1. Antifungal Agents
Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

2. Antifungal Agents
Drugs used to treat infections caused by fungi
• Systemic and topical
Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

3. Fungi
• Also known as mycoses
• Very large and diverse group of
microorganisms
• Broken down into yeasts and molds
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4. Yeasts
• Single-cell fungi
• Reproduce by budding
• Very useful organisms
– Baking
– Alcoholic beverages
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5. Molds
• Multicellular
• Characterized by long, branching filaments
called hyphae
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6. Mycotic Infections
Four General Types
• Cutaneous
• Subcutaneous
• Superficial
• Systemic*
*Can be life-threatening
*Usually occur in immunocompromised host
Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

7. Mycotic Infections
Candida albicans
• Due to antibiotic therapy, antineoplastics,
or immunosuppressants
• May result in overgrowth and systemic infections
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8. Mycotic Infections
In the mouth:
• Oral candidiasis or thrush
• Newborn infants and immunocompromised patients
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9. Mycotic Infections
Vaginal candidiasis:
• “Yeast infection”
• Pregnancy, diabetes mellitus, oral contraceptives
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10. Antifungal Agents
Systemic
• Examples: amphotericin B, fluconazole,
ketoconazole, itraconazole
Topical
• Examples: clotrimazole, miconazole, nystatin
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11. Antifungal Agents
Broken down into four major groups based
on their chemical structure
• Polyenes: amphotericin B and nystatin
• Flucytosine
• Imidazoles: ketoconazole, miconazole, clotrimazole,
fluconazole
• Griseofulvin
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12. Antifungal Agents:
Mechanism of Action
Polyenes: amphotericin B and nystatin
• Bind to sterols in cell membrane lining
• Allow K+ & Mg++ to leak out, altering fungal cell
metabolism
• Result: fungal cell death
Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

13. Antifungal Agents:
Mechanism of Action
flucytosine
• Also known as 5-fluorocytosine (antimetabolite)
• Taken up by fungal cells and interferes with DNA
synthesis
• Result: fungal cell death
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14. Antifungal Agents:
Mechanism of Action
Imidazoles
ketoconazole, miconazole, clotrimazole, fluconazole
• Inhibit an enzyme, resulting in cell membrane
leaking
• Lead to altered cell membrane
• Result: fungal cell death
Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

15. Antifungal Agents:
Mechanism of Action
griseofulvin
• Disrupts cell division
• Result: inhibited fungal mitosis (reproduction)
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16. Antifungal Agents: Side Effects
amphotericin B
“Shake and Bake”
fever chills headache anorexia
malaise nausea hypotension tachycardia
muscle and joint pain
lowered potassium and magnesium levels
*renal toxicity
*neurotoxicity: seizures and paresthesias
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17. Antifungal Agents: Side Effects
fluconazole
• nausea, vomiting, diarrhea, abdominal pain,
• increased liver function studies
flucytosine
• nausea, vomiting, anorexia
griseofulvin
• rash, urticaria, headache, nausea, vomiting, anorexia
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18. Antifungal Agents:
Nursing Implications
• Before beginning therapy, assess for
hypersensitivity, possible contraindications,
and conditions that require cautious use.
• Obtain baseline VS, CBC, liver function
studies, and ECG.
• Assess for other medications used
(prescribed and OTC) in order to avoid
drug interactions.
Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

19. Antifungal Agents:
Nursing Implications
• Follow manufacturer’s directions carefully
for reconstitution and administration.
• Monitor VS of patients receiving IV infusions
every 15 to 30 minutes.
• During IV infusions, monitor I & O and
urinalysis findings to identify adverse
renal effects.
Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

20. Antifungal Agents:
Nursing Implications
amphotericin B
• To reduce the severity of the infusion-related
reactions, pretreatment with an antipyretic
(acetaminophen), antihistamines, and antiemetics
may be given.
• A test dose of 1 mg per 20 mL 5% dextrose in
water infused over 30 minutes should be given.
• Use IV infusion pumps and the most distal
veins possible.
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21. Antifungal Agents:
Nursing Implications
• Tissue extravasation of fluconazole at the IV
site may lead to tissue necrosis—monitor IV
site carefully.
• Oral forms of griseofulvin should be given
with meals to decrease GI upset.
• Monitor carefully for side/adverse effects.
Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.

22. Antifungal Agents:
Nursing Implications
Monitor for therapeutic effects:
• Easing of the symptoms of infection
• Improved energy levels
• Normal vital signs, including temperature
Copyright © 2002, 1998, Elsevier Science (USA). All rights reserved.