Topical Agents for Dermatophytes: Phenol and Derivatives

Topical Agents for Dermatophytes: Phenol and Derivatives ("Happy Cats Cry”/HCC)

1. Haloprogin (C9H4Cl3IO)

  • Brand Name: Halotex®

  • Formulations (SC1): Available as a solution and cream (1%)

  • Characteristics:

    • Photosensitive: should be protected from light to maintain efficacy.

2. Clioquinol (C9H5ClINO)

  • Brand Name: Vioform®

  • Alternative Name: Also known as Iodochlorhydroxyquin

  • History: Initially used as a substitute for iodoform, reflecting its antibacterial and antifungal properties.

  • Formulations (P): Available as a powder for skin conditions (AEPI) such as atopic dermatitis, eczema, psoriasis, and impetigo.

  • Other Forms (OC3): Available as an ointment and cream (3%).

  • Indications:

    • Effectively used vaginally for the treatment of vaginitis.

    • Best use for treating athlete’s foot (tinea pedis) and jock itch (tinea cruris), demonstrating its antifungal activity in localized infections.

3. Ciclopirox olamine (C14H24N2O3)

  • Brand Name: Loprox®

  • Alternative Names: Also known as Ciclopirox ethanolamine and Ciclopiroxolamine.

  • Mechanism of Action (MOA):

    • At low concentrations (FS): Exhibits fungistatic properties which block the transport of amino acids into fungal cells, inhibiting growth.

    • At high concentrations (FC): Exhibits fungicidal properties, causing loss of membrane integrity and disrupting cellular constituents.

  • Approved Uses:

    • Effective against (CCCPV):

      • Cutaneous candidiasis

      • Tinea corporis (whole body)

      • Tinea cruris (groin; jock itch)

      • Tinea pedis (feet; athlete’s foot)

      • Tinea versicolor (discolored skin patches).

    • Considered a second-line agent for the treatment of onychomycosis or tinea unguium (fungal infection of the nail).

  • Formulations (CL1): Available as cream and lotion (1%), allowing for easy application on affected areas and improving patient compliance.