Effects of NLS-133, a Potential Non-Hormonal "On-Demand" Male Contraceptive — Stella

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Effects of NLS-133, a Potential Non-Hormonal "On-Demand" Male Contraceptive — Stella

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Phase 2 — Testing in a larger group (up to a few hundred people) to further evaluate safety and begin to assess effectiveness.

Trial locations(1 site)

United States

Population Center for Research in Human Reproduction and Departments of Medicine, University of Washington, Seattle, Washington

Key details

Phase

Safety & dosing

Sponsor

Next Life Sciences

Enrollment target

~10 participants

Started

December 2025

Primary completion

March 2026

This trial's estimated completion date has passed — the record may not be fully up to date.

Age range

18 Years – 55 Years

Sex

Male only

Last updated February 2026

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