Birth Control

control pills maintain the same levels of estrogen and progestin throughout the course, while biphasic pills keep the estrogen level the same while increasing the progestin levels for the last

11 days of the pack, and triphasic pills are designed to mimic the natural menstrual cycle by varying both hormones throughout the pack. Basically the progesterone in birth control pills has

an antifertility effect, and also suppresses ovulation at higher levels.

Birth control pills first appeared in the 1950s after it was discovered that progesterone blocked ovulation. The first birth control pills contained more than 20% more estrogen and more

than 10% more progesterone than pills today. This significant reduction has decreased the adverse side effects of the drugs greatly.

Currently the birth control pill has the highest efficacy rate, with a 99.9% effectiveness rate for combination regimens and a 99.5% effectiveness rate for progestin only regimens in clinical

trials. It is extremely important to take the pills on a

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Approximate Word count = 1298
Approximate Pages = 5 (250 words per page double spaced)