Estradiol benzoate/progesterone

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Estradiol benzoate/progesterone
Estradiol benzoate (top) and
progesterone (bottom)
Combination of
Estradiol benzoateEstrogen
ProgesteroneProgestogen
Clinical data
Trade namesClinomin Forte, Duogynon, Lutrogen, Sistocyclin, Vermagest, others
Other namesEB/P4
Routes of
administration		Intramuscular injection (oil solution, aqueous suspension)
ATC code
Identifiers
CAS Number
PubChem CID
ChemSpider
UNII

Estradiol benzoate/progesterone (EB/P4), sold under the brand names Duogynon and Sistocyclin among others, is a combination medication of estradiol benzoate (EB), an estrogen, and progesterone (P4), a progestogen.[1][2][3] It has been formulated both as short-acting oil solutions and long-acting microcrystalline aqueous suspensions and is given by injection into muscle either once or continuously at regular intervals.[4][5]

EB/P4 was one of the first combined estrogen and progestogen medications to be introduced for medical use.[6] It was first marketed in Germany as an oil solution in 1950.[6] Microcrystalline EB/P4 in aqueous suspension was developed and marketed under the brand name Sistocyclin several years later.[6] EB/P4 was eventually superseded by longer-acting parenteral estrogen–progestogen combinations as well as by oral estrogen–progestogen combinations.[6]

Medical uses

EB/P4 has been used to treat menstrual disorders such as secondary amenorrhea and menstrual irregularity,[4][5] as a form of emergency contraception within 48 hours of sexual intercourse,[7][8] and as a test for pregnancy.[4][5] In the form of a microcrystalline aqueous suspension, EB/P4 has particularly been used to treat functional uterine bleeding.[9][10]

EB/P4 has been studied in the treatment of breast cancer in women and found to be effective.[11][12][13]

Available forms

EB/P4 is or has been available for use by intramuscular injection both in the form of short-acting oil solutions (e.g., Duogynon, Lutrogen) and long-acting microcrystalline aqueous suspensions (e.g., Clinomin Forte, Sistocyclin).[4][5] [14] These are provided as ampoules, with the oil-solution ampoules containing 2–3 mg EB and 12.5–50 mg progesterone and the aqueous-suspension ampoules containing 10 mg EB and 200 mg progesterone.[4] The crystal sizes in microcrystalline EB/P4 in aqueous suspension (Sistocyclin) are 0.01 to 0.02 mm for EB crystals and 0.02 to 0.1 mm for P4 crystals.[15][16][17] An oil-solution ampoule containing 30 mg EB and 30 mg P4 (brand name Vermagest) is used as an injectable emergency contraceptive.[18][7][8] Clinomin Forte is an aqueous suspension of EB/P4 that additionally contains lidocaine and remains available today.[19]

Side effects

See also: Estradiol (medication) § Side effects, Estradiol benzoate § Side effects, and Progesterone (medication) § Side effects

Pharmacology

Pharmacodynamics

EB is an estrogen, or an agonist of the estrogen receptors, the biological target of estrogens like endogenous estradiol.[20] It is an estradiol ester and prodrug of estradiol with a longer duration of action than estradiol when administered by intramuscular injection in oil solution or aqueous suspension.[20] P4 is a progestogen, or an agonist of the progesterone receptors, the biological target of progestogens like endogenous progesterone.[20]

The full endometrial transformation dosage of EB/P4 in oil solution is 1 to 2 mg EB and 20 to 25 mg P4 by intramuscular injection daily for 10 to 14 days, whereas the full endometrial transformation dosage of EB/P4 in microcrystalline aqueous suspension is a single intramuscular injection of 10 mg EB and 200 mg P4.[6] For comparison, the full endometrial transformation dosage of estradiol valerate and hydroxyprogesterone caproate in oil solution (brand name Gravibinon) is a single intramuscular injection of 10 mg estradiol valerate and 250 to 375 mg hydroxyprogesterone caproate.[6] Endometrial transformation normally occurs during the luteal phase of the menstrual cycle; it is induced by endogenous progesterone following adequate priming by endogenous estradiol.[21]

The decidua (pregnancy-type endometrium) induction dosage of EB/P4 in oil solution is 2 to 5 mg EB and 20 to 100 mg P4 by intramuscular injection daily for 5 to 7 weeks, whereas the decidua induction dosage of EB/P4 in microcrystalline aqueous suspension is 10 to 20 mg EB and 200 to 250 mg P4 in microcrystalline aqueous suspension by intramuscular injection once per week for about 6 weeks.[6] For comparison, the decidua induction dosage of estradiol valerate and hydroxyprogesterone caproate in oil solution is about the same as that of microcrystalline EB/P4 in aqueous suspension.[6] The decidua induction dosages of estrogen and progestogen combinations are pseudopregnancy dosages.[6]

Pharmacokinetics

EB/P4 is administered by intramuscular injection a single time or continuously at regular intervals, depending on the indication.[4][5][22] Amorphous EB/P4 in oil solution (e.g., Duogynon, Lutrogen) is reported to have a duration of action of 2 days in terms of the progestogen component, and hence is a short-acting preparation, whereas microcrystalline EB/P4 in aqueous suspension (e.g., Sistocyclin) has a duration of 10 to 12 days, and hence is a long-acting preparation.[22][5] A study found that a single intramuscular injection of 10 mg microcrystalline EB in aqueous suspension with a 0.05 mm crystal size (similar to that in Sistocyclin) resulted in a maximal 7-fold increase in estradiol excretion on the 2nd day after injection and maintained elevated estradiol excretion for 17 days.[16][17]

Potencies and durations of natural estrogens by intramuscular injection
Estrogen Form Dose (mg) Duration by dose (mg)
EPD CICD
Estradiol Aq. soln. ? – <1 d
Oil soln. 40–60 – 1–2 ≈ 1–2 d
Aq. susp. ? 3.5 0.5–2 ≈ 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. 20–30 5 5 ≈ 7–8 d; 10 ≈ 10–14 d;
40 ≈ 14–21 d; 100 ≈ 21–28 d
Estradiol benz. butyrate Oil soln. ? 10 10 ≈ 21 d
Estradiol cypionate Oil soln. 20–30 – 5 ≈ 11–14 d
Aq. susp. ? 5 5 ≈ 14–24 d
Estradiol enanthate Oil soln. ? 5–10 10 ≈ 20–30 d
Estradiol dienanthate Oil soln. ? – 7.5 ≈ >40 d
Estradiol undecylate Oil 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.
Parenteral potencies and durations of progestogens[a][b]
Compound Form Dose for specific uses (mg)[c] DOA[d]
TFD[e] POICD[f] CICD[g]
Algestone acetophenide Oil soln. - – 75–150 14–32 d
Gestonorone caproate Oil soln. 25–50 – – 8–13 d
Hydroxyprogest. acetate[h] Aq. susp. 350 – – 9–16 d
Hydroxyprogest. caproate Oil soln. 250–500[i] – 250–500 5–21 d
Medroxyprog. acetate Aq. susp. 50–100 150 25 14–50+ d
Megestrol acetate Aq. susp. - – 25 >14 d
Norethisterone enanthate Oil soln. 100–200 200 50 11–52 d
Progesterone Oil soln. 200[i] – – 2–6 d
Aq. soln. ? – – 1–2 d
Aq. susp. 50–200 – – 7–14 d
Notes and sources:
  1. ^ Sources: [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]
  2. ^ All given by intramuscular or subcutaneous injection.
  3. ^ Progesterone production during the luteal phase is ~25 (15–50) mg/day. The OIDTooltip ovulation-inhibiting dose of OHPC is 250 to 500 mg/month.
  4. ^ Duration of action in days.
  5. ^ Usually given for 14 days.
  6. ^ Usually dosed every two to three months.
  7. ^ Usually dosed once monthly.
  8. ^ Never marketed or approved by this route.
  9. ^ a b In divided doses (2 × 125 or 250 mg for OHPC, 10 × 20 mg for P4).

History

EB/P4 in oil solution for use by intramuscular injection was first marketed in Germany in 1950.[6] It was one of the first combined estrogen and progestogen medications to be introduced for medical use.[6] To achieve a longer duration of action, microcrystalline EB/P4 with defined crystal sizes in aqueous suspension was developed, studied in 1954,[42] and marketed under the brand name Sistocyclin shortly thereafter in the 1950s.[11][9][10][5][14] Formulations containing a combination of EB or estradiol valerate (an estradiol ester with a longer duration than EB) and the longer-acting synthetic progestogen hydroxyprogesterone caproate in oil solution (brand names Primosiston, Gravibinon) were introduced in 1955 and eventually superseded EB/P4.[6] Oral estrogen–progestogen combinations, such as mestranol/noretynodrel (brand name Enovid), were also introduced in the 1950s, and soon replaced EB/P4 for menstrual and other indications as well.[6]

Society and culture

Brand names

EB/P4 has been marketed under a large number of brand names including Component E-C, Component E-S, Di Pro Oleosum, Duogynon, Duogynon ampule, Duogynon forte, Duogynon simplex, Duoton Fort T P, Emmenovis, Estroprogyn, Gestrygen, Implus-C, Implus S, Jephagynon, Klimovan, Limovanil, Lutofolone, Menovis, Menstrogen Forte, Mestrolar, Metrigen Fuerte, Nomestrol, Phenokinon-F, Pro-Estramon-S, Prodiol, Proger F, Progestediol, Sistocyclin, Synovex C, Synovex S, and Tonevex S.[1][2][3][43]

Availability

EB/P4 was originally developed and marketed in Europe.[4][5] Today, it is available in a number of places in the world including various Latin American countries, Egypt, Italy, Lebanon, Taiwan, Thailand, Turkey, Malaysia, and Ethiopia.[1][2][3] EB/P4 is available specifically as an injectable emergency contraceptive in El Salvador, Honduras, and Nicaragua.[18][7][8]

EB/P4 in oil solution remains widely available throughout the world.[1][2][44][45] Conversely, Sistocyclin, or microcrystalline EB/P4 in aqueous suspension, is no longer marketed.[1][2][44][45] However, individual formulations of microcrystalline EB in aqueous suspension (brand name Agofollin Depot)[46] and microcrystalline P4 in aqueous suspension (brand name Agolutin Depot)[47] remain available in some countries, including the Czech Republic and Slovakia.[1][2][44][45]

Veterinary uses

EB/P4 is used in veterinary medicine under the brand names Component E-C, Component E-S, Synovex C, and Synovex S, among others.[1][2]

See also

References

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  2. ^ a b c d e f g "Progesterone". Drugs.com. Retrieved 2018-07-31.
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  6. ^ a b c d e f g h i j k l m Kaiser R (July 1993). "[Gestagen-estrogen combinations in gynecology. On the history, dosage and use of a hormone principle]" [Progestogen-Estrogen Combinations in Gynecology. History, Dosage, and Use of a Hormone Principle]. Geburtshilfe und Frauenheilkunde. 53 (7): 503–513. doi:10.1055/s-2007-1022924. PMID 8370495. S2CID 71261744. Zur kombinierten Anwendung von Gestagen en und Östrogenen stand en zunächst ölgelöstes Östradiolbenzoat und Progesteron zur Verfügung. Das erste derartige Mischpräparat kam in Deutschland 1950 auf den Mark t. Dem Wunsch nach verlän gerter Wirkungsdauer entsprach en dann Kristallmischsuspension en verschiedener Korngröße aus Östradiolmonobenzoat + Progesteron, deren Anwendung sich auf klinische Untersuchungen besch ränkte (83). Ölgelöste Depotpräparate mit Östradiolbenzoat oder -valerat + 17-hydroxyprogesteroncaproat wurden ab 1955 in die Therapie eingeführt (45.46).
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