THE WOODLANDS, Texas--(BUSINESS WIRE)--Repros Therapeutics (NasdaqGM:RPRX) today announced that the Company has entered into an amendment with the National Institutes of Health (NIH) to its existing exclusive license for Proellex® that revises the existing milestones and dates for performance to provide additional time to lift the current clinical hold on Proellex or select a second generation molecule for further development from the family of anti-progestational agents covered by the license.