires hospitalization to monitor the QT interval and adjust dosing based on renal function. Sotalol also requires attention to renal function and ECG monitoring, and it has additional beta-blocking effects that can contribute to bradycardia and fatigue.
Throughout this episode, we will break down the mechanisms, common clinical uses, and key safety pearls for these medications to help you better understand how they fit into arrhythmia management.
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Transcript
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| 0:00.0 | Hey all, welcome back to the real life pharmacology podcast. I'm your host, pharmacist, Eric Christensen. |
| 0:05.4 | Thank you so much for listening today. I am going to finish up on antirthmics. |
| 0:11.7 | I spent quite a bit of time on amyodorone, really, really important drug that you need to pay |
| 0:17.2 | attention to on board exams. You do see it quite a bit in practice. |
| 0:25.8 | Now I'm going to throw out some of the most important things of some of the other agents. |
| 0:30.6 | But before I do that, definitely go check out real-life pharmacology.com. |
| 0:32.9 | Simply subscribing with an email. |
| 0:40.0 | We'll get you access to our free study guide, 31 page PDF on the top 200 drugs. |
| 0:45.2 | Great, no-brainer to have, if you're on practice or if you're taking pharmacology exams or board exams coming up, simply go to snag that for free. Absolutely. |
| 0:49.8 | Again, that's at real-life pharmacology.com. |
| 0:53.9 | All right. |
| 0:54.4 | So let's get into kind of some specific agents, |
| 0:58.2 | and I'm really going to highlight some of the most important things |
| 1:01.0 | that you're going to see in practice. |
| 1:03.0 | Some of these aren't used terribly often, |
| 1:05.8 | but I have periodically seen them tested on throughout my career on board exams and things of that |
| 1:13.5 | nature. So, yeah, again, going to highlight the most important things here. So first off, I do want |
| 1:21.6 | to mention dejoxin. This is classified as a cardiac glycoside. Mechanistically, it inhibits sodium potassium ATP. |
| 1:33.3 | This increases intracellular calcium and has a positive ionotropic effect. |
| 1:41.3 | So it enhances vagal tone and slows AV node conduction. The two primary uses are rate |
| 1:52.8 | control in atrophibulation, so that makes sense that it could be classified as an antirethymic. |
| 1:59.0 | I would probably say that's the more common indication. |
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