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Oral contraceptives, abbreviated OCPs, also known as birth control pills, are medications taken by mouth for the purpose of birth control. The introduction of the birth control pill ("the Pill") in 1960 revolutionized the options for contraception, sparking vibrant discussion in the scientific and social science literature and in the media.
Levonorgestrel pills, when used within 3 days, decrease the chance of pregnancy after a single episode of unprotected sex or condom failure by 70% (resulting in a pregnancy rate of 2.2%). [11] Ulipristal, when used within 5 days, decreases the chance of pregnancy by about 85% (pregnancy rate 1.4%) and is more effective than levonorgestrel.
Injections are required every 12 weeks. The rules for LAM must be followed every day. Both LAM and hormonal methods provide a reduced level of protection against pregnancy if they are occasionally used incorrectly (rarely going longer than 4–6 hours between breastfeeds, a late pill or injection, or forgetting to replace a patch or ring on time).
Pills—combined and progestogen-only—are the most common form of hormonal contraception. Worldwide, they account for 12% of contraceptive use. 21% of users of reversible contraceptives choose COCPs or POPs. Pills are especially popular in more developed countries, where they account for 25% of contraceptive use. [48]
In March 1960, the Birmingham FPA began trials of noretynodrel 2.5 mg + mestranol 50 μg, but a high pregnancy rate initially occurred when the pills accidentally contained only 36 μg of mestranol—the trials were continued with noretynodrel 5 mg + mestranol 75 μg (Conovid in the UK, Enovid 5 mg in the US). [223]
Prevention of ovulation occurs via inhibition of the hypothalamic–pituitary–gonadal axis, through progesterone and estrogen providing negative feedback to the hypothalamus and inhibiting the production of gonadotropin releasing hormone (GnRH). GnRH typically promotes the release of LH and FSH from the pituitary.
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Bedsider.org (Bedsider) is a free birth control support network for women ages 18–29. The network is operated by The National Campaign to Prevent Teen and Unplanned Pregnancy; a research based non-profit, non-partisan organization located in Washington, D.C. Launched in November 2011, its goal is to help women find the method of birth control that’s right for them and learn how to use it ...
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