Single oral dose escalation pharmacokinetics of pleconaril (VP 63843) capsules in adults

Pleconaril is an orally active broad-spectrum antipicornaviral agent with e xcellent penetration into the central nervous system and nasal epithelium. The authors report the results of a randomized, placebo-controlled, dose es calation study of pleconaril oral capsules following single-dose administra tion of 50 to 1000 mg Fifty-six healthy adults (ages 19-55) participated in the study. Each subject received a single dose of pleconaril oral capsule( s) or an identically matched placebo. Blood samples (n = 19) were obtained over 36 hours postdose, and pleconaril was quantified from plasma by gas ch romatography. Pleconaril disposition was best characterized using a two-com partment open-model with first-order absorption. Fifty-five subjects comple ted the study (31 +/- 10 years, 77.6 +/- 11 kg). The administration of plec onaril was well tolerated. There was no difference in t(max), lambda z, ka, t(1/2elim), Cl/F or Vdss/F among the various dose groups. A significant di fference in both C-max and AUC was observed between study groups; however, this difference became insignificant when the parameters were corrected for dose. C-max and AUC were dose proportional between 50 and 1000 mg (r(2) > 0.97 and 0.90, respectively). Pleconaril demonstrates a favorable safety an d pharmacokinetic profile following single-dose administration. (C) 1999 th e American College of Clinical Pharmacology.