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Torsemide infusion dose

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Here is a focused summary of torsemide infusion dosing from authoritative sources:

Torsemide IV Infusion Dosing

When to Use Infusion vs. Bolus

Torsemide is most commonly given as IV or oral bolus. A continuous IV infusion is reserved for:
  • Severe volume overload (>5-10 liters)
  • Diuretic resistance (inadequate response to bolus dosing)
  • Failure to respond to conventional loop diuretic therapy
Important note: Per the Michigan Medicine inpatient guidelines (2022), IV torsemide is no longer commercially available in the US as an IV formulation. Oral torsemide (with its high ~80% bioavailability) or IV furosemide is the practical alternative in most US settings.

Dosing Table (Braunwald's Heart Disease)

Clinical ScenarioRouteTorsemide Dose
Moderate overloadIV bolus10-20 mg
Severe overloadIV bolus20-100 mg
Severe overloadContinuous infusion5-20 mg/hr
Refractory to loop diureticsContinuous infusion5-20 mg/hr (titrate)
  • Braunwald's Heart Disease (Table 49.6)

Dose Conversion Reference

When transitioning between agents:
  • 40 mg oral furosemide ≈ 20 mg IV furosemide ≈ 20 mg IV or oral torsemide
Torsemide has significantly higher oral bioavailability (~80-100%) vs. furosemide (~40-70%), making oral torsemide a preferred oral option when IV access is not available.

Infusion Protocol (Practical)

  1. Loading dose: Give an initial IV bolus first (10-20 mg for moderate, 20-100 mg for severe disease)
  2. Maintenance infusion: Start at 5 mg/hr; titrate upward to 20 mg/hr based on urine output
  3. Target urine output: Typically 100-200 mL/hr or net negative fluid balance of 1-2 L/day
  4. Titration: Double the infusion rate if urine output is inadequate after 1-2 hours
  5. Monitor: Serum Na+, K+, creatinine, BUN, and blood pressure closely

Evidence: Bolus vs. Continuous Infusion

The DOSE trial (N=308, NEJM 2011) found no significant difference in symptom relief or renal function between continuous infusion and twice-daily bolus dosing of furosemide. High-dose strategy (2.5x oral dose) showed greater net fluid loss and dyspnea relief, but more transient creatinine rises. This data was primarily for furosemide; torsemide-specific infusion RCT data is limited.

Furosemide IV Equivalency for Reference

If torsemide IV is unavailable, furosemide infusion is the standard alternative:
  • Furosemide infusion: 5-40 mg/hr (severe overload)
  • Torsemide to furosemide ratio: 1:2 (20 mg torsemide ≈ 40 mg furosemide)
Bottom line: For torsemide continuous infusion, the standard dose range is 5-20 mg/hr after a loading bolus, titrated to clinical response. Given the limited availability of IV torsemide in many centers, furosemide infusion is the more commonly practiced alternative, with dose adjustment using the 1:2 conversion ratio.

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The one-page A4 reference covers 7 sections:
  1. Agent Overview - Furosemide, torsemide, bumetanide, ethacrynic acid with bioavailability, onset, duration, and max doses
  2. Dose Equivalency Table - Conversion matrix across all four agents (oral and IV) at multiple dose levels, with the key conversion rule highlighted
  3. IV Dosing by Severity - Moderate / Severe / Refractory tiers with bolus and infusion doses for each drug, plus add-on thiazide dosing
  4. Continuous Infusion Protocol - Step-by-step: loading bolus → start rate → titration → target UO → step-down
  5. Diuretic Resistance - Two-column layout: causes vs. management strategies
  6. Special Populations - CKD, hypoalbuminaemia, hepatic cirrhosis, sulfa allergy, post-cardiac surgery
  7. Monitoring Parameters - Frequency and action thresholds for UO, K⁺, Mg²⁺, Na⁺, creatinine, BP, weight, and ototoxicity
Sources: Braunwald's Heart Disease, Harrison's 22E, Brenner & Rector's The Kidney, Fuster & Hurst's The Heart 15E, NKF Primer 8E, 2022 AHA/ACC/HFSA Guidelines, DOSE Trial.

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