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It contains ethinylestradiol, an estrogen, and etonogestrel, a progestin. [2] It is used by insertion into the vagina. [1] Pregnancy occurs in about 0.3% of women with perfect use and 9% of women with typical use. [3] Common side effects include irregular vaginal bleeding, nausea, sore breasts, vaginitis, mood changes, and headache. [4]
Different sources note different incidence of side effects. The most common side effect is breakthrough bleeding. Combined oral contraceptive pills can improve conditions such as dysmenorrhea, premenstrual syndrome, and acne, [105] reduce symptoms of endometriosis and polycystic ovary syndrome, and decrease the risk of anemia. [106]
Although progestins have differing effects on aspects of cardiovascular risk, in general, those more similar to progesterone have been associated with a lower impact than the more androgenic progestins on the beneficial effects of concomitant estrogen therapy.
The FDA first approved the oral contraceptive in 1960. The first oral contraceptive contained 100 to 175 μg of estrogen and 10 mg of progesterone. However, at these levels significant adverse effects were seen and modern preparations contain lower levels of 30 to 50 μg of estrogen and 0.3 to 1 mg of progesterone. [49]
The most common side effects of the norgestrel include irregular bleeding, headaches, dizziness, nausea, increased appetite, abdominal pain, cramps, or bloating. [2] Norgestrel is a progestin, or a synthetic progestogen, and hence is an agonist of the progesterone receptor, the biological target of progestogens like progesterone. [6]
Side effects of the combination of an estrogen and norgestimate include menstrual irregularities, headaches, nausea, abdominal pain, breast tenderness, mood changes, and others. [3] [4] Norgestimate is a progestin, or a synthetic progestogen, and hence is an agonist of the progesterone receptor, the biological target of progestogens like ...