General concepts :• Taken after unprotected sexual intercourse or barrier contraceptive failure.• contain higher doses of the same hormones (estrogens, progestins, or both) found in regular combined oral contraceptive pills.• ECPs are most effective when used shortly after intercourse.• i.e should be taken within 72 – 120 hr after the intercourse.
General concepts :• combined contraceptives is shown to be less effective and less tolerated than the progestin-only method.• Emergency contraceptive pills (ECPs) are not to be confused with mifepristone and Misoprostol , which are used as an "abortion pills“.
Types of ECPs(1) The progestin-only method uses the progestin levonorgestrel : called : plan B in a dose of 1.5 mg. either as two 750 μg doses 12 hours apart, or more recently as a single dose. to be taken within 72 hr. 75 % effective.
Note : the strength of levonorgestril in minipills is usually 30 micgm..and in combined pills is 150 micgm. Thus : taking 10 tabs from combined pills that containing 150 micgm will be equal to 1500 micgm = 1.5 mg = plan b single ECPs.
(2) Ulipristal acetate :was approved as an ECP in Europe in early 2009 and in the US in August 2010. called : ELLA in dose 30 mg. It works for up to 120 hours after intercourse. is in the class of progestins. It has shown to prevent about 60% of expected pregnancies.
(3) Intrauterine device (IUD) for emergency contraception : Insertion of an IUD is more effective than use of Emergency Contraceptive Pills. 99.9 % effective if used within week after intercourse.