Birth Control Pills (BCP)
The most established form of hormonal birth control is an oral contraceptive made from synthetic hormones. The pill is considered to be 97-99% effective if used properly, and is fully reversible.
There are two types of birth control pills available: the combination pill and the mini-pill. The combination pill contains the hormones estrogen and progestin, a synthetic form of progesterone. It is taken once a day, most commonly for 21 days followed by a 7-day break. When a woman uses the combination pill, the eggs in her ovaries do not mature and she does not ovulate. Without ovulation, there is no egg available for the sperm to fertilize.
The mini-pill only contains progestin. Progestin thickens the cervical mucus, making it more difficult for sperm to pass through the cervix. It also makes the lining of the uterus less receptive to the implantation of a fertilized egg. The progestin only pill is sometimes recommended for women who have medical reasons for which they must avoid estrogen.
The minipill is taken every day – there are no on or off days with the minipill.
The theoretical efficacy of the minipill is similar to that of the combined pill (97-99%), however they are taken on a strict timing schedule. The pills must be taken within 3 hours of the same time of day every day. Therefore, real-life efficacy is dependent upon user compliance. Go to http://www.naturalbiohealth.com to learn more about this.