Windhoek, Namibia — Namibian Police have alerted the public, especially women, to be on the look out for a new drug rapists were reportedly using at parties and social functions to tranquillise and rape their victims.

In a notice to the public, the Public Relations Division of the police said that Progesterex has been on the streets for less than a year now.

It said the small pill could cause irreversible damage to women, sterilising victims for good.

The notice explained that the new drug was available to the country's veterinarians for sterilising large animals, and that it was used in combination with another drug, Rohypnol, otherwise known as the "date-rape drug."

"With Rohypnol, all what a rapist needs to do is drop it in a girl's drink," the police said, adding "the girl would not remember anything the next morning, of all that transpired the night before."

Progesterex, which easily dissolves in drinks, was said to work in such a way that victims would never again be able to conceive.

The rapist would thus not have to worry about paternity tests to identify him later.