Estrogens, conjugated synthetic a
As of the edition of 20 October 2026, Estrogens, conjugated synthetic a is a drug: marketed, first approved in 1999 (US); acts on ESR1 and ESR2; no US protection is listed.
Sources: FDA Orange Book and Purple Book, other approval registers, ClinicalTrials.gov, ChEMBL.
The drug
- Status
- Marketed; latest approval 1999
- Kind
- Unknown
- Brand name
- Cenestin
- First approved
- 24 March 1999 (US)
- Approvals on record
- 6 in 1 region
- Holder of the most recent approval
- Teva; 2 holders in all
- Registered trials
- 2, 0 stopped early
US protection
No US protection is listed.
The FDA registers list no drug-substance patent or exclusivity that counts for this drug.
This is the US only.
Companies that need a new molecule because of this drug
2 company-target rows on route B because of this drug.
Companies on route B for this drug
In the product2 company-target rows are on route B because of Estrogens, conjugated synthetic a.
See the 2 company-target rows on route B for this drug, with the facts behind eachRequest access. Nothing is shown until you do.
Targets
Registered trials
| Phase | Trials | Completed | Active | Stopped early |
|---|---|---|---|---|
| Phase 3 | 2 | 2 | 0 | 0 |
| All trials | 2 |
Who has held its approvals
| Company | Role | Years |
|---|---|---|
| Teva | Originator and Acquired holder | 1999 to now |
| Aspen Pharma | Acquired holder | 2019 to now |