Who are Add-back's main competitors?

Direct comparators (same drug class / molecular target / therapeutic area): Natazia, Faslodex, Ortho Evra, Elocon, Gynorest, Progesterone.

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Every 30 minutes from primary sources (FDA, EMA, MHRA, PMDA, ClinicalTrials.gov, USPTO). Subscribe to the RSS feed below for push alerts.

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Last reviewed 2026-05-15 · How we verify

Add-back — Competitive Intelligence Brief

Add-back (Add-back) competitive landscape: 6 comparators, recent regulatory actions, upcoming PDUFA, patent timeline. Class: Progestin (add-back therapy component). Area: Gynecology / Reproductive Health.

phase 3 Progestin (add-back therapy component) Progesterone receptor Gynecology / Reproductive Health Small molecule Live · refreshed every 30 min

Target snapshot

Add-back (Add-back) — ObsEva SA. Add-back is a progestin (norethisterone acetate) co-administered with a GnRH agonist to mitigate hypogonadal side effects while maintaining the therapeutic benefits of GnRH suppression.

Comparator set (6 drugs)

Auto-detected by same drug class / molecular target / therapeutic area, ranked by phase + recency. Override with ?vs=slug1,slug2,….

Drug	Generic	Sponsor	Phase	Class	Target	Approval / PDUFA
Add-back TARGET	Add-back	ObsEva SA	phase 3	Progestin (add-back therapy component)	Progesterone receptor
Natazia	DIENOGEST	Mochida Pharmaceutical Co., Ltd.	marketed	Progestin	Progesterone receptor	2010-01-01
Faslodex	fulvestrant	AstraZeneca	marketed	Estrogen Receptor Antagonist [EPC]	Progesterone receptor	2002-01-01
Ortho Evra	NORELGESTROMIN		marketed	Estrogen [EPC]	Progesterone receptor	2001-01-01
Elocon	MOMETASONE FUROATE	Merck & Co.	marketed	Corticosteroid	Progesterone receptor	1987-01-01
Gynorest	DYDROGESTERONE	Solvay	marketed	dydrogesterone	Progesterone receptor	1982-01-01
Progesterone	Progesterone plus HCG	Dunamenti REK Istenhegyi IVF Center	marketed	Progesterone [EPC]	progesterone receptor, luteinizing hormone/choriogonadotropin receptor	1978-01-01

Recent regulatory actions (last 90 days)

No regulatory actions in the last 90 days for this set.

Upcoming PDUFA dates (next 180 days)

No PDUFA dates in the next 180 days for this set.

Patent timeline (forward window)

2026-11-29 — Elocon · 7544192 · Method of Use · US
2027-06-12 — Elocon · 8025635 · Formulation · US
2028-01-30 — Natazia · 8153616 · US
2031-10-03 — Elocon · 10357640 · Method of Use · US
2032-02-08 — Elocon · 8763222 · Formulation · US
2034-02-14 — Faslodex · 10188663 · Formulation · US
2034-02-14 — Faslodex · 9833459 · Formulation · US
2034-03-13 — Elocon · 10406332 · Formulation · US
2034-05-17 — Faslodex · 9271990 · Formulation · US
2034-11-24 — Elocon · 10232152 · Formulation · US

Sponsor landscape (Progestin (add-back therapy component) class)

ObsEva SA · 1 drug in this class

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Cite this brief

Drug Landscape (2026). Add-back — Competitive Intelligence Brief. https://druglandscape.com/ci/add-back. Accessed 2026-05-15.

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