Chapter 188 - Antifungals Flashcards
Mainstay treatment of tinea capitis and onychomycosis
Systemic antifungals
Main target of both systemic and topical antifungals is
Ergosterol
All antifungals block the biosynthesis of ergosterol, except for ____ creating cell membrane pores
Polyenes
Azoles exhibit ___ activity against yeasts and ___ activity against dermatophytes compared to allylamines.
Superior
Less
Allylamine is ___ against Candida species and ___ aginst dermatophytes
Fungistatic
Fungicidal
MOA of allylamine
Inhibition of squalene epoxidase enzyme
The fungistatic effect of allylamine is due to ___ while fungicidal activity is due to ____
Deficiency of ergosterol
Buildup of squalene
Aside from antifungal activity, naftifine has (2) more additional properties
Antibacterial
Antiinflammatory (suppress synthesis of LT and PGs)
Lipophilic properties of naftifine persist in stratum corneum up to ___ days
5
Absorption of oral terbinafine is not influenced by food intake
True or False
True
Topical terbinafine is efficacious in treatment of all superficial mycoses.
True or False
True
FDA approved treatment for tinea capitis
Terbinafine
Griseofulvin
Terbinafine is lipophilic and can persist in keratinized tissue up to ___ mos after last dose
6
SJS/TEN has been reported within __ weeks of treatment
4-5
Most unique side effect of terbinafine (3)
Ageusia (altered taste)
Loss of smell
Tongue discoloration
Most serious side effect of terbinafine (2)
Hepatotoxicity
Hematologic disorders
FDA approved indications of terbinafine (2)
Tinea unguium
Tinea capitis
Off label indications for terbinafine (2)
Tinea pedis, cruris, corporis
Seborrheic dermatitis
All oral antifungals are category C except
Terbinafine Category B
Terbinafine is a CYP 2C9 inducer and should not be given ___ which may increase risk of thrombosis
Warfarin
Terbinafine is a CYP 2D6 inhibitor and should not be given with
TCA
SSRI
Haloperidol
Pregnancy Category of Butenafine
C
Examples of triazoles (4)
Fluconazole
Itraconazole
Efinaconazole
Isavuconazole
MOA of azole
Inhibition of lanosterol demethylase
14 alpha-demethylase
Azoles can be fungicidal in hugh concentrations.
True or False
True
First developed topical imidazole that can disrupt mycotic phospholipids resulting in leakage of intracellular iron, degradation of nucleic acids, suppression of cell respiration
Clotrimazole
Clotrimazole can be used for all superficial mycoses, achieveing mycological cure rates ranging from ___ in dermatophytosis and ___ in cutaneous candidiasis
60-100%
80-100%