Anovulant -

Without an LH surge, the ovaries cannot release an egg, making fertilization impossible.

Anovulants primarily work by acting on the hypothalamus-pituitary system to suppress the secretion of and Follicle Stimulating Hormone (FSH) . anovulant

Use is considered morally licit when the primary intent is to treat a serious disease (like endometriosis), even if temporary sterility is a foreseen side effect. Without an LH surge, the ovaries cannot release