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MDCalc was founded by two emergency physicians, Graham Walker, MD, and Joseph Habboushe, MD, MBA, [5] and provides over 500 medical calculators and other clinical decision-support tools. [6] The MDCalc.com website was launched in 2005. [5] In 2016, MDCalc launched an iOS app, [7] followed by an Android app in 2017. [8]
There is a case report of progesterone misuse with an oral dosage of 6,400 mg per day. [137] Administration of as much as 500 mg progesterone by intravenous infusion in humans was uneventful in terms of toxicity, but did induce deep sleep, though the individuals were still able to be awakened with sufficient stimulation. [119] [17] [120] [121]
Progesterone is used as part of hormone replacement therapy in people who have low progesterone levels, and for other reasons. For purposes of comparison with normal physiological circumstances, luteal phase levels of progesterone are 4 to 30 ng/mL, while follicular phase levels of progesterone are 0.02 to 0.9 ng/mL, menopausal levels are 0.03 to 0.3 ng/mL, and levels of progesterone in men ...
For comparison to MPA, the dosage of progesterone required to inhibit ovulation is 300 mg/day, whereas that of the 19-nortestosterone derivatives norethisterone and norethisterone acetate is only 0.4 to 0.5 mg/day.
Megestrol acetate alone does not inhibit ovulation at a dosage of 0.5 mg/day, nor does it fully inhibit ovulation at a dosage of 0.7 mg/day or even at a dosage of 5 mg/day. [ 7 ] [ 41 ] [ 108 ] The combination of 2 to 5 mg/day megestrol acetate and 100 μg/day mestranol has been found to consistently inhibit ovulation, whereas either medication ...
Progesterone is a progestogen, or an agonist of the nuclear progesterone receptors (PRs), the PR-A, PR-B, and PR-C. [1] In one study, progesterone showed EC 50 Tooltip half-maximal effective concentration values of 7.7 nM for the human PR-A and 8.0 nM for the human PR-B. [5] In addition to the PRs, progesterone is an agonist of the membrane progesterone receptors (mPRs), including the mPRα ...
Progesterone and some of its metabolites, such as 5β-dihydroprogesterone, are agonists of the pregnane X receptor (PXR), [30] albeit weakly so (EC 50 >10 μM). [31] In accordance, progesterone induces several hepatic cytochrome P450 enzymes, [32] such as CYP3A4, [33] [34] especially during pregnancy when concentrations are much higher than ...
Progestogen-only pills," "Progestin-only pills," and "Progesterone-only pills" are terms each referring to the same class of synthetic hormone medications. The phrase "Progestogen-only pill" is used by the World Health Organization and much of the international medical community. [ 7 ]