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At low doses, levonorgestrel is used in monophasic and triphasic formulations of combined oral contraceptive pills, with available monophasic doses ranging from 100 to 250 μg, and triphasic doses of 50 μg, 75 μg, and 125 μg. [23] It is combined with the estrogen ethinylestradiol in these formulations. [23]
With bi- and tri-phasic pills, skipping the placebo week results in a sudden change in hormone levels, which may cause irregular spotting or flow. (Monophasic pills offer the same dose of estrogen and progestogen whereas multiphasic pills have varying doses from day to day; see formulations for details.) [citation needed]
These differ in the amount of estrogen given, and whether they are monophasic (the same dose of estrogen and progestogen during each of the 21 days) or multiphasic (varying doses). The introduction of extended-cycle monophasic pills (i.e. Seasonale) has shown that the withdrawal bleeding intervals can be decreased.
It is available as a generic medication. [7] It is marketed under many brand names. [1] In 2022, it was the 128th most commonly prescribed medication in the United States, with more than 4 million prescriptions. [8] [9]
A package insert from 1970, with Ovrette brand contraception pills A package insert is a document included in the package of a medication that provides information about that drug and its use. For prescription medications , the insert is technical , providing information for medical professionals about how to prescribe the drug.
Combined oral contraceptive pills are a type of oral medication that were originally designed to be taken every day at the same time of day in order to prevent pregnancy. [26] [37] There are many different formulations or brands, but the average pack is designed to be taken over a 28-day period (also known as a cycle).
CPA/EE-containing birth control pills were developed by 1975 [20] [21] and were first introduced for medical use in 1978. [22] They originally contained 50 μg EE (Diane); subsequently, the EE dosage was decreased to 35 μg in a new "low-dose" preparation in 1986 (Diane-35).
[48] [51] [49] About 5 to 10% of women experience negative mood changes with combined birth control pills, and about 5% of women discontinue birth control pills due to such changes. [ 52 ] [ 48 ] A study of about 4,000 women found that progestogen-only birth control with depot medroxyprogesterone acetate had an incidence of depression of 1.5% ...