Foxglove (Digitalis): Uses & Benefits for Heart Conditions

Foxglove (Digitalis purpurea) is the natural source of digoxin and digitoxin—cardiac glycosides used for centuries to treat heart conditions.

Primary Indications

• Heart Failure with Reduced Ejection Fraction (HFrEF): Increases myocardial contractility (positive inotrope) and slows AV nodal conduction, improving symptoms and reducing hospitalizations.
• Atrial Fibrillation / Flutter: Controls ventricular rate by enhancing vagal tone and slowing AV node conduction.

Historical & Limited Uses

Previously used for paroxysmal supraventricular tachycardia, atrial flutter, and valvular heart disease—now largely replaced by safer, more effective agents (beta-blockers, calcium channel blockers, ablation, newer HF drugs like ARNIs, SGLT2 inhibitors).

Critical Safety Notes

• Narrow therapeutic index: Toxic dose close to therapeutic dose.
• Monitoring required: Serum digoxin level, electrolytes (K⁺, Mg²⁺), renal function, ECG.
• Toxicity signs: Nausea, visual changes (yellow halos), arrhythmias, hyperkalemia.
• Interactions: Amiodarone, verapamil, dronedarone, clarithromycin, diuretics (hypokalemia) increase levels.

Digitalis remains a guideline-recommended second-line therapy for HFrEF and rate control in AF when first-line agents are insufficient or contraindicated.