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Emergency contraception (EC) is a birth control measure, used after sexual intercourse to prevent pregnancy.. There are different forms of EC. Emergency contraceptive pills (ECPs), sometimes simply referred to as emergency contraceptives (ECs), or the morning-after pill, are medications intended to disrupt or delay ovulation or fertilization, which are necessary for pregnancy.
There are two different types of emergency contraceptive pills, one contains levonorgestrel and can prevent pregnancy if taken within 3 days of intercourse. The other contains ulipristal acetate and can prevent pregnancy if taken within 5 days of intercourse. This option can be used if other birth control methods fail. [5]
Life table methods are often used to study birth control effectiveness. In this role, they are an alternative to the Pearl Index.. As used in birth control studies, a decrement table calculates a separate effectiveness rate for each month of the study, as well as for a standard period of time (usually 12 months).
Here’s how to find which emergency contraception method may work best for you, with information from an Southern Illinois University doctor and a health policy professional.
Side effects can also vary by medication and, if a person has side effects with one OTC emergency contraception pill, that person may do better with another, Wider says. "So more options are ...
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The Pearl Index, also called the Pearl rate, is the most common technique used in clinical trials for reporting the effectiveness of a birth control method. It is a very approximate measure of the number of unintended pregnancies in 100 woman-years of exposure that is simple to calculate, but has a number of methodological deficiencies.
The most widely used form of oral emergency contraception is the progestin-only pill, which contains a 1.5 mg dosage of levonorgestrel. [40] Levonorgestrel-only emergency contraceptive pills are reported to have an 89% effectiveness rate if taken within the recommended 72 hours after sex. [42]