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Birth Control Methods

Birth Control Methods

Vasectomy is a surgical form of male sterilization that involves severing and sealing the vasa deferentia, preventing sperm from mixing with semen during ejaculation. Because a vasectomy does not impact the testes' ability to produce testosterone, hormone levels, libido, and sexual function generally remain unchanged. While vasectomy is highly effective in preventing pregnancy, with a success rate near 99.85%, rare cases of recanalization (spontaneous reconnection) can occur. Although...

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Updated: Jan 13, 2026

Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm

Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm

Published on: March 1, 2019

Compounds Reducing Human Sperm Motility as Potential Nonhormonal Contraceptives Identified Using a High-Throughput

Anthony Richardson¹, Franz S Gruber², David P Day¹

¹Drug Discovery Unit, Wellcome Centre for Anti-Infectives Research, Division of Biological Chemistry and Drug Discovery, University of Dundee, Dundee DD1 5EH, U.K.

|January 8, 2026

Summary

This summary is machine-generated.

Researchers screened 88,773 compounds for nonhormonal contraceptives. While no clinical leads emerged, the study identified tool compounds and improved screening technology for future contraceptive development.

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Last Updated: Jan 13, 2026

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Area of Science:

Reproductive biology and pharmacology
Drug discovery and development

Background:

Developing nonhormonal contraceptives is crucial for reproductive health.
Phenotypic screening offers a pathway to identify novel contraceptive agents.

Purpose of the Study:

To identify potential nonhormonal contraceptive compounds using phenotypic screening.
To investigate chemical series that selectively reduce sperm motility without cytotoxicity.

Main Methods:

Phenotypic screening of 88,773 compounds across nine libraries using an automated robotic platform.
Quantification of human sperm motility and assessment of cytotoxicity in HepG2 cells.

Main Results:

Identification of 9 chemical series with effects on sperm motility.
Selective reduction of sperm motility was a key criterion, alongside minimal cytotoxicity.
No clinically progressable leads were identified in this screening round.

Conclusions:

The study yielded valuable tool compounds for nonhormonal contraceptive research.
Significant advancements were made in screening technology for future drug discovery.
Further optimization and screening are needed to identify clinically viable contraceptive leads.