Pharmacokinetic study in healthy male volunteers
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Multi-dose
Topical finasteride 0.25% showed measurably lower plasma finasteride levels than oral 1 mg (Cmax 0.46 ± 0.28 ng/mL, AUC 6.64 ± 7.50 ng/mL·h after multiple doses). Establishes the basic principle that topical fin reduces systemic exposure relative to oral.