Voriconazole (Vfend)

C. diff Risk

Low

Oral Bioavailability

Excellent

Approximate Cost

Spectrum Of Activity

Dosing

Severe impairment (Child-Pugh C)
Should only be used if benefit outweighs risk

Mild to moderate (Child-Pugh A/B)
Standard loading dose then reduce maintenance by 50%

PO DosingWeight less than 40kg - 100mg q12h
Weight greater than/equal to 40kg - 200mg q12h

IV Dosing6mg/kg IV q12h x 2 doses then 4mg/kg IV q12h

This medication is currently not on hospital formulary - please contact pharmacy if it is needed.

General Information

Common Usage

Candida infections both mucocutaneous and invasive - i.e. Candidemia.

Antifungal prophylaxis in immunocompromised patients.

Drug Monitoring

Therapeutic drug monitoring may be helpful to ensure adequate concentrations and exclude toxicity (Discuss with ID).

QTc interval in patients at elevated risk.

Monitor hepatic profile.

Adverse Effects

  • Drug interactions

  • QTc prolongation

  • Hepatic enzyme abnormalities

  • Rash - up to 20%

  • Visual disturbance

  • Fluorosis

  •  GI upset

Major Interactions

CYP450 interactions ++.

Other QTc prolonging agents.

Recommend review of pt medications due to high frequency of significant interactions.

Pharmacology

Antimicrobial class: Triazole antifungal, Second generation

Pregnancy category: D

Urine penetration: Poor

Lung penetration: Therapeutic

CSF penetration: Therapeutic