Estradiol undecylate

Last updated
Estradiol undecylate
Estradiol undecylate.svg
Estradiol undecylate molecule ball.png
Clinical data
Pronunciation /ˌɛstrəˈdaɪɒlənˈdɛsɪleɪt/
ES-trə-DY-ol un-DESS-il-ayt
Trade names Delestrec, Progynon Depot 100, others
Other namesEU; E2U; Estradiol undecanoate; Estradiol unducelate; RS-1047; SQ-9993
Routes of
administration 		Intramuscular injection [1]
Drug class Estrogen; Estrogen ester
ATC code
Legal status
Legal status
  • In general: ℞ (Prescription only)
Pharmacokinetic data
Bioavailability IM injection: High
Protein binding Estradiol: ~98% (to albumin and SHBG Tooltip sex hormone-binding globulin) [2] [3]
Metabolism Cleavage via esterases in the liver, blood, and tissues [4] [5]
Metabolites Estradiol, undecanoic acid, estradiol metabolites [4] [5]
Elimination half-life Unknown
Duration of action IM injection:
• 10–12.5 mg: 1–2 months [6] [7]
• 25–50 mg: 2–4 months [8]
Excretion Urine
Identifiers
  • [(8R,9S,13S,14S,17S)-3-hydroxy-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-17-yl] undecanoate
CAS Number
PubChem CID
ChemSpider
UNII
KEGG
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard 100.020.616 OOjs UI icon edit-ltr-progressive.svg
Chemical and physical data
Formula C29H44O3
Molar mass 440.668 g·mol−1
3D model (JSmol)
  • CCCCCCCCCCC(=O)O[C@H]1CC[C@@H]2[C@@]1(CC[C@H]3[C@H]2CCC4=C3C=CC(=C4)O)C
  • InChI=1S/C29H44O3/c1-3-4-5-6-7-8-9-10-11-28(31)32-27-17-16-26-25-14-12-21-20-22(30)13-15-23(21)24(25)18-19-29(26,27)2/h13,15,20,24-27,30H,3-12,14,16-19H2,1-2H3/t24-,25-,26+,27+,29+/m1/s1
  • Key:TXHUMRBWIWWBGW-GVGNIZHQSA-N

Estradiol undecylate (EU, EUn, E2U), also known as estradiol undecanoate and formerly sold under the brand names Delestrec and Progynon Depot 100 among others, is an estrogen medication which has been used in the treatment of prostate cancer in men. [9] [10] [11] [12] [1] It has also been used as a part of hormone therapy for transgender women. [13] [14] [15] Although estradiol undecylate has been used in the past, it was discontinued. [11] [16] [ failed verification ] The medication has been given by injection into muscle usually once a month. [1] [17] [12]

Contents

Side effects of estradiol undecylate in men may include breast tenderness, breast development, feminization, sexual dysfunction, infertility, fluid retention, and cardiovascular issues. [17] Estradiol undecylate is an estrogen and hence is an agonist of the estrogen receptor, the biological target of estrogens like estradiol. [5] [4] It is an estrogen ester and a very long-lasting prodrug of estradiol in the body. [4] [5] Because of this, it is considered to be a natural and bioidentical form of estrogen. [4] [18] [19] An injection of estradiol undecylate has a duration of about 1 to 4 months. [7] [8] [6] [20]

Estradiol undecylate was first described in 1953 and was introduced for medical use by 1956. [7] [21] [8] [22] It remained in use as late as the 2000s before being discontinued. [23] [11] [24] Estradiol undecylate was marketed in Europe, but does not seem to have ever been available in the United States. [14] [25] [11] It was used for many years as a parenteral estrogen to treat prostate cancer in men, although it was not employed as often as polyestradiol phosphate. [12]

Medical uses

Estradiol undecylate has been used as a form of high-dose estrogen therapy to treat prostate cancer, but has since largely been superseded for this indication by newer agents with fewer adverse effects (e.g., gynecomastia and cardiovascular complications) like GnRH analogues and nonsteroidal antiandrogens. [1] [26] It has been assessed for this purpose in a number of clinical studies. [27] [28] [29] [30] [31] It has been used at a dosage of 100 mg every 3 to 4 weeks (or once a month) by intramuscular injection for this indication. [17] [32]

Estradiol undecylate has been used to suppress sex drive in sex offenders. [33] It has been used for this indication at a dosage of 50 to 100 mg by intramuscular injection once every 3 to 4 weeks. [33]

Estradiol undecylate has also been used to treat breast cancer in women. [34] It has been used in menopausal hormone therapy as well, for instance in the treatment of hot flashes and other menopausal symptoms. [8] Along with estradiol valerate, estradiol cypionate, and estradiol benzoate, estradiol undecylate has been used as an intramuscular estrogen in feminizing hormone therapy for transgender women. [13] [14] [15] It has been used at doses of 100 to as much as 800 mg per month by intramuscular injection for this purpose. [14] [15] [13] [35] [36] [37]

Estrogen dosages for prostate cancer
Route/formEstrogenDosage
Oral Estradiol 1–2 mg 3x/day
Conjugated estrogens 1.25–2.5 mg 3x/day
Ethinylestradiol 0.15–3 mg/day
Ethinylestradiol sulfonate 1–2 mg 1x/week
Diethylstilbestrol 1–3 mg/day
Dienestrol 5 mg/day
Hexestrol 5 mg/day
Fosfestrol 100–480 mg 1–3x/day
Chlorotrianisene 12–48 mg/day
Quadrosilan 900 mg/day
Estramustine phosphate 140–1400 mg/day
Transdermal patch Estradiol 2–6x 100 μg/day
Scrotal: 1x 100 μg/day
IM Tooltip Intramuscular or SC injection Estradiol benzoate 1.66 mg 3x/week
Estradiol dipropionate 5 mg 1x/week
Estradiol valerate 10–40 mg 1x/1–2 weeks
Estradiol undecylate100 mg 1x/4 weeks
Polyestradiol phosphate Alone: 160–320 mg 1x/4 weeks
With oral EE: 40–80 mg 1x/4 weeks
Estrone 2–4 mg 2–3x/week
IV injection Fosfestrol 300–1200 mg 1–7x/week
Estramustine phosphate 240–450 mg/day
Note: Dosages are not necessarily equivalent. Sources: See template.

Available forms

Estradiol undecylate was available as an oil solution for intramuscular injection provided in ampoules at a concentration of 100 mg/mL. [23] [38]

Contraindications

Contraindications of estrogens include coagulation problems, cardiovascular diseases, liver disease, and certain hormone-sensitive cancers such as breast cancer and endometrial cancer, among others. [39] [40] [41] [42]

Side effects

Estradiol undecylate and its side effects have been evaluated for the treatment of advanced prostate cancer in a phase III international multicenter randomized controlled trial headed by Jacobi and colleagues of the Department of Urology, University of Mainz. [17] [43] [44] [45] [46] [28] [47] The study consisted of 191 patients from 12 treatment centers, who were treated for 6 months with intramuscular injections of either 100 mg/month estradiol undecylate (96 men) or 300 mg/week cyproterone acetate (95 men). [43] [45] [46] [28] [47] [48] [49] Findings for a subgroup of 42 men at the University of Mainz center were initially reported in 1978 and 1980. [50] [17] [28] [47] These men were age 51 to 84 years (mean 68 years), and men with pre-existing cardiovascular disease were excluded. [12] [17] [51] A considerable incidence of cardiovascular complications was reported for the estradiol undecylate group (76%; 16/21 incidence total); there was a 67% (14/21) incidence of cardiovascular morbidity and a 9.5% (2/21) incidence of cardiovascular mortality. [12] [17] [51] The cardiovascular morbidity in this group included peripheral edema and superficial thrombophlebitis (38%; 8/21), coronary heart disease (24%; 5/21), and a deep vein thrombosis (4.8%; 1/21), while the cardiovascular mortality included a myocardial infarction (4.8%; 1/21) and a pulmonary embolism (4.8%; 1/21). [17] [51] Eight of the cases of cardiovascular complications in the estradiol undecylate group, including the two deaths, were regarded as "severe". [51] [52] Conversely, no incidence of cardiovascular toxicity occurred in the cyproterone acetate comparison group (0%; 0/21). [12] [17] [51] Other side effects of estradiol undecylate included gynecomastia (100%; 21/21) and erectile dysfunction (90%; 19/21). [17] The cardiovascular complications with estradiol undecylate in this relatively small study are in contrast to large and high-quality clinical studies of high-dose polyestradiol phosphate and transdermal estradiol for prostate cancer, in which minimal to no cardiovascular toxicity has been observed. [53] [54] [55] [56] [57]

An expanded report of 191 patients, which included the 42 patients from the University of Mainz center plus an additional 149 patients from 11 other centers, was published in 1982. [43] [49] The antitumor effectiveness of estradiol undecylate and cyproterone acetate in this study was equivalent. [43] [45] [58] [46] [28] [47] The rates of improvement, no response, and deterioration were 52%, 41%, and 7% in the estradiol undecylate group and 48%, 44%, and 8% in the cyproterone acetate group, respectively. [43] [46] However, the incidence of a selection of specific side effects, including gynecomastia, breast tenderness, and edema, was significantly lower in the cyproterone acetate group than in the estradiol undecylate group (37% vs. 94%, respectively). [43] [45] [46] [59] Gynecomastia specifically occurred in 13% (12/96) of the patients in the cyproterone acetate group and 77% (73/95) of the patients in the estradiol undecylate group. [43] [45] Erectile dysfunction occurred in "essentially all" patients in both groups. [49] Leg edema occurred in 18% (17/95) of the estradiol undecylate group and 4.2% (4/96) of the cyproterone acetate group, while the incidences of superficial thrombophlebitis and coronary heart disease both were not described. [43] The incidence of thrombosis was 4.2% (4/95) in the estradiol undecylate group and 5.3% (5/96) in the cyproterone acetate group. [43] [48] [49] There were five deaths in total, three in the estradiol undecylate group and two in the cyproterone acetate group. [43] Two of the deaths in each of the treatment groups were due to cardiovascular events, while the remaining death in the estradiol undecylate group was due to unknown causes. [43] [46] [49] The similar rate of cardiovascular complications besides edema between estradiol undecylate and cyproterone acetate that was observed is in contrast to the initial 42-patient report and to findings with other estrogens, such as diethylstilbestrol and estramustine phosphate, which have been shown to possess significantly higher cardiovascular toxicity than cyproterone acetate. [45] On the basis of the expanded study, the researchers concluded that cyproterone acetate was an "acceptable alternative" to estrogen therapy with estradiol undecylate, but with a "considerably more favorable" side-effect profile. [46]

After the completion of the initial expanded study, a 5-year extension trial primarily of the Ruhr University Bochum center subgroup, led by Tunn and colleagues, was conducted. [29] [44] [45] [28] [48] [47] In this study, the cyproterone acetate group was changed from intramuscular injections to 100 mg/day oral cyproterone acetate. [29] [45] Of the 39 patients in the study, the global 5-year survival rate was not significantly different between the estradiol undecylate and cyproterone acetate groups (24% and 26%, respectively). [29] [45] [28] [48] [47] In patients without metastases, the 5-year survival rate was 51% in the cyproterone acetate group relative to 43% in the estradiol undecylate group, although the difference was not statistically significant. [29] [45] In terms of non-prostate cancer deaths, there were 5 in the CPA group and 6 in the EU group. [29] The incidence of cardiovascular-related mortality was 3 deaths in the CPA group and 3 deaths in the EU group. [29]

Side effects of estradiol undecylate versus cyproterone acetate in men
Side effect Estradiol undecylate
100 mg/month i.m. (n = 96)		 Cyproterone acetate
100 mg/day oral (n = 95)
n %n %
Gynecomastia*7477.1%1212.6%
Breast tenderness*8487.5%66.3%
Sexual impotence
"Occurred in essentially all patients of both groups"
Leg edema*1717.7%44.2%
Thrombosis 44.2%55.3%
Cardiovascular mortality 22.1%22.1%
Other mortality 1a1.0%00%
Notes: For 6 months in 191 men age 51 to 88 years with prostate cancer. Footnotes: * = Differences in incidences between groups were statistically significant. a = Due to unknown causes. Sources: See template.

The side effects of estradiol undecylate have also been studied and reported beyond the preceding clinical trial programme and for other patient populations, for instance women. Side effects during therapy with massive doses of estradiol undecylate (200 mg three times per week, or 600 mg per week and around 2,400 mg per month total) in postmenopausal women with advanced breast cancer have included appetite loss, nausea, vomiting, vaginal bleeding, vaginal discharge, nipple pigmentation, breast pain, rash, urinary incontinence, edema, drowsiness, hypercalcemia, and local injection-site reactions. [34] Like with other estrogens, treatment with estradiol undecylate has been found to produce testicular abnormalities and disturbances of spermatogenesis in men. [60] In transgender women, estradiol undecylate by intramuscular injection at extremely high doses (200–800 mg/month) was associated with greater incidence of hyperprolactinemia (high prolactin levels) than ethinylestradiol orally at a dose of 100 μg/day (or about 3 mg/month total) (rates of 40% and 16% for prolactin levels greater than 1,000 mU/L, respectively). [35] Switching from estradiol undecylate to ethinylestradiol resulted in a decrease in prolactin levels in many individuals. [35] The preceding dosage of estradiol undecylate corresponds to much greater estrogenic exposure than the dosage of ethinylestradiol. [35] Cyproterone acetate was also used in combination with estrogen in the study. [35]

Overdose

Estradiol undecylate has been used clinically at massive doses of as much as 800 to 2,400 mg per month by intramuscular injection, given in divided doses of 100 to 200 mg per injection two to three times per week. [34] [15] [35] [36] [37] For purposes of comparison, a single 100 mg intramuscular injection of estradiol undecylate has been reported to produce estradiol levels of about 500 pg/mL. [61] Symptoms of estrogen overdosage may include nausea, vomiting, bloating, increased weight, water retention, breast tenderness, vaginal discharge, heavy legs, and leg cramps. [39] These side effects can be diminished by reducing the estrogen dosage. [39]

Interactions

Inhibitors and inducers of cytochrome P450 may influence the metabolism of estradiol and by extension circulating estradiol levels. [62]

Pharmacology

Estradiol, the active form of estradiol undecylate. Estradiol.svg
Estradiol, the active form of estradiol undecylate.

Pharmacodynamics

Esters of estradiol like estradiol undecylate are readily hydrolyzed prodrugs of estradiol, but have an extended duration when administered in oil via intramuscular injection due to a depot effect afforded by their fatty acid ester moiety. [5] As prodrugs of estradiol, estradiol undecylate and other estradiol esters are estrogens. [4] [5] Estradiol undecylate is of about 62% higher molecular weight than estradiol due to the presence of its C17β undecylate ester. [9] [11] Because estradiol undecylate is a prodrug of estradiol, it is considered to be a natural and bioidentical form of estrogen. [4] [18] [19]

The effects of estradiol undecylate on cortisol, dehydroepiandrosterone sulfate, testosterone, prolactin, and sex hormone-binding globulin levels as well as on the hypothalamic–pituitary–adrenal axis have been studied in men with prostate cancer and compared with those of high-dose cyproterone acetate therapy. [63] [64] [65] [66] [67] [17] [68] [69] [70] [71] The effects of estradiol undecylate on serum lipids and ceruloplasmin levels have been studied as well. [72] [73] [74] Additionally, the influence of estradiol undecylate on SHBG levels and free testosterone fraction in women has been described. [75]

Potencies and durations of natural estrogens by intramuscular injection
EstrogenFormDose (mg)Duration by dose (mg)
EPDCICD
Estradiol Aq. soln. ?–<1 d
Oil soln.40–60–1–2 ≈ 1–2 d
Aq. susp. ?3.50.5–2 ≈ 2–7 d; 3.5 ≈ >5 d
Microsph. ?–1 ≈ 30 d
Estradiol benzoate Oil soln.25–35–1.66 ≈ 2–3 d; 5 ≈ 3–6 d
Aq. susp.20–10 ≈ 16–21 d
Emulsion ?–10 ≈ 14–21 d
Estradiol dipropionate Oil soln.25–30–5 ≈ 5–8 d
Estradiol valerate Oil soln.20–3055 ≈ 7–8 d; 10 ≈ 10–14 d;
40 ≈ 14–21 d; 100 ≈ 21–28 d
Estradiol benz. butyrate Oil soln. ?1010 ≈ 21 d
Estradiol cypionate Oil soln.20–30–5 ≈ 11–14 d
Aq. susp. ?55 ≈ 14–24 d
Estradiol enanthate Oil soln. ?5–1010 ≈ 20–30 d
Estradiol dienanthate Oil soln. ?–7.5 ≈ >40 d
Estradiol undecylateOil soln. ?–10–20 ≈ 40–60 d;
25–50 ≈ 60–120 d
Polyestradiol phosphate Aq. soln.40–60–40 ≈ 30 d; 80 ≈ 60 d;
160 ≈ 120 d
Estrone Oil soln. ?–1–2 ≈ 2–3 d
Aq. susp. ?–0.1–2 ≈ 2–7 d
Estriol Oil soln. ?–1–2 ≈ 1–4 d
Polyestriol phosphate Aq. soln. ?–50 ≈ 30 d; 80 ≈ 60 d
Notes and sources
Notes: All aqueous suspensions are of microcrystalline particle size. Estradiol production during the menstrual cycle is 30–640 µg/d (6.4–8.6 mg total per month or cycle). The vaginal epithelium maturation dosage of estradiol benzoate or estradiol valerate has been reported as 5 to 7 mg/week. An effective ovulation-inhibiting dose of estradiol undecylate is 20–30 mg/month. Sources: See template.

Antigonadotropic activity

Testosterone levels with 300 mg/week cyproterone acetate or 100 mg/month estradiol undecylate both by intramuscular injection. The solid lines are the average levels and the dashed lines are the highest and lowest observed levels. Testosterone levels with 300 mg per week cyproterone acetate and 100 mg per month estradiol undecylate by intramuscular injection.png
Testosterone levels with 300 mg/week cyproterone acetate or 100 mg/month estradiol undecylate both by intramuscular injection. The solid lines are the average levels and the dashed lines are the highest and lowest observed levels.
Estradiol, testosterone, and prolactin levels with 100 mg/month estradiol undecylate by intramuscular injection in men with prostate cancer. Estradiol, testosterone, and prolactin levels during therapy with 100 mg per month estradiol undecylate in men with prostate cancer.png
Estradiol, testosterone, and prolactin levels with 100 mg/month estradiol undecylate by intramuscular injection in men with prostate cancer.

A phase III clinical trial comparing high-dose intramuscular cyproterone acetate (300 mg/week) and high-dose intramuscular estradiol undecylate (100 mg/month) in the treatment of prostate cancer found that estradiol undecylate suppressed testosterone levels into the castrate range (< 50 ng/dL) [76] within at least 3 months whereas testosterone levels with cyproterone acetate were significantly higher and above the castrate range even after 6 months of treatment. [17] With estradiol undecylate, testosterone levels fell from 416 ng/dL to 38 ng/mL (–91%) after 3 months and to 29.6 ng/dL (–93%) after 6 months, whereas with cyproterone acetate, testosterone levels fell from 434 ng/dL to 107 ng/mL (–75%) at 3 months and to 102 ng/mL (–76%) at 6 months. [17] In another study using the same dosages, estradiol undecylate suppressed testosterone levels by 97% while CPA suppressed them by 70%. [67] In accordance, whereas estrogens are well-established as able to suppress testosterone levels into the castrate range at sufficiently high dosages, [77] progestogens like cyproterone acetate on their own are able to decrease testosterone levels only up to an apparent maximum of around 70 to 80%. [78] [79] Besides effects on testosterone levels, the long-term effects of estradiol undecylate on testicular morphology in transgender women have been studied. [60]

Pharmacokinetics

The pharmacokinetics of estradiol undecylate have been assessed limitedly in a few studies. [80] [81] [82] [83] [65] [84] [7] [8] Following a single intramuscular injection of 100 mg estradiol undecylate in oil, mean levels of estradiol were about 500 pg/mL a day after injection and about 340 pg/mL 14 days after injection in 4 people. [80] Levels of estradiol with intramuscular estradiol undecylate were reported to be very irregular and to vary by as much as 10-fold between individuals. [80] In another study, following a single intramuscular injection of 32.2 mg estradiol undecylate, levels of estradiol peaked at around 400 pg/mL after 3 days and decreased from this peak to around 200 pg/mL after 6 days in 3 postmenopausal women. [81] [85] In a repeated administration study of 100 mg per month estradiol undecylate in 14 men with prostate cancer, estradiol levels at trough were about 560 pg/mL at 3 months and about 540 pg/mL at 6 months following initiation of therapy. [65] In a larger follow-up of the study with 21 men, estradiol levels at trough were about 36 pg/mL at baseline, 486 pg/mL at 3 months, and 598 pg/mL at 6 months of therapy. [70] In one further study, levels of estradiol in an unspecified number of postmenopausal women following a single injection of 100 mg estradiol undecylate were said to be between 300 pg/mL and 600 pg/mL six days post-injection. [75]

Due to its more protracted duration, doses of estradiol undecylate that are typical of other estradiol esters produce only "subthreshold" estradiol levels, and for this reason, higher single doses of estradiol undecylate are necessary for similar effects. [86] [80] [81] However, the relatively low levels of estradiol produced by lower doses of estradiol undecylate are favorable for menopausal replacement therapy. [86]

The duration of estradiol undecylate is markedly prolonged relative to that of estradiol benzoate, estradiol valerate, and many other estradiol esters. [61] [6] [20] [18] A single intramuscular injection of 10 to 12.5 mg estradiol undecylate has a duration of 40 to 60 days (~1–2 months) and of 25 to 50 mg estradiol undecylate has an estimated duration of effect of 2 to 4 months in postmenopausal women. [7] [8] [6] [20] A single intramuscular injection of 20 to 30 mg estradiol undecylate has been found to inhibit ovulation when used as an estrogen-only injectable contraceptive in premenopausal women for 1 to 3 months (mean 1.7 months) as well. [87] When used at a higher dose of 100 mg per injection in men with prostate cancer, estradiol undecylate has been given usually once a month. [17] [32] After a single subcutaneous injection of estradiol undecylate in rats, its duration of effect was 80 days (about 2.5 months). [88] [89] [90] Due to its very prolonged duration, estradiol undecylate has been described in general as a favorable alternative to estradiol implants. [8]

The excretion of estradiol undecylate has been studied as well. [83]

Estradiol undecylate has not been used via oral administration. However, a closely related estradiol ester, estradiol decanoate (estradiol decylate), has been studied via the oral route, and has been found to possess significant oral bioavailability, to produce relatively high estradiol levels of about 100 pg/mL after a single 0.5 mg oral dose and about 100 to 150 pg/mL with continuous 0.25 mg/day oral therapy, and to have a much higher estradiol-to-estrone ratio than oral estradiol of about 2:1. [91] [92] [93] It is thought that this is due to absorption of estradiol decanoate by the lymphatic system and a consequent partial bypass of first-pass metabolism in the liver and intestines, [91] [92] [93] which is similarly known to occur with oral testosterone undecanoate. [94] [95]

Chemistry

Estradiol undecylate is a synthetic estrane steroid and an estradiol ester. [9] [10] It is specifically the C17β undecylate (undecanoate) ester of estradiol. [9] [10] [11] The compound is also known as estradiol 17β-undecylate or as estra-1,3,5(10)-triene-3,17β-diol 17β-undecanoate. [10] [11] The undecylic acid (undecanoic acid) ester of estradiol undecylate is a medium-chain fatty acid and is found naturally in many foods, some examples of which include coconut, fruits, fats, oils, and rice. [97]

Estradiol undecylate is a relatively long-chain ester of estradiol. [10] [11] Its undecylate ester contains 11 carbon atoms. [10] [11] For comparison, the ester chains of estradiol acetate, estradiol valerate, and estradiol enantate have 2, 5, and 7 carbon atoms, respectively. [10] [11] As a result of its longer ester chain, estradiol undecylate is the most lipophilic of these estradiol esters, and for this reason, has by far the longest duration when administered in oil solution by intramuscular injection. [61] [98] [99] An example of an estradiol ester with a longer ester chain than estradiol undecylate is estradiol stearate (Depofollan), which has 18 carbon atoms and has been used in medicine as an estrogen as well.

A few estradiol esters related to estradiol undecylate include estradiol decanoate, estradiol diundecylate, and estradiol diundecylenate. [9] [10] Estradiol undecylate shares the same undecylate ester as testosterone undecanoate, an androgen/anabolic steroid and very long-lasting testosterone ester. [9] [10]

Estradiol undecylate is one of the longest-chain steroid esters that has been in common medical use. [100]

Structural properties of selected estradiol esters
EstrogenStructureEster(s)Relative
mol. weight		Relative
E2 contentb		log Pc
Position(s)Moiet(ies)TypeLengtha
Estradiol
Estradiol.svg
––––1.001.004.0
Estradiol acetate
Estradiol 3-acetate.svg
C3 Ethanoic acid Straight-chain fatty acid21.150.874.2
Estradiol benzoate
Estradiol benzoate.svg
C3 Benzoic acid Aromatic fatty acid– (~4–5)1.380.724.7
Estradiol dipropionate
Estradiol dipropionate.svg
C3, C17β Propanoic acid (×2)Straight-chain fatty acid3 (×2)1.410.714.9
Estradiol valerate
Estradiol valerate.svg
C17β Pentanoic acid Straight-chain fatty acid51.310.765.6–6.3
Estradiol benzoate butyrate
Estradiol butyrate benzoate.svg
C3, C17β Benzoic acid, butyric acid Mixed fatty acid– (~6, 2)1.640.616.3
Estradiol cypionate
Estradiol 17 beta-cypionate.svg
C17β Cyclopentylpropanoic acid Cyclic fatty acid– (~6)1.460.696.9
Estradiol enanthate
Estradiol enanthate.png
C17β Heptanoic acid Straight-chain fatty acid71.410.716.7–7.3
Estradiol dienanthate
Estradiol dienanthate.svg
C3, C17β Heptanoic acid (×2)Straight-chain fatty acid7 (×2)1.820.558.1–10.4
Estradiol undecylate
Estradiol undecylate.svg
C17β Undecanoic acid Straight-chain fatty acid111.620.629.2–9.8
Estradiol stearate
Estradiol stearate structure.svg
C17β Octadecanoic acid Straight-chain fatty acid181.980.5112.2–12.4
Estradiol distearate
Estradiol distearate.svg
C3, C17β Octadecanoic acid (×2)Straight-chain fatty acid18 (×2)2.960.3420.2
Estradiol sulfate
Estradiol sulfate.svg
C3 Sulfuric acid Water-soluble conjugate–1.290.770.3–3.8
Estradiol glucuronide
Estradiol sulfate.svg
C17β Glucuronic acid Water-soluble conjugate–1.650.612.1–2.7
Estramustine phosphate d
Estramustine phosphate.svg
C3, C17β Normustine, phosphoric acid Water-soluble conjugate–1.910.522.9–5.0
Polyestradiol phosphate e
Polyestradiol phosphate.svg
C3–C17β Phosphoric acid Water-soluble conjugate–1.23f0.81f2.9g
Footnotes:a = Length of ester in carbon atoms for straight-chain fatty acids or approximate length of ester in carbon atoms for aromatic or cyclic fatty acids. b = Relative estradiol content by weight (i.e., relative estrogenic exposure). c = Experimental or predicted octanol/water partition coefficient (i.e., lipophilicity/hydrophobicity). Retrieved from PubChem, ChemSpider, and DrugBank. d = Also known as estradiol normustine phosphate. e = Polymer of estradiol phosphate (~13 repeat units). f = Relative molecular weight or estradiol content per repeat unit. g = log P of repeat unit (i.e., estradiol phosphate). Sources: See individual articles.

History

Estradiol undecylate was first described in the scientific literature, along with estradiol valerate and a variety of other estradiol esters, by Karl Junkmann of Schering AG in 1953. [101] [7] It was introduced for medical use via intramuscular injection by 1956. [21] [8] [22] Syntex applied for a patent for estradiol undecylate in 1958, which was granted in 1961 and was given a priority date of 1957. [23] [102] Estradiol undecylate was introduced for medical use and was employed for decades, but was eventually discontinued. [11] [25] [38] It remained in use in some countries as late as the 2000s. [23] [11] [24]

Harry Benjamin reported on the use of estradiol undecylate in transgender women in his book The Transsexual Phenomenon in 1966 and in a literature review in the Journal of Sex Research in 1967. [14] [103]

Society and culture

Generic names

Estradiol undecylate is the generic name of the drug and its INN Tooltip International Nonproprietary Name and USAN Tooltip United States Adopted Name. [9] [10] [11] [16] It is also spelled in some publications as estradiol unducelate and is also known as estradiol undecanoate. [61] [9] [10] [11] [16] In German, it is known under a variety of spellings including as estradiolundecylat, östradiolundecylat, östradiolundezylat, oestradiolundecylat, oestradiolundezylat, and others. [104] Estradiol undecylate is known by its former developmental code names RS-1047 and SQ-9993 as well. [9] [10] [11] [16]

Brand names

The major brand name of estradiol undecylate is Progynon Depot 100. [9] [10] [11] It has also been marketed under other brand names including Delestrec, Depogin, Estrolent, Oestradiol D, Oestradiol-Retard Theramex, and Primogyn Depot [0,1 mg/ml], among others. [9] [10] [11] [23] [24]

Availability

Estradiol undecylate was available in the Europe (including in France, Germany, Great Britain, Monaco, the Netherlands, Switzerland), and Japan. [11] [23] [105] [22] [106] However, it has been discontinued and hence is no longer available. [25] [38]

Research

Estradiol undecylate was studied by Schering alone as an estrogen-only injectable contraceptive in premenopausal women at a dose of 20 to 30 mg once a month. [85] [87] [107] [108] It was effective, lacked breast and thromboembolic complications, lacked other side effects besides amenorrhea, and prevented ovulation for 1 to 3 months (mean 1.7 months) following a single dose. [87] However, uterine growth of 1 to 2 cm was observed after one year, and endometrial hyperplasia was occasionally encountered. [85] [87] [107] The preparation was not further developed as a form of birth control due to the risks of endometrial hyperplasia and cancer associated with long-term unopposed estrogen therapy. [87]

Estradiol undecylate, in combination with norethisterone enanthate (at doses of 5 to 10 mg and 50 to 70 mg, respectively), was studied by Schering as a combined injectable contraceptive in premenopausal women and was found to be effective and well-tolerated, but ultimately was not marketed for this use. [109] [108] [87] [110] [111] [112]

See also

Related Research Articles

<span class="mw-page-title-main">Estradiol valerate</span> Chemical compound

Estradiol valerate (EV), sold for use by mouth under the brand name Progynova and for use by injection under the brand names Delestrogen and Progynon Depot among others, is an estrogen medication. It is used in hormone therapy for menopausal symptoms and low estrogen levels, hormone therapy for transgender people, and in hormonal birth control. It is also used in the treatment of prostate cancer. The medication is taken by mouth or by injection into muscle or fat once every 1 to 4 weeks.

<span class="mw-page-title-main">Norethisterone acetate</span> Chemical compound

Norethisterone acetate (NETA), also known as norethindrone acetate and sold under the brand name Primolut-Nor among others, is a progestin medication which is used in birth control pills, menopausal hormone therapy, and for the treatment of gynecological disorders. The medication available in low-dose and high-dose formulations and is used alone or in combination with an estrogen. It is ingested orally.

<span class="mw-page-title-main">Polyestradiol phosphate</span> Chemical compound

Polyestradiol phosphate (PEP), sold under the brand name Estradurin, is an estrogen medication which is used primarily in the treatment of prostate cancer in men. It is also used in women to treat breast cancer, as a component of hormone therapy to treat low estrogen levels and menopausal symptoms, and as a component of feminizing hormone therapy for transgender women. It is given by injection into muscle once every four weeks.

<span class="mw-page-title-main">Gestonorone caproate</span> Chemical compound

Gestonorone caproate, also known as gestronol hexanoate or norhydroxyprogesterone caproate and sold under the brand names Depostat and Primostat, is a progestin medication which is used in the treatment of enlarged prostate and cancer of the endometrium. It is given by injection into muscle typically once a week.

Feminizing hormone therapy, also known as transfeminine hormone therapy, is hormone therapy and sex reassignment therapy to change the secondary sex characteristics of transgender people from masculine or androgynous to feminine. It is a common type of transgender hormone therapy and is used to treat transgender women and non-binary transfeminine individuals. Some, in particular intersex people, but also some non-transgender people, take this form of therapy according to their personal needs and preferences.

Combined injectable contraceptives (CICs) are a form of hormonal birth control for women. They consist of monthly injections of combined formulations containing an estrogen and a progestin to prevent pregnancy.

<span class="mw-page-title-main">Estradiol benzoate</span> Chemical compound

Estradiol benzoate (EB), sold under the brand name Progynon-B among others, is an estrogen medication which is used in hormone therapy for menopausal symptoms and low estrogen levels in women, in hormone therapy for transgender women, and in the treatment of gynecological disorders. It is also used in the treatment of prostate cancer in men. Estradiol benzoate is used in veterinary medicine as well. When used clinically, the medication is given by injection into muscle usually two to three times per week.

<span class="mw-page-title-main">Estradiol cypionate</span> Chemical compound

Estradiol cypionate (EC), sold under the brand name Depo-Estradiol among others, is an estrogen medication which is used in hormone therapy for menopausal symptoms and low estrogen levels in women, in hormone therapy for trans women, and in hormonal birth control for women. It is given by injection into muscle once every 1 to 4 weeks.

<span class="mw-page-title-main">Norethisterone enanthate</span> Chemical compound

Norethisterone enanthate (NETE), also known as norethindrone enanthate, is a form of hormonal birth control which is used to prevent pregnancy in women. It is used both as a form of progestogen-only injectable birth control and in combined injectable birth control formulations. It may be used following childbirth, miscarriage, or abortion. The failure rate per year in preventing pregnancy for the progestogen-only formulation is 2 per 100 women. Each dose of this form lasts two months with only up to two doses typically recommended.

<span class="mw-page-title-main">Estradiol enantate</span> Chemical compound

Estradiol enantate, also spelled estradiol enanthate and sold under the brand names Perlutal and Topasel among others, is an estrogen medication which is used in hormonal birth control for women. It is formulated in combination with dihydroxyprogesterone acetophenide, a progestin, and is used specifically as a combined injectable contraceptive. Estradiol enantate is not available for medical use alone. The medication, in combination with DHPA, is given by injection into muscle once a month.

<span class="mw-page-title-main">Estradiol dipropionate</span> Chemical compound

Estradiol dipropionate (EDP), sold under the brand names Agofollin, Di-Ovocylin, and Progynon DP among others, is an estrogen medication which has been used in hormone therapy for menopausal symptoms and low estrogen levels in women and in the treatment of gynecological disorders. It has also been used in feminizing hormone therapy for transgender women and in the treatment of prostate cancer in men. Although widely used in the past, estradiol dipropionate has largely been discontinued and is mostly no longer available today. It appears to remain in use only in Japan, Macedonia, and Australia. Estradiol dipropionate is given by injection into muscle at intervals ranging from once or twice a week to once every week and a half to two weeks.

An estrogen ester is an ester of an estrogen, most typically of estradiol but also of other estrogens such as estrone, estriol, and even nonsteroidal estrogens like diethylstilbestrol. Esterification renders estradiol into a prodrug of estradiol with increased resistance to first-pass metabolism, slightly improving its oral bioavailability. In addition, estrogen esters have increased lipophilicity, which results in a longer duration when given by intramuscular or subcutaneous injection due to the formation of a long-lasting local depot in muscle and fat. Conversely, this is not the case with intravenous injection or oral administration. Estrogen esters are rapidly hydrolyzed into their parent estrogen by esterases once they have been released from the depot. Because estradiol esters are prodrugs of estradiol, they are considered to be natural and bioidentical forms of estrogen.

<span class="mw-page-title-main">Cyproterone acetate</span> Chemical compound

Cyproterone acetate (CPA), sold alone under the brand name Androcur or with ethinylestradiol under the brand names Diane or Diane-35 among others, is an antiandrogen and progestin medication used in the treatment of androgen-dependent conditions such as acne, excessive body hair growth, early puberty, and prostate cancer, as a component of feminizing hormone therapy for transgender individuals, and in birth control pills. It is formulated and used both alone and in combination with an estrogen. CPA is taken by mouth one to three times per day.

<span class="mw-page-title-main">Estradiol hexahydrobenzoate</span> Chemical compound

Estradiol hexahydrobenzoate (EHHB), sold under a number of brand names including Benzo-Ginoestril A.P., BenzoGynoestryl Retard, Ginestryl-15-Depot, Menodin, and Tardoginestryl, is an estrogen medication which was previously used for indications such as menopausal hormone therapy and gynecological disorders. EHHB is given by injection into muscle at regular intervals, for instance once every few weeks.

<span class="mw-page-title-main">Estradiol dienantate</span> Chemical compound

Estradiol dienanthate (EDE), sold under the brand names Climacteron among others, is a long-acting estrogen medication which was previously used in menopausal hormone therapy for women and to suppress lactation in women. It was formulated in combination with estradiol benzoate (EB), a short-acting estrogen, and testosterone enanthate benzilic acid hydrazone (TEBH), a long-acting androgen/anabolic steroid. EDE has not been made available for medical use alone. The medication, in combination with EB and TEBH, was given by injection into muscle once or at regular intervals, for instance once every 6 weeks.

<span class="mw-page-title-main">Ethinylestradiol sulfonate</span> Estrogenic drug

Ethinylestradiol sulfonate (EES), sold under the brand names Deposiston and Turisteron among others, is an estrogen medication which has been used in birth control pills for women and in the treatment of prostate cancer in men. It has also been investigated in the treatment of breast cancer in women. The medication was combined with norethisterone acetate in birth control pills. EES is taken by mouth once per week.

<span class="mw-page-title-main">Estradiol (medication)</span> Steroidal hormone medication

Estradiol (E2) is a medication and naturally occurring steroid hormone. It is an estrogen and is used mainly in menopausal hormone therapy and to treat low sex hormone levels in women. It is also used in hormonal birth control for women, in feminizing hormone therapy for transgender women and some non-binary individuals, and in the treatment of hormone-sensitive cancers like prostate cancer in men and breast cancer in women, among other uses. Estradiol can be taken by mouth, held and dissolved under the tongue, as a gel or patch that is applied to the skin, in through the vagina, by injection into muscle or fat, or through the use of an implant that is placed into fat, among other routes.

The pharmacology of estradiol, an estrogen medication and naturally occurring steroid hormone, concerns its pharmacodynamics, pharmacokinetics, and various routes of administration.

<span class="mw-page-title-main">Pharmacokinetics of estradiol</span>

The pharmacology of estradiol, an estrogen medication and naturally occurring steroid hormone, concerns its pharmacodynamics, pharmacokinetics, and various routes of administration.

<span class="mw-page-title-main">Pharmacology of cyproterone acetate</span> Pharmaceutical compound

The pharmacology of cyproterone acetate (CPA) concerns the pharmacology of the steroidal antiandrogen and progestin medication cyproterone acetate.

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