Azole antifungals

Azole antifungals

Drug monograph · NCLEX study reference
Therapeutic class	Antifungal
Pharmacologic class	Azole (ergosterol synthesis inhibitor)
Onset / peak / duration	Fluconazole once daily with good oral absorption.
Half-life / level	Fluconazole about 30 hours; voriconazole levels sometimes monitored.
Routes	PO (oral), IV
High-alert (ISMP)	No
Black box warning	Yes (see Safety)
Antidote / reversal	Supportive care.
Pregnancy / lactation	High-dose fluconazole avoided in pregnancy.

Nursing pharmacology study reference (NCLEX-style monograph). Numeric values are standard teaching ranges for study and must be verified against current manufacturer labeling before clinical use. This is educational content, not prescribing guidance.

Azole antifungals — Antifungal; Azole (ergosterol synthesis inhibitor).

Identification

• Therapeutic class: Antifungal.
• Pharmacologic class: Azole (ergosterol synthesis inhibitor).

Pharmacology

• Mechanism of action: Inhibit fungal cell membrane sterol synthesis.
• Onset / peak / duration: Fluconazole once daily with good oral absorption.
• Half-life / therapeutic level: Fluconazole about 30 hours; voriconazole levels sometimes monitored.

Clinical use

• Indications: Candidiasis (oral, esophageal, vaginal, systemic), cryptococcal meningitis, aspergillosis (voriconazole), various systemic fungal infections.
• Usual dose, route, frequency: Fluconazole PO or IV daily; others by infection.
• Maximum dose / adjustments: Reduce fluconazole in renal impairment; voriconazole and itraconazole adjusted by hepatic function.

Safety

• Contraindications: Coadministration with many QT-prolonging and CYP3A4-dependent drugs; ketoconazole and itraconazole in heart failure.
• Black box warning: Oral ketoconazole carries a boxed warning for hepatotoxicity and serious QT-related drug interactions (reserved use); itraconazole carries a boxed warning for negative inotropic effects and heart failure and serious interactions.
• Interactions: Strong CYP inhibition raises levels of warfarin, statins, many drugs; QT-prolonging drugs; antacids and acid reducers lower ketoconazole and itraconazole absorption.
• Pregnancy / lactation: High-dose fluconazole avoided in pregnancy.
• High-alert: No.

Adverse effects

• Common side effects: Nausea, headache, rash; voriconazole causes visual disturbances.
• Serious effects to report: Hepatotoxicity, QT prolongation, severe rash, heart failure (itraconazole).
• Antidote / reversal: Supportive care.

Nursing process

• Assessment before administration: LFTs, cardiac and QT history, interacting drugs.
• Interventions during therapy: Review interacting drugs carefully; monitor liver function.
• Monitor: LFTs, ECG if at risk, infection resolution, vision (voriconazole).
• Evaluation / expected outcome: Resolution of fungal infection.

Patient teaching

• Patient teaching: Report yellowing of skin; voriconazole may cause temporary vision changes and sun sensitivity.
• Notify provider if: Yellowing of skin, dark urine, palpitations, vision changes.
• Administration tips: Many interactions; verify before adding other drugs.