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Mestranol

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Mestranol
Clinical data
Trade namesEnovid, Norinyl, Ortho-Novum, others
Other namesEthinylestradiol 3-methyl ether; EEME; EE3ME; CB-8027; L-33355; RS-1044; 17α-Ethynylestradiol 3-methyl ether; 17α-Ethynyl-3-methoxyestra-1,3,5(10)-trien-17β-ol; 3-Methoxy-19-norpregna-1,3,5(10)-trien-20-yn-17β-ol
AHFS/Drugs.comInternational Drug Names
MedlinePlusa601050
Routes of
administration		By mouth[1]
Drug classEstrogen; Estrogen ether
ATC code
  • None
Legal status
Legal status
  • In general: ℞ (Prescription only)
Pharmacokinetic data
MetabolitesEthinylestradiol
Elimination half-lifeMestranol: 50 min[2]
EE: 7–36 hours[3][4][5][6]
Identifiers
  • (8R,9S,13S,14S,17R)-17-ethynyl-3-methoxy-13-methyl-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-17-ol
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.000.707 Edit this at Wikidata
Chemical and physical data
FormulaC21H26O2
Molar mass310.437 g·mol−1
3D model (JSmol)
  • O(c1cc4c(cc1)[C@H]3CC[C@]2([C@@H](CC[C@]2(C#C)O)[C@@H]3CC4)C)C
  • InChI=1S/C21H26O2/c1-4-21(22)12-10-19-18-7-5-14-13-15(23-3)6-8-16(14)17(18)9-11-20(19,21)2/h1,6,8,13,17-19,22H,5,7,9-12H2,2-3H3/t17-,18-,19+,20+,21+/m1/s1 checkY
  • Key:IMSSROKUHAOUJS-MJCUULBUSA-N checkY
  (verify)

Mestranol, sold under the brand names Enovid, Norinyl, and Ortho-Novum among others, is an estrogen medication which has been used in birth control pills, menopausal hormone therapy, and the treatment of menstrual disorders.[1][7][8][9] It is formulated in combination with a progestin and is not available alone.[9] It is taken by mouth.[1]

Side effects of mestranol include nausea, breast tension, edema, and breakthrough bleeding among others.[10] It is an estrogen, or an agonist of the estrogen receptors, the biological target of estrogens like estradiol.[11] Mestranol is a prodrug of ethinylestradiol in the body.[11]

Mestranol was discovered in 1956 and was introduced for medical use in 1957.[12][13] It was the estrogen component in the first birth control pill.[12][13] In 1969, mestranol was replaced by ethinylestradiol in most birth control pills, although mestranol continues to be used in a few birth control pills even today.[14][9] Mestranol remains available only in a few countries, including the United States, United Kingdom, Japan, and Chile.[9]

Medical uses

Mestranol was employed as the estrogen component in many of the first oral contraceptives, such as mestranol/noretynodrel (brand name Enovid) and mestranol/norethisterone (brand names Ortho-Novum, Norinyl), and is still in use today.[7][8][9] In addition to its use as an oral contraceptive, mestranol has been used as a component of menopausal hormone therapy for the treatment of menopausal symptoms.[1]

Side effects

See also: Ethinylestradiol § Side effects, and Estrogen (medication) § Side effects

Pharmacology

Ethinylestradiol (EE), the active form of mestranol.

Mestranol is a biologically inactive prodrug of ethinylestradiol to which it is demethylated in the liver (via O-Dealkylation) with a conversion efficiency of 70% (50 μg of mestranol is pharmacokinetically bioequivalent to 35 μg of ethinylestradiol).[15][16][11] It has been found to possess 0.1 to 2.3% of the relative binding affinity of estradiol (100%) for the estrogen receptor, compared to 75 to 190% for ethinylestradiol.[17][18]

The elimination half-life of mestranol has been reported to be 50 minutes.[2] The elimination half-life of the active form of mestranol, ethinylestradiol, is 7 to 36 hours.[3][4][5][6]

The effective ovulation-inhibiting dosage of mestranol has been studied in women.[19][20][21] It has been reported to be about 98% effective at inhibiting ovulation at a dosage of 75 or 80 μg/day.[22][21][23] In another study, the ovulation rate was 15.4% at 50 μg/day, 5.7% at 80 μg/day, and 1.1% at 100 μg/day.[24]

Affinities and estrogenic potencies of estrogen esters and ethers at the estrogen receptors
Estrogen Other names RBATooltip Relative binding affinity (%)a REP (%)b
ER ERα ERβ
Estradiol E2 100 100 100
Estradiol 3-sulfate E2S; E2-3S ? 0.02 0.04
Estradiol 3-glucuronide E2-3G ? 0.02 0.09
Estradiol 17β-glucuronide E2-17G ? 0.002 0.0002
Estradiol benzoate EB; Estradiol 3-benzoate 10 1.1 0.52
Estradiol 17β-acetate E2-17A 31–45 24 ?
Estradiol diacetate EDA; Estradiol 3,17β-diacetate ? 0.79 ?
Estradiol propionate EP; Estradiol 17β-propionate 19–26 2.6 ?
Estradiol valerate EV; Estradiol 17β-valerate 2–11 0.04–21 ?
Estradiol cypionate EC; Estradiol 17β-cypionate ?c 4.0 ?
Estradiol palmitate Estradiol 17β-palmitate 0 ? ?
Estradiol stearate Estradiol 17β-stearate 0 ? ?
Estrone E1; 17-Ketoestradiol 11 5.3–38 14
Estrone sulfate E1S; Estrone 3-sulfate 2 0.004 0.002
Estrone glucuronide E1G; Estrone 3-glucuronide ? <0.001 0.0006
Ethinylestradiol EE; 17α-Ethynylestradiol 100 17–150 129
Mestranol EE 3-methyl ether 1 1.3–8.2 0.16
Quinestrol EE 3-cyclopentyl ether ? 0.37 ?
Footnotes: a = Relative binding affinities (RBAs) were determined via in-vitro displacement of labeled estradiol from estrogen receptors (ERs) generally of rodent uterine cytosol. Estrogen esters are variably hydrolyzed into estrogens in these systems (shorter ester chain length -> greater rate of hydrolysis) and the ER RBAs of the esters decrease strongly when hydrolysis is prevented. b = Relative estrogenic potencies (REPs) were calculated from half-maximal effective concentrations (EC50) that were determined via in-vitro β‐galactosidase (β-gal) and green fluorescent protein (GFP) production assays in yeast expressing human ERα and human ERβ. Both mammalian cells and yeast have the capacity to hydrolyze estrogen esters. c = The affinities of estradiol cypionate for the ERs are similar to those of estradiol valerate and estradiol benzoate (figure). Sources: See template page.
Potencies of oral estrogens[data sources 1]
Compound Dosage for specific uses (mg usually)[a]
ETD[b] EPD[b] MSD[b] MSD[c] OID[c] TSD[c]
Estradiol (non-micronized) 30 ≥120–300 120 6 - -
Estradiol (micronized) 6–12 60–80 14–42 1–2 >5 >8
Estradiol valerate 6–12 60–80 14–42 1–2 - >8
Estradiol benzoate - 60–140 - - - -
Estriol ≥20 120–150[d] 28–126 1–6 >5 -
Estriol succinate - 140–150[d] 28–126 2–6 - -
Estrone sulfate 12 60 42 2 - -
Conjugated estrogens 5–12 60–80 8.4–25 0.625–1.25 >3.75 7.5
Ethinylestradiol 200 μg 1–2 280 μg 20–40 μg 100 μg 100 μg
Mestranol 300 μg 1.5–3.0 300–600 μg 25–30 μg >80 μg -
Quinestrol 300 μg 2–4 500 μg 25–50 μg - -
Methylestradiol - 2 - - - -
Diethylstilbestrol 2.5 20–30 11 0.5–2.0 >5 3
DES dipropionate - 15–30 - - - -
Dienestrol 5 30–40 42 0.5–4.0 - -
Dienestrol diacetate 3–5 30–60 - - - -
Hexestrol - 70–110 - - - -
Chlorotrianisene - >100 - - >48 -
Methallenestril - 400 - - - -
Sources and footnotes:
  1. ^ [25][26][27][28][29][30] [31][32][33][34] [35][36][37][38][39][40][41][42][43]
  1. ^ Dosages are given in milligrams unless otherwise noted.
  2. ^ a b c Dosed every 2 to 3 weeks
  3. ^ a b c Dosed daily
  4. ^ a b In divided doses, 3x/day; irregular and atypical proliferation.

Chemistry

See also: List of estrogens and List of estrogen esters § Ethers of steroidal estrogens

Mestranol, also known as ethinylestradiol 3-methyl ether (EEME) or as 17α-ethynyl-3-methoxyestra-1,3,5(10)-trien-17β-ol, is a synthetic estrane steroid and a derivative of estradiol.[44][45][46] It is specifically a derivative of ethinylestradiol (17α-ethynylestradiol) with a methyl ether at the C3 position.[44][45]

History

In April 1956, noretynodrel was investigated, in Puerto Rico, in the first large-scale clinical trial of a progestogen as an oral contraceptive.[12][13] The trial was conducted in Puerto Rico due to the high birth rate in the country and concerns of moral censure in the United States.[47] It was discovered early into the study that the initial chemical syntheses of noretynodrel had been contaminated with small amounts (1–2%) of the 3-methyl ether of ethinylestradiol (noretynodrel having been synthesized from ethinylestradiol).[12][13] When this impurity was removed, higher rates of breakthrough bleeding occurred.[12][13] As a result, mestranol, that same year (1956),[48] was developed and serendipitously identified as a very potent synthetic estrogen (and eventually as a prodrug of ethinylestradiol), given its name, and added back to the formulation.[12][13] This resulted in Enovid by G. D. Searle & Company, the first oral contraceptive and a combination of 9.85 mg noretynodrel and 150 μg mestranol per pill.[12][13]

Around 1969, mestranol was replaced by ethinylestradiol in most combined oral contraceptives due to widespread panic about the recently uncovered increased risk of venous thromboembolism with estrogen-containing oral contraceptives.[14] The rationale was that ethinylestradiol was approximately twice as potent by weight as mestranol and hence that the dose could be halved, which it was thought might result in a lower incidence of venous thromboembolism.[14] Whether this actually did result in a lower incidence of venous thromboembolism has never been assessed.[14]

Society and culture

Generic names

Mestranol is the generic name of the drug and its INNTooltip International Nonproprietary Name, USANTooltip United States Adopted Name, USPTooltip United States Pharmacopeia, BANTooltip British Approved Name, DCFTooltip Dénomination Commune Française, and JANTooltip Japanese Accepted Name, while mestranolo is its DCITTooltip Denominazione Comune Italiana.[44][45][1][9]

Brand names

Mestranol has been marketed under a variety of brand names, mostly or exclusively in combination with progestins, including Devocin, Enavid, Enovid, Femigen, Mestranol, Norbiogest, Ortho-Novin, Ortho-Novum, Ovastol, and Tranel among others.[7][44][49][45] Today, it continues to be sold in combination with progestins under brand names including Lutedion, Necon, Norinyl, Ortho-Novum, and Sophia.[9]

Availability

Mestranol remains available only in the United States, the United Kingdom, Japan, and Chile.[9] It is only marketed in combination with progestins, such as norethisterone.[9]

Research

Mestranol has been studied as a male contraceptive and was found to be highly effective.[50][51][52][53] At a dosage of 0.45 mg/day, it suppressed gonadotropin levels, reduced sperm count to zero within 4 to 6 weeks, and decreased libido, erectile function, and testicular size.[50][51][53][52] Gynecomastia occurred in all of the men.[50][51][53][52] These findings contributed to the conclusion that estrogens would be unacceptable as contraceptives for men.[51]

Environmental presence

In 2021, mestranol was one of the 12 compounds identified in sludge samples taken from 12 wastewater treatment plants in California that were collectively associated with estrogenic activity in in vitro. [54]

References

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  54. ^ Black GP, He G, Denison MS, Young TM (May 2021). "Using Estrogenic Activity and Nontargeted Chemical Analysis to Identify Contaminants in Sewage Sludge". Environmental Science & Technology. 55 (10): 6729–6739. Bibcode:2021EnST...55.6729B. doi:10.1021/acs.est.0c07846. PMC 8378343. PMID 33909413.
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