FEMFREE is a drug that suppresses the maternal instincts in women. It is not clear how this physical effect is acheived, but it seems likely that it suppresses certain hormones, and likely also reduces the likelihood of conception.
However, the social effects of the drug are even more striking. Shortly after the drug’s introduction, it was outlawed by President Lousewart, which swiflty led to the formation of a black market selling FEMFREE to the women who wanted it.