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A 74 year old man with atrial fibrillation starts digoxin 125 micrograms daily with no loading dose. His creatinine is 118 micromol/L, eGFR 44 mL/min/1.73 m2, potassium 4.3 mmol/L and weight 71 kg, and at this level of renal function his digoxin half-life is about 60 hours. When will his concentration be at steady state?
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