Progesterone (medication)
Progesterone is a medication and naturally occurring steroid hormone.[9] It is a progestogen and neurosteroid is used mainly in hormone replacement therapy (HRT) for menopause,[9] hypogonadism, and in transgender women. Progesterone can be taken by mouth, in through the vagina, by injection into muscle, or through the use of an implant that is placed under the skin, among other routes.[9]
Progesterone was first isolated in pure form in 1934.[10][11] It first became available as a medication in 1934.[12][13] Micronized progesterone, which allowed progesterone to be taken by mouth, was not introduced until 1980.[13][14][15] A large number of synthetic progestogens, or progestins, have been developed from progesterone and are used as medications as well. Progesterone is on the WHO Model List of Essential Medicines, the most important medications needed in a basic health system.[16]
Medical uses
The use of progesterone and its analogues have many medical applications, both to address acute situations and to address the long-term decline of natural progesterone levels. Because of the poor bioavailability of progesterone when taken by mouth, many synthetic progestins have been designed with improved bioavailability by mouth and have been used long before progesterone formulations became available.[17]
Hormone replacement therapy
Transgender
Progesterone is used as a component of hormone replacement therapy for transgender women.[18]
Prevention of preterm birth
Vaginally dosed progesterone is being investigated as potentially beneficial in preventing preterm birth in women at risk for preterm birth. The initial study by Fonseca suggested that vaginal progesterone could prevent preterm birth in women with a history of preterm birth.[19] According to a recent study, women with a short cervix that received hormonal treatment with a progesterone gel had their risk of prematurely giving birth reduced. The hormone treatment was administered vaginally every day during the second half of a pregnancy.[20] A subsequent and larger study showed that vaginal progesterone was no better than placebo in preventing recurrent preterm birth in women with a history of a previous preterm birth,[21] but a planned secondary analysis of the data in this trial showed that women with a short cervix at baseline in the trial had benefit in two ways: a reduction in births less than 32 weeks and a reduction in both the frequency and the time their babies were in intensive care.[22] In another trial, vaginal progesterone was shown to be better than placebo in reducing preterm birth prior to 34 weeks in women with an extremely short cervix at baseline.[23] An editorial by Roberto Romero discusses the role of sonographic cervical length in identifying patients who may benefit from progesterone treatment.[24] A meta-analysis published in 2011 found that vaginal progesterone cut the risk of premature births by 42 percent in women with short cervixes.[25] The meta-analysis, which pooled published results of five large clinical trials, also found that the treatment cut the rate of breathing problems and reduced the need for placing a baby on a ventilator.[26]
Fertility indications
- Progesterone is used for luteal support in assisted reproductive technology (ART) cycles such as in-vitro fertilization (IVF).
- Progesterone is used to prepare uterine lining in infertility therapy and to support early pregnancy.
Gynecological disorders
- Progesterone is used to control persistent anovulatory bleeding.
- Progesterone is used in non-pregnant women with a delayed menstruation of one or more weeks, in order to allow the thickened endometrial lining to slough off. This process is termed a progesterone withdrawal bleed. The progesterone is taken orally for a short time (usually one week), after which the progesterone is discontinued and bleeding should occur.
Other uses
- Progesterone can be used to treat catamenial epilepsy by supplementation during certain periods of the menstrual cycle.[27]
- Progesterone is being investigated as potentially beneficial in treating multiple sclerosis, since the characteristic deterioration of nerve myelin insulation halts during pregnancy, when progesterone levels are raised; deterioration commences again when the levels drop.
Medical formulations
Progesterone is marketed under a large number of different brand names throughout the world.[28] Progesterone was approved by the United States Food and Drug Administration as vaginal gel on July 31, 1997,[29] a capsule to be taken by mouth on May 14, 1998[30] in an injection form on April 25, 2001[31] and as a vaginal insert on June 21, 2007.[32] Progesterone, when taken by mouth, has very poor pharmacokinetics, including low bioavailability (only about 10–15% reaches the bloodstream)[33] and a half-life of only about 5 minutes, unless it is micronized.[5][34] As such, it is sold in the form of oil-filled capsules containing micronized progesterone for oral use, termed oral micronized progesterone (OMP).[5][28] Progesterone is also available in the forms of vaginal or rectal suppositories or pessaries,[28] transdermally-administered gels or creams,[28][35] or via intramuscular or subcutaneous injection of a vegetable oil solution.[5][28][36]
Transdermal products made with progesterone USP (i.e., "natural progesterone") do not require a prescription. Some of these products also contain "wild yam extract" derived from Dioscorea villosa, but there is no evidence that the human body can convert its active ingredient (diosgenin, the plant steroid that is chemically converted to produce progesterone industrially)[37] into progesterone.[38][39]
Interactions
There are several notable drug interactions with progesterone. Certain selective serotonin reuptake inhibitors (SSRIs) may increase the GABAA receptor-related central depressant effects of progesterone by enhancing its conversion into 5α-dihydroprogesterone and allopregnanolone via activation of 3α-HSD.[40] Progesterone potentiates the sedative effects of benzodiazepines and ethanol.[41] Notably, there is a case report of progesterone abuse alone with very high doses.[42] 5α-Reductase inhibitors such as finasteride and dutasteride, as well as inhibitors of 3α-HSD such as medroxyprogesterone acetate, inhibit the conversion of progesterone into its inhibitory neurosteroid metabolites, and for this reason, may have the potential to block or reduce its sedative effects.[43][44][45]
Progesterone is a weak but significant agonist of the pregnane X receptor (PXR), and has been found to induce several hepatic cytochrome P450 enzymes, such as CYP3A4, especially when concentrations are high, such as with pregnancy range levels.[46][47][48][49] As such, progesterone may have the potential to accelerate the clearance of various drugs, especially with oral administration (which results in supraphysiological levels of progesterone in the liver), as well as with the high concentrations achieved with sufficient injection dosages.
Pharmacology
Progesterone is a progestogen, or an agonist of the nuclear progesterone receptors (PRs), the PR-A and the PR-B.[9] It is also an agonist of the membrane progesterone receptors (mPRs), such as the mPRα, mPRβ, and mPRγ.[50][51] Progesterone is a potent antimineralocorticoid[52][53] as well as a very weak glucocorticoid as well.[54][55] In addition to interactions with nuclear receptors, progesterone is a neurosteroid;[56] it is an antagonist of the σ1 receptor,[57][58] a negative allosteric modulator of the nicotinic acetylcholine receptor,[56] and, through active metabolites such as allopregnanolone, a potent positive allosteric modulator of the GABAA receptor.[59]
Pharmacokinetics
Oral administration
The route of administration impacts the effects of progesterone. OMP has a wide inter-individual variability in absorption and bioavailability. In contrast, progestins are rapidly absorbed with a longer half-life than progesterone and maintain stable levels in the blood.[60] The absorption and bioavailability of OMP is increased approximately two-fold when it is taken with food.[61] Progesterone has a relatively short half-life in the body. As such, OMP is usually prescribed for twice or thrice-daily administration or once-daily administration when taken by injection.[5] Via the oral route, peak concentrations are seen about 2–3 hours after ingestion, and the half-life is about 16–18 hours.[5] Significantly elevated serum levels of progesterone are maintained for about 12 hours, and levels do not return to baseline until at least 24 hours have passed.[5] OMP is prescribed in divided doses .[62]
Neurosteroids metabolites
A portion of progesterone is converted into 5α-dihydroprogesterone and allopregnanolone (a conversion that is catalyzed by the enzymes 5α-reductase and 3α-hydroxysteroid dehydrogenase (3α-HSD) and occurs in the liver, reproductive endocrine tissues, skin, and the brain),[63] which are neurosteroids and potent potentiators of GABAA receptors.[64][65] It is for this reason that common reported side effects of progesterone include dizziness, drowsiness or sedation, sleepiness, and fatigue, especially at high doses.[64][65] As a result, some physicians may instruct their patients to take their progesterone before bed.[64] Both oral and intramuscularly injected progesterone produce sedative effects, indicating that first-pass metabolism in the liver is not essential for the conversion to take place.[66][67][68] Moreover, the sedative effects occur in both men and women, indicating a lack of sex-specificity of the effects.[66]
Vaginal administration
With vaginal and rectal administration, a 100 mg dose of progesterone results in peak levels at 4 hours and 8 hours after dosing, respectively, with the levels achieved being in the serum luteal phase range.[69] Following peak serum concentrations, there is a gradual decline in plasma levels, and after 24 hours, serum levels typical of the follicular phase are reached.[69]
Transdermal administration
Transdermal progesterone is about 5–7 times stronger than oral progesterone.[33] This is due to the fact transdermal administration bypasses first-pass metabolism.[33] As such, 20–30 mg/day transdermal progesterone is equivalent to about 100–200 mg/day oral progesterone.[33] Some researchers have reported that absorption of progesterone via the transdermal route is poor, impractical, and unsubstantiated, however they may have been measuring serum blood or urine levels.[70][71] Other studies have shown that transdermal absorption of progesterone cream is much higher when capillary blood or saliva testing is used.[72]
Intramuscular injection
With intramuscular injection of 10 mg progesterone suspended in vegetable oil, maximum plasma concentrations (Cmax) are reached at approximately 8 hours after administration, and serum levels remain above baseline for about 24 hours.[36] Doses of 10 mg, 25 mg, and 50 mg via intramuscular injection result in mean maximum serum concentrations of 7 ng/mL, 28 ng/mL, and 50 ng/mL, respectively.[36] With intramuscular injection, a dose of 25 mg results in normal luteal phase serum levels of progesterone within 8 hours, and a 100 mg dose produces mid-pregnancy levels.[69] At these doses, serum levels of progesterone remain elevated above baseline for at least 48 hours,[69] with a half-life of about 22 hours.[6]
Due to the high concentrations achieved, progesterone by intramuscular injection at the usual clinical dose range is able to suppress gonadotropin secretion from the pituitary gland, demonstrating antigonadotropic efficacy (and therefore suppression of gonadal sex steroid production).[36]
Intramuscular progesterone irritates tissues and is associated with injection site reactions such as changes in skin color, pain, redness, transient indurations (due to inflammation), ecchymosis (bruising/discoloration), and others.[73]
Microsphere formulation
An intramuscular suspension formulation of progesterone contained in microspheres is marketed under the brand name ProSphere in Mexico.[73][74][75] It is far longer-lasting than regular intramuscular progesterone and is administered once weekly or monthly, depending on the indication.[73]
Subcutaneous injection
Progesterone can also be administered alternatively via subcutaneous injection, with the aqueous formulation Prolutex in Europe being intended specifically for once-daily administration by this route.[6][76][77] This formulation is rapidly absorbed and has been found to result in higher serum peak progesterone levels relative to intramuscular oil formulations.[77] In addition, subcutaneous injection of progesterone is considered to be easier, safer (less risk of injection site reactions), and less painful relative to intramuscular injection.[77] The terminal half-life of this formulation is 13 to 18 hours, which is similar to the terminal half-lives of OMP and intramuscular progesterone.[6]
Normal progesterone levels
For comparative purposes, mid-luteal serum levels of progesterone are above 5–9 ng/ml,[69] plasma levels in the first 4 to 8 weeks of pregnancy are 25–75 ng/ml,[10] and serum levels at term are typically around 200 ng/ml.[10] Production of progesterone in the body in late pregnancy is approximately 250 mg per day, 90% of which reaches maternal circulation.[78]
Chemistry
Progesterone is a pregnane (C21) steroid and is also known as pregn-4-ene-3,20-dione. It has a double bond (4-ene) between the C4 and C5 positions and two ketone groups (3,20-dione), one at the C3 position and the other at the C20 position.
Like all unconjugated steroid hormones, progesterone is lipophilic and hydrophobic.
Derivatives
A large number of progestins (synthetic progestogens) have been derived from progesterone. They can be categorized into several structural groups, including derivatives of retroprogesterone, 17α-hydroxyprogesterone, 17α-methylprogesterone, and 19-norprogesterone, with a respective example from each group including dydrogesterone, medroxyprogesterone acetate, medrogestone, and promegestone. Quingestrone is a rare example that does not belong to any of these groups.
History
The hormonal action of progesterone was discovered in 1929.[10][11][79] In 1934, pure crystalline progesterone was isolated in 1934 and its chemical structure was determined.[10][11] Later that year, chemical synthesis of progesterone was accomplished.[11][80] Shortly following its chemical synthesis, progesterone began being tested clinically in women.[11] In 1934, Schering introduced progesterone as a pharmaceutical drug under the brand name Proluton.[12][13] It was administered by intramuscular injection because it progesterone rapidly inactivated after being taken by mouth and when used by mouth required very high doses to produce an effect.[14][81]
It was not until almost half a century later that a non-injected formulation of progesterone was marketed.[82] Micronization, similarly to the case of estradiol, allowed progesterone to be absorbed effectively via other routes of administration, but the micronization process was difficult for manufacturers for many years.[83] Oral micronized progesterone was finally marketed in France under the brand name Utrogestan in 1980,[13][14][15] and this was followed by the introduction of oral micronized progesterone in the United States under the brand name Prometrium in 1998.[83] In the early 1990s, vaginal micronized progesterone (brand names Crinone, Utrogestan, Endometrin)[84] was also marketed.[82]
Society and culture
Generic name
Progesterone is the generic name of progesterone in English and the INN, USAN, USP,[85] BAN, DCIT, and JAN of the drug, while progestérone is the name of progesterone in French and the DCF.[86][87][88][89] It is also formally referred to as progesteronum in Latin, progesterona in Spanish and Portuguese, and progesteron in German.[86]
Brand names
Progesterone is marketed under a large number of brand names throughout the world.[88][86] Examples of major brand names in which progesterone has been marketed include Crinone, Crinone 8%, Cyclogest, Endometrin, Geslutin, Gesterol, Gestone, Luteinol, Lutigest, Lutinus, Progeffik, Progelan, Progendo, Progest, Progestaject, Progestan, Progestin, Progestogel, Prolutex, Proluton, Prometrium, Prontogest, Utrogest, and Utrogestan.[88][86]
Availability
United States
As of November 2016, progesterone is available in the United States in the following formulations:[90]
- Oral capsules: Prometrium – 100 mg, 200 mg, 300 mg
- Vaginal gels: Crinone, Progestasert, Prometrium – 4%, 8%
- Vaginal inserts: Endometrin – 100 mg
- Oil for intramuscular injection: Progesterone – 50 mg/mL
Discontinued:
- Oil for intramuscular injection: Progesterone – 25 mg/mL
- Intrauterine device: Progestasert – 38 mg/device
A combination formulation of micronized progesterone and estradiol in oil-filled oral capsules (TX-001HR) is currently under development in the U.S. for the treatment of menopausal symptoms and endometrial hyperplasia, though it has yet to be approved or introduced.[91][92]
Progesterone is also available in custom preparations from compounding pharmacies in the U.S.[93] This includes subcutaneous pellet implants.[94]
Other countries
Progesterone is widely available in countries throughout the world in a variety of formulations. For an extensive list of countries that it is marketed in along with the associated brand names, see here.
Research
Brain damage
Studies as far back as 1987 show that female sex hormones have an effect on the recovery of traumatic brain injury.[95] In these studies, it was first observed that pseudopregnant female rats had reduced edema after traumatic brain injury. Recent clinical trials have shown that among patients that have suffered moderate traumatic brain injury, those that have been treated with progesterone are more likely to have a better outcome than those who have not.[96] A number of additional animal studies have confirmed that progesterone has neuroprotective effects when administered shortly after traumatic brain injury.[97] Encouraging results have also been reported in human clinical trials.[98][99]
Combination treatments
Vitamin D and progesterone separately have neuroprotective effects after traumatic brain injury, but when combined their effects are synergistic.[100] When used at their optimal respective concentrations, the two combined have been shown to reduce cell death more than when alone.
One study looks at a combination of progesterone with estrogen. Both progesterone and estrogen are known to have antioxidant-like qualities and are shown to reduce edema without injuring the blood-brain barrier. In this study, when the two hormones are administered alone it does reduce edema, but the combination of the two increases the water content, thereby increasing edema.[101]
Clinical trials
The clinical trials for progesterone as a treatment for traumatic brain injury have only recently begun. ProTECT, a phase II trial conducted in Atlanta at Grady Memorial Hospital in 2007, the first to show that progesterone reduces edema in humans. Since then, trials have moved on to phase III. The National Institute of Health began conducting a nationwide phase III trial in 2011 led by Emory University.[96] A global phase III initiative called SyNAPSe®, initiated in June 2010, is run by a U.S.-based private pharmaceutical company, BHR Pharma, and is being conducted in the United States, Argentina, Europe, Israel and Asia.[102][103] Approximately 1,200 patients with severe (Glasgow Coma Scale scores of 3-8), closed-head TBI will be enrolled in the study at nearly 150 medical centers.
Addiction
To examine the effects of progesterone on nicotine addiction, participants in one study were either treated orally with a progesterone treatment, or treated with a placebo. When treated with progesterone, participants exhibited enhanced suppression of smoking urges, reported higher ratings of “bad effects” from IV nicotine, and reported lower ratings of “drug liking”. These results suggest that progesterone not only alters the subjective effects of nicotine, but reduces the urge to smoke cigarettes.[104]
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