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Liposome encapsulated prostaglandin E1 in erectile dysfunction: correlation between in vitro delivery through foreskin and efficacy in patients.

Abstract：

OBJECTIVES:To test the delivery of prostaglandin E1 (PGE1) in novel transdermal liposomal formulations through foreskin and to determine whether there is a correlation between in vitro transdermal absorption and in vivo efficacy in patients with erectile dysfunction. METHODS:The in vitro transdermal absorption of PGE1 through excised foreskin from liposomal formulations was tested in diffusion cells using radiolabeled drug. The in vivo studies were carried out on 5 patients (aged 54 to 70 years) in a double-blind, placebo-controlled fashion. The patients were treated topically on the penis with three different active formulations containing 0.05% PGE1 and a placebo at least 1 week apart. The change in systolic peak flow velocities in the cavernosal arteries after treatment was monitored by duplex color Doppler ultrasonography with spectral analysis every 15 minutes for 1 hour. RESULTS:The permeability coefficient (Kp) of PGE1 from the three liposomal formulations tested was found to be 0. 10, 1.66, and 3.82 x 10(-4) cm/hr, respectively. Peak systolic flow velocities in the deep cavernosal arteries of patients increased significantly compared with preapplication values (0.05 < P < or = 0.1) after application of two of the transdermal liposomal PGE1 formulations tested (the two with the highest Kp). The highest mean peak systolic flow velocity was achieved at 45 minutes after application of the formulations. The most effective formulation in this study resulted in a sevenfold increase in mean flow velocity compared with baseline values. CONCLUSIONS:Topical application of PGE1 in a novel transdermal liposomal delivery system can enhance penetration of the drug into the deep cavernosal bodies and increase peak systolic flow velocities in patients with erectile dysfunction. The transdermal flux and permeability of PGE1 measured in vitro correlate well with the color Doppler ultrasound results in patients. The efficacy of a formulation in the development process may be predicted from in vitro absorption studies.

journal_name

Urology

journal_title

Urology

authors

Foldvari M,Oguejiofor C,Afridi S,Kudel T,Wilson T

doi

10.1016/s0090-4295(98)00299-4

subject

Has Abstract

pub_date

1998-11-01 00:00:00

pages

838-43

issue

eissn

0090-4295

issn

1527-9995

pii

S0090429598002994

journal_volume

pub_type

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Liposome encapsulated prostaglandin E1 in erectile dysfunction: correlation between in vitro delivery through foreskin and efficacy in patients.