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Birth control pill Birth control pill. bender ball Oral contraceptives, better known as the contraceptive pill or just the pill (in Chile are known as birth control pills or tablets only), are hormones delivered orally aimed at altering the menstrual cycle to prevent ovulation and, Thus, the fertilization of an egg. Oral contraceptives are chemicals that inhibit the fertility and act on the hormonal system. Oral contraceptives have been on the market since 1960 and enjoyed great popularity. Millions of women use them worldwide, but the prevalence of use varies: one quarter of women of childbearing age in the UK take it, but only 1 in Japan. Male oral contraceptives are still in development in 2006. The pill may be prescribed by physicians or midwives (s), side effects and not all women have the necessary characteristics to make it.They usually go in tablets of 28 pills, 21 of which contain doses of hormones and the other 7 are placebo. The day after finishing a tablet should start a new one. Became legal in Spain on 7 October 1978 after 20 years as they did in other European countries.