After Vasalgel served as an effective contraceptive in a group of rabbits, researchers succeeded in restoring sperm flow by flushing the gel to clear it from the vas deferens. If you've been following Vasalgel updates, you heard a preview of these findings last year. The full results were
in the journal
Basic and Clinical Andrology
The study followed the progress of seven rabbits that had received injections of Vasalgel, which blocked the release of their sperm
for more than a year
while causing no significant side effects; those effectiveness results were
published last year
. In this second part of the study, after the rabbits received injections to clear the Vasalgel, sperm flow was reestablished.
"The results of the Vasalgel reversibility study in rabbits indicate the implant could be removed, resulting in a quick return of sperm flow," said lead author Donald Waller, Ph.D. The results mark an important milestone in the development of Vasalgel: they provide important proof of concept around restoration of sperm flow, and encourage further development work.
You can read the full study online
Parsemus Foundation policy is to only publish in open-access journals so the results are available free to all
. Want a shorter version, with the results in context? Here's the