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Mechanism of action -COCP contains ethinyloestradiol ( EE ) , oestradiol valerate , or oestradiol and one of a range of progestogensEthinyloestradiol is the most common oestrogen Works on the hypothalamic-pituitary-ovarian axis to suppress the synthesis and secretion of FSH and the mid-cycle LH surge - thus inhibiting ovulation progestin also makes implantation less likely as it causes thickening of cervical mucus , a decrease in tubal motility and the inhibition of endometrial proliferation Very effective over 99 % if used correctlyand easily reversible
Types -Monophasic - every pill has same levels of oestrogen and progesterone throughout the cycleâ—‹ most common typesâ—‹ Microgynon is an example Phasic pills - levels of oestrogen and progesterone vary through the cycle.â—‹ these can be biphasic , triphasic or quadraphasicâ—‹ important that these are taken in correct orderPhasic pills are thought to reduce the incidence of side effects and complications related to oral contraception. The idea is to reduce the hormone levels to the minimum amount necessary
Advantages -Non-invasive and more effective than barrier methods Can regulate periods- make them regular , lighter and less painful Can improve acne in some women Help with symptoms of premenstrual syndrome Reduce cancer risk ovarian , endometrial...
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