Digoxin Therapy Guidelines

General Guidelines for Withholding Digoxin

The American Heart Association recommends withholding digoxin when the pulse rate is less than 60 beats per minute or if there is significant sinus or atrioventricular block 1, 2
Digoxin should not be administered to patients with significant sinus or atrioventricular block, unless the block has been addressed with a permanent pacemaker 1, 2
Withhold digoxin when heart rate falls below 60 beats per minute, as bradycardia is a common manifestation of digoxin toxicity 3
Digoxin should be used cautiously in patients taking other drugs that can depress sinus or atrioventricular nodal function (e.g., amiodarone or beta-blockers) 1, 2
Temporarily suspend digoxin during intercurrent illness, planned IV radiocontrast administration, bowel preparation prior to colonoscopy, or prior to major surgery 4

Overt digoxin toxicity is commonly associated with serum digoxin levels greater than 2 ng/mL 2, 3
Toxicity may occur with lower digoxin levels if any of these conditions exist: hypokalemia, hypomagnesemia, or hypothyroidism 2, 3
Concomitant use of medications that increase serum digoxin concentrations, such as amiodarone, clarithromycin, erythromycin, verapamil, quinidine, itraconazole, or cyclosporine 2, 3

Regular monitoring of heart rate and rhythm is essential when using digoxin 1, 2
Target serum digoxin concentration should be maintained between 0.5-0.9 ng/mL 1, 2, 5
Higher serum concentrations (>1.0 ng/mL) have not shown superior outcomes and may increase mortality risk 2, 5
Monitor serum electrolytes (potassium, magnesium) and renal function regularly 5, 3

Cardiac manifestations of digoxin toxicity include bradycardia, enhanced atrial, junctional, or ventricular automaticity, atrioventricular block, and ventricular tachycardia 3
Non-cardiac manifestations of digoxin toxicity include gastrointestinal symptoms (anorexia, nausea, vomiting) and neurological symptoms (visual disturbances, confusion, disorientation) 2, 3

Low doses (0.125 mg daily or every other day) should be used initially if the patient is more than 70 years old 1, 2, 5
Elderly patients are at increased risk of digoxin toxicity due to reduced renal function and low lean body mass 2, 5

If digoxin therapy must be continued after withholding due to bradycardia, use lower doses (0.125 mg daily or every other day) and monitor heart rate and digoxin levels more frequently 5, 3
Consider alternative rate control agents for atrial fibrillation if appropriate 6

The European Society of Cardiology recommends a target ventricular rate <80 bpm for atrial fibrillation at rest 7, 8, 9
The European Society of Cardiology recommends a target heart rate of 110-120 bpm for atrial fibrillation during exercise 7, 8, 9
Digoxin alone often fails to provide adequate rate control during exercise due to its vagotonic mechanism of action, which is overcome by increased sympathetic tone, as noted by the European Heart Journal 7, 10

The European Journal of Heart Failure suggests maintaining a target serum digoxin concentration between 0.6-1.2 ng/mL for atrial fibrillation rate control 11
Regular monitoring should include serum electrolytes and renal function, as recommended by the European Heart Journal 7, 8, 11

The European Heart Journal suggests considering alternative rate control agents, such as beta-blockers or calcium channel blockers, for atrial fibrillation if appropriate, particularly for better exercise rate control 7, 10, 12