Systemic absorption of ciclopirox was determined in 5 patients with dermatophytic onychomycoses, after application of PENLAC (ciclopirox topical solution) ® NAIL LACQUER (ciclopirox) Topical Solution, 8%, to all 20 digits and adjacent 5 mm of skin once daily for six months. Random serum concentrations and 24 hour urinary excretion of ciclopirox were determined at two weeks and at 1, 2, 4 and 6 months after initiation of treatment and 4 weeks post-treatment. In this study, ciclopirox serum levels ranged from 12-80 ng/mL. Based on urinary data, mean absorption of ciclopirox from the dosage form was < 5% of the applied dose. One month after cessation of treatment, serum and urine levels of ciclopirox were below the limit of detection.
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