How is micafungin administered?

How Micafungin is Administered

Micafungin is administered exclusively by intravenous infusion over one hour, after reconstitution and dilution to a final concentration between 0.5-4 mg/mL in either 0.9% sodium chloride or 5% dextrose. 1

Preparation and Reconstitution

The drug comes as a lyophilized powder in 50 mg or 100 mg single-dose vials that must be reconstituted using strict aseptic technique, as no preservative is present 1:

• Reconstitution: Add 5 mL of diluent to create either 10 mg/mL (50 mg vial) or 20 mg/mL (100 mg vial) concentration
• Protect from light: Both reconstituted and diluted solutions must be protected from light (though infusion tubing does not need covering)
• Storage limits: Combined storage time of reconstituted and diluted solution cannot exceed 12 hours at room temperature (20-25°C) 1

Dilution Protocol

For Adults:

Add the appropriate volume of reconstituted micafungin to 100 mL of 0.9% sodium chloride or 5% dextrose 1

For Pediatric Patients:

1. Calculate total dose in mg: weight (kg) × mg/kg dose
2. Calculate volume needed by dividing dose by vial concentration (10 or 20 mg/mL)
3. Add to appropriate volume of diluent to achieve final concentration of 0.5-4 mg/mL
4. Critical: Concentrations >1.5 mg/mL must be administered via central catheter to decrease infusion reaction risk 1

Infusion Parameters

• Duration: Infuse over exactly one hour in both adults and children 1
• Rate warning: More rapid infusions increase risk of histamine-mediated reactions 1
• Line preparation: Flush existing IV line with 0.9% sodium chloride prior to micafungin infusion 1
• Route: Intravenous infusion only—no other routes are approved 1

Dosing by Indication

Based on guidelines and FDA labeling 2, 3, 2, 4:

Adults:

• Candidemia/invasive candidiasis: 100 mg daily
• Esophageal candidiasis: 150 mg daily
• Oropharyngeal candidiasis (refractory): 100 mg daily
• Empiric therapy in ICU: 100 mg daily

Pediatric patients:

• Weight-based dosing typically 2-4 mg/kg daily (maximum varies by indication)
• Neonates may require different dosing due to altered pharmacokinetics 4

Critical Safety Considerations

• No renal adjustment needed: Micafungin does not require dose modification for renal insufficiency or dialysis 4
• Hepatic dysfunction: Only caspofungin (not micafungin) requires dose reduction for moderate-to-severe hepatic impairment 4
• Central line requirement: Concentrations >1.5 mg/mL mandate central venous access 1
• Discard unused portions: Vials are preservative-free and must be discarded after single use 1