Who makes Phosphestrol?

Phosphestrol is developed by Bayer.

What development phase is Phosphestrol in?

Phosphestrol is FDA-approved (marketed).

What is the generic name of Phosphestrol?

fosfestrol is the generic (nonproprietary) name of Phosphestrol.

Last reviewed 2026-04-20 · How we verify

Phosphestrol (fosfestrol)

Bayer · FDA-approved active Quality 10/100

At a glance

Generic name	fosfestrol
Sponsor	Bayer
Drug class	fosfestrol
Target	Estrogen receptor
Therapeutic area	Other
Phase	FDA-approved

Approved indications

No approved indications tracked.

Common side effects

No common side effects on file.

Key clinical trials

A Phase III Study of Radium-223 Dichloride in Patients With Symptomatic Hormone Refractory Prostate Cancer With Skeletal Metastases (PHASE3)
Efficacy and Safety Evaluating Study to Compare Uritos® (Imidafenacin) and Urotol® (Tolterodine) for Treatment of Overactive Bladder. (PHASE3)
Ibudilast in the Treatment of Patients With Chronic Migraine. (PHASE1)

Primary sources

Every claim on this page is sourced from regulatory or scientific primary sources. See our editorial policy for full methodology.

Source	Used for
ClinicalTrials.gov	Trial enrolment, design, endpoints, results

Competitive intelligence

For the full competitive landscape — auto-detected comparators, recent regulatory actions across the set, upcoming PDUFA, patent timeline, sponsor landscape:

Phosphestrol CI brief — competitive landscape report
Phosphestrol updates RSS · CI watch RSS
Bayer portfolio CI