The story behind how birth control medication works starts in the 1930s, when it was discovered that injecting progesterone was effective in preventing the onset of pregnancy. Progesterone, a hormone naturally produced by the body, is generally more prevalent in females than in males. Synthesizing the hormone was conducted, with the synthetic version of the chemical proving to be just as effective as the real thing. Research was later conducted into finding out whether or not the body can be induced to produce more of the hormone via introducing external chemicals. Estrogen was later found to have similar effects to progesterone, leading to tests that mirrored the ones conducted for progesterone. Both hormones, and their effect on ovulation, formed the basis of the modern contraceptive pill.
The pills work by deceiving the body, forcing it to believe (thanks to hormonal signals induced by the pills) that the woman is already pregnant. Since the ovaries do not release egg cells if the female is already pregnant, this has the effect of preventing conception. Progesterone and estrogen levels are known to be at their highest during pregnancy, so an increase in one or the other would usually be enough to fool the body's physiology into thinking it is pregnant. Other hormones may be substituted by some other medications, oestrogen is a prominent example, but the two aforementioned hormones are the most commonly cited ones.
Another effect produced by certain birth control pills is inhibiting Follicle-Stimulating Hormone (FSH) and Luteotrophic Hormone (LH). These two hormones are known to cause the ovaries to release the egg cell into the body and have a role in the ovulation cycle. By preventing the body from producing them, an effect similar to high levels of progesterone or estrogen is achieved. The effectiveness of the two tactics is essentially equivalent to one another, though there are some drawbacks to such tactics.
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