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Estrogens, Progestins, and Specific Estrogen
Estrogens, Progestins, and Specific Estrogen

... Oral Contraception Oral contraceptives are among the most effective forms of birth control (Table 61.1). The most widely used type of oral contraceptive in the United States today is the combination preparation, that is, a combination of estrogen and progestin (Table 61.2). Users take a tablet daily ...
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... Taking medicines that contain the female hormones estrogen and progestin to treat the symptoms of menopause has become complex in the wake of several important studies released between 2002 and 2005. The studies show that the hormones increase the risk of heart disease, stroke, and some cancers (not ...
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... brain in the skull base in an area called the pituitary fossa, or sella turcica. Weighing less than one gram, the pituitary gland is often called the "master gland" since it controls the secretion of hormones.  Hormones have a dramatic and broad range of effects on metabolism, growth and maturation ...
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Classification of Hormones Lecture 1
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Hormonal contraception

Hormonal contraception refers to birth control methods that act on the endocrine system. Almost all methods are composed of steroid hormones, although in India one selective estrogen receptor modulator is marketed as a contraceptive. The original hormonal method—the combined oral contraceptive pill—was first marketed as a contraceptive in 1960. In the ensuing decades many other delivery methods have been developed, although the oral and injectable methods are by far the most popular. Altogether, 18% of the world's contraceptive users rely on hormonal methods. Hormonal contraception is highly effective: when taken on the prescribed schedule, users of steroid hormone methods experience pregnancy rates of less than 1% per year. Perfect-use pregnancy rates for most hormonal contraceptives are usually around the 0.3% rate or less. Currently available methods can only be used by women; the development of a male hormonal contraceptive is an active research area.There are two main types of hormonal contraceptive formulations: combined methods which contain both an estrogen and a progestin, and progestogen-only methods which contain only progesterone or one of its synthetic analogues (progestins). Combined methods work by suppressing ovulation and thickening cervical mucus; while progestogen-only methods reduce the frequency of ovulation, most of them rely more heavily on changes in cervical mucus. The incidence of certain side effects is different for the different formulations: for example, breakthrough bleeding is much more common with progestogen-only methods. Certain serious complications occasionally caused by estrogen-containing contraceptives are not believed to be caused by progestogen-only formulations: deep vein thrombosis is one example of this.
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