Calculates digoxin dosing for atrial fibrillation rate control (0.125–0.25 mg/day) and rapid digitalization for heart failure (loading: 0.25 mg IV/PO q6h × 4 doses). Goal trough level: 0.5–0.9 ng/mL for heart failure. Check levels 6–8 hours after last dose. Adjust for renal function, weight, and age. Narrow therapeutic index requires close monitoring.
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