Superficial Fungal Infections - notebookLM

1. Recognize the pharmacologic category, dosage form, and Rx vs OTC status of antifungals Antifungals used for superficial fungal infections fall into several categories based on their availability and route of administration:

• OTC Topical Agents: These include clotrimazole, miconazole, tolnaftate, undecylenic acid, butenafine, and terbinafine. They are available in numerous dosage forms such as creams, lotions, ointments, solutions, foams, shampoos, powders, aerosol sprays, gels, and suspensions.

• Rx Topical Agents: These require a prescription and include ciclopirox, nystatin (used for Candida, not dermatophytes), betamethasone/clotrimazole, ketoconazole, luliconazole, tavaborole, and efinaconazole.

• Rx Oral Agents: Systemic treatment requires a prescription and includes medications like fluconazole, itraconazole, terbinafine, and griseofulvin.

2. Counsel a patient on how to prevent and avoid spreading a superficial fungal infection To prevent development and spread of infection, you should counsel patients to:

• Keep areas clean and dry: Cleanse the skin daily with soap and water and thoroughly pat dry, especially between the toes.

• Manage footwear: Avoid tight-fitting or enclosed shoes for prolonged periods, wear moisture-wicking socks, and use protective shower shoes in public showers.

• Avoid sharing personal items: Do not share towels, clothing, combs, razors, or bedding, especially when an active infection is present.

• Launder appropriately: Wash contaminated towels and clothing in hot water to kill the fungi.

3. Recognize the nomenclature of superficial fungal infections and which require a prescription or referral Superficial dermatophyte infections are termed "tinea" (ringworm) followed by the location on the body.

• Tinea pedis: Foot (athlete's foot).

• Tinea unguium (Onychomycosis): Toenails or fingernails.

• Tinea corporis: Body.

• Tinea cruris: Groin (jock itch).

• Tinea capitis: Scalp.

• Tinea faciei: Face.

• Tinea barbae: Beard.

• Tinea manuum: Hands.

Conditions requiring referral or prescription: Infections of the hair/hair follicles (scalp and beard) and nails often require oral prescription therapy or stronger topical agents because standard OTC topicals cannot penetrate these areas effectively. Referral is also necessary for patients with a weakened immune system, unmanaged diabetes, signs of systemic or bacterial infection, involvement of mucous membranes, or if a prior self-care attempt failed. Additionally, confirming a fungal diagnosis requires tissue scraping and laboratory evaluation, which requires a provider referral.

4. Differentiate between the antifungal OTC formulations and generations

• Formulations: Creams and gels work best for most cases. Ointments are ideal for scaly or weeping areas, while solutions are easier to apply to hairy areas. Powders do not work well for active treatment but are useful for prevention, such as inside shoes.

• Earlier generation (Fungistatic): Clotrimazole, miconazole, and tolnaftate. These are approved for ages 2 and up, are typically applied twice daily for 4 weeks, and are less expensive.

• Second generation: Butenafine and terbinafine creams/sprays. Approved for ages 12 and up, these are applied twice daily for 1 week or once daily for 4 weeks. Terbinafine (fungicidal) is preferred if the infection covers the bottom or sides of the feet.

• Third generation: Terbinafine gel formulation (fungicidal). Approved for ages 12 and up, it requires only once-daily application for 1 week.

5. Recommend an OTC product and counsel a patient on proper treatment of tinea; recognize exclusions for self-treatment

• Recommendation & Counseling: Effective OTC products include terbinafine, butenafine, tolnaftate, clotrimazole, and miconazole. Patients should be counseled that typical treatment duration is 4 weeks, and while they may see a cure by 2 weeks, they should complete the therapy to prevent recurrence. Patients should contact their primary care provider if there is no improvement after 4 weeks or if the infection worsens. Patients should always check the active ingredient on the label, as brand names (like Lotrimin) can contain different active drugs.

• Exclusions for self-treatment: Do not recommend OTC self-care if the patient is immunocompromised, has unmanaged diabetes, shows signs of a systemic or bacterial (oozing/purulent) infection, if the infection is on the scalp, beard, nails, or mucous membranes, or if prior appropriate self-treatment failed.

6. Recognize the commonly prescribed medications to treat onychomycosis and describe their safety/counseling points For tinea unguium (onychomycosis), topical OTCs like undecylenic acid are only somewhat effective, and Rx topical monotherapy (like ciclopirox) has poor efficacy.

• Effective Rx Oral Medications: Itraconazole and terbinafine are highly effective. (Griseofulvin and ketoconazole are rarely used anymore in adults).

• Safety/Counseling for Systemic Azoles (Itraconazole): These can cause QT prolongation and CYP450 drug-drug interactions. Itraconazole carries a Black Box Warning to avoid use in heart failure and requires gastric acid for absorption, so it should not be used with strong acid-suppressing agents.

• Safety/Counseling for Systemic Terbinafine: Generally well-tolerated, but it carries a risk of hepatotoxicity