How many milliliters of reconstituted liposomal amphotericin B should be added to each 500 mL 5% dextrose (D5W) bag, and what infusion rate in mL per hour should be used for each dose?

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Reconstitution and Administration of Amphotericin B Deoxycholate

For a 50 mg vial reconstituted and diluted in 500 mL of 5% dextrose (D5W), add the entire reconstituted vial to each bag; infuse at 62.5-83 mL/hr over 6-8 hours.

Step-by-Step Preparation

Reconstitution

  • Add 10 mL of sterile water (without bacteriostatic agent) directly to the 50 mg vial 1
  • Shake immediately until completely clear to create a 5 mg/mL concentrate 1
  • Critical: Use a needle ≥20 gauge 1

Dilution

  • Add the entire 10 mL of reconstituted solution (50 mg) to a 500 mL D5W bag 1
  • This creates a final concentration of 0.1 mg/mL (50 mg in 500 mL) 1
  • Verify D5W pH >4.2 before use - if pH <4.2, add buffer solution first 1

Infusion Rate Calculation

For 50 mg dose in 500 mL over 6-8 hours:

  • 6-hour infusion: 83 mL/hr
  • 8-hour infusion: 62.5 mL/hr

The infusion rate should not exceed 0.08 mg/kg/hour 2. For a typical adult (60-70 kg), this translates to approximately 5-6 mg/hour maximum, which aligns with the 6-8 hour infusion window for 50 mg 2.

Critical Safety Considerations

Pre-medication Required

  • Administer diphenhydramine or acetaminophen 30-60 minutes before infusion to prevent infusion-related reactions 2

Nephrotoxicity Prevention

  • Give 1 liter of normal saline before AND after the amphotericin infusion 2
  • This is strongly recommended to minimize kidney damage

Dosing Pitfalls

Do NOT prepare 25 mg (one vial) in 500 mL - this creates excessive insoluble particles that will clog filters and prevent complete drug delivery 3. Research shows only 11.3% of drug flows through when 25 mg is diluted in 500 mL 3.

Acceptable preparations:

  • 50 mg in 500 mL (recommended) 3
  • 25 mg in 250 mL 3
  • 25 mg in 50 mL 3

Storage and Handling

  • Store prepared solutions at 4-8°C (refrigerated) 4
  • Use within 24 hours of preparation 4
  • Never use saline or solutions containing bacteriostatic agents - these cause precipitation 1
  • Protection from light is unnecessary 4

Filter Requirements

If using an inline filter, ensure pore diameter ≥1.0 micron to allow passage of the colloidal dispersion 1

Monitoring During Infusion

Record vital signs (temperature, pulse, respiration, blood pressure) every 30 minutes for the first 2-4 hours 1

References

3
Research

Influence of 5% dextrose volume on amphotericin B deoxycholate preparation.

The Journal of pharmacy and pharmacology, 2016

4
Research

Practical guidelines for preparing and administering amphotericin B.

American journal of hospital pharmacy, 1992

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.