Rodent management challenges


There’s been no innovation or change in rodent control since the Middle Ages, and the world still has a rat problem.


Lethal rat poisons may enter the ecosystem where they can become toxic to the environment, pets and wildlife if not used as directed.


According to the American Association of Poison Control Centers, over 10,000 children are accidentally poisoned yearly in the USA alone.


Killing rats often creates a rebound effect. There’s no sustained reduction in population: surviving rats can reproduce even faster and neighboring rats can move in.


Changing the paradigm: ContraPest gets at the root cause of the problem

Killing with poisons and traps isn’t just inhumane. It simply isn’t sustainable over the long run. Traditional methods of rat management knock down the population by using traps or rodenticides. As the population decreases and there are less rats and more resources, the population often rebounds in greater numbers than before. Rats are opportunistic breeders and take advantage of more food and less competition. Four pairs of breeding adult rats and their progeny can produce up to 15 million rats in one year. When rats ingest ContraPest both males and females lose the ability to reproduce. Instead of exponentially increasing their populations, they die of natural causes While alive they guard their territory from neighboring rats, who would invade if there were a sudden drop in population.

ContraPest is a sustainable, non-lethal solution to the rodent problem. Rats love it!

Rats choose to consume ContraPest because of the high water, fat and sweet content of the bait. They return to the bait again and again even in the presence of high value foods.

Continued consumption of ContraPest leads to infertility in both male and female rats. There are no other adverse side effects.

Rats, unlike mice, need to consume 10% of their body weight in water each day. ContraPest provides an attractive source of liquid. Once ingested, ContraPest is quickly metabolized by the rat and is environmentally neutral when excreted.

ContraPest is specifically formulated for rats and does not affect other animal species or humans. It’s a sustainable and humane approach to pest control.


The SenesTech Mission

SenesTech aims to provide for the more humane treatment of animals, to improve the quality of human life, and to enhance environmental stewardship through global application of our animal fertility control technology. To that end, we are currently applying our revolutionary technology to the control of rats in urban and agricultural settings.


Curious how ContraPest works? SenesTech CEO Dr. Loretta Mayer makes it sound simple on Stephen Hawking’s “Brave New World” TV show. Watch video.

SenesTech is pleased to announce we have received EPA Registration as of August 2nd, 2016 for our first product ContraPest. For more information, please click here.

Our first real-world study: The New York Subway. If you can make it there, you can make it anywhere.

Fighting a losing battle with the rodents who infest the New York Subway, the New York MTA was looking for an innovative alternative. They had tried everything from lethal poisons to hunting sprees by citizen militias. Nothing worked. Then they found out about SenesTech’s ContraPest technology. Wasting no time, they partnered with SenesTech and the National Institute of Health in a first-of-its-kind pilot program to test ContraPest in one of the world’s toughest environments. The results are more than promising.

Chicago Magazine Article
The Chicago Transit Authority is making birth control free and conveniently located—for rats.
Read more

New York Times Article
They have thwarted the poisons. They have evaded the traps. The rats of the New York City subway system have…Read more

Los Angeles Times Article
New York City declares war on rats…budgeting $611,000 for an anti-rat program targeting areas where rodents congregate. Read more