Furosemide Conversion Guidelines

Introduction to Furosemide Conversion

• The European Society of Cardiology recommends converting 40mg IV furosemide BID to 80mg oral furosemide BID, resulting in a total daily dose of 160mg oral, using a 2:1 oral-to-IV conversion ratio based on furosemide's approximately 50% oral bioavailability 1, 2

Guideline Support and Recommendations

• The European Society of Cardiology guidelines suggest that for patients on chronic diuretic therapy, the initial IV dose should be at least equivalent to the oral dose, implying that oral doses need to be approximately double the IV dose to achieve equivalent diuretic effect 1, 2, 3
• The European Society of Cardiology recommends starting with 20-40mg IV furosemide for patients with new-onset acute heart failure not on diuretics 1, 2

Important Clinical Considerations

• Patients with cirrhosis may have better oral bioavailability than those with heart failure, as cirrhotic patients demonstrate good oral bioavailability despite their disease state 4, 5, 6, 7
• When converting from IV to oral furosemide, monitor symptoms, urine output, renal function, and electrolytes regularly, as recommended by the European Society of Cardiology 1, 2, 3

Conversion Pitfalls to Avoid

• The European Society of Cardiology guidelines imply that a 1:1 conversion ratio should not be used, as this will result in inadequate diuresis due to reduced oral bioavailability 6
• Avoid IV furosemide in cirrhotic patients when oral is feasible, as IV administration can cause acute reductions in glomerular filtration rate, according to the American Association for the Study of Liver Diseases 4, 5, 6, 7