This study is being done to see how the body is affected when a study drug is applied to both feet if the subject has athlete's foot or to both feet and the groin area if the subject has both athlete's foot and jock itch. Safety of the drug and how well the drug works will also be measured.
Study population, diagnosis, and main criteria for inclusion: Tinea pedis and Tinea cruris (NAFT-500): Male or non-pregnant female subjects aged 12 to 17 years, 11 months old of any race with Tinea pedis and Tinea cruris infections confirmed by a positive potassium hydroxide (KOH) analysis from both the feet and bikini area. Both cases (feet and bikini area) must be characterized by clinical evidence of a Tinea pedis and Tinea cruris infection. Additional, approximately 4 pharmacokinetic (PK) evaluable adult subjects with the same condition will serve as a control. Tinea pedis (NAFT-600): Male or non-pregnant female subjects aged 12 to 17 years, 11 months old of any race with Tinea pedis infection confirmed by a positive potassium hydroxide (KOH) analysis from both feet. Both feet must be characterized by clinical evidence of a Tinea pedis infection. Additional, approximately 4 pharmacokinetic (PK) evaluable adult subjects with the same condition will serve as a control.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
56
Applied to both feet and groin area
Applied to both feet only
Applied to both feet and groin area
Merz Investigative Site #001272
Austin, Texas, United States
Merz Investigative Site #001261
College Station, Texas, United States
Merz Investigative Site #180001
Santo Domingo, Santo Domingo Province, Dominican Republic
Merz Investigative Site #504001
San Pedro Sula, San Pedro Sula, Honduras
Naftifine Hydrochloride Pharmacokinetics Variables, Single and Multiple Dose
Variables will be derived from naftifine plasma concentration at day 1. Variables to be analyzed: \- Partial area under the plasma concentration-time curve (0-24 hours postdose) (AUC), as calculated using the linear trapezoid rule. Variables will be derived from naftifine plasma concentration at day 14. Variables to be analyzed: \- Area under the plasma concentration-time curve (AUC) within one dosing interval at steady state (SS). AUCτ,ss= Area under the concentration curve within a dosing interval (τ = 24 hours) at steady state
Time frame: Day 1 and Day 14
Naftifine Hydrochloride Pharmacokinetics Variables, Single and Multiple Dose
Variables will be derived from naftifine plasma concentration at day 1. Variables to be analyzed: \- Maximum observed plasma concentration (Cmax): the highest plasma concentration in each subject after single dose. Variables will be derived from naftifine plasma concentration at day 14. Variables to be analyzed: \- Maximum observed plasma concentration (Cmax): the highest plasma concentration in each subject at steady state (SS).
Time frame: Day 1 and Day 14
Efficacy Variables
Efficacy variables to be analyzed after 2 weeks of once daily application of both products (NAFT-500 or NAFT-600). Efficacy variables to be analyzed: * Complete cure * Treatment effectiveness * Mycological cure * Clinical success * Clinical cure
Time frame: Day 28
Efficacy Variables
Efficacy variables to be analyzed after 2 weeks of once daily application of both products (NAFT-500 or NAFT-600). Efficacy variables to be analyzed: \- Subject satisfaction
Time frame: Day 28
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Applied to both feet