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Ethinyl Estradioll/Levonorgestrel

Small molecule · developed by Atea Pharmaceuticals

Phase 1 Most advanced trial (none active)

AVIR Developer

1 Registered trials

What is Ethinyl Estradioll/Levonorgestrel?

Ethinyl estradiol/levonorgestrel (Portia 21) is a combination oral tablet of 0.03 mg ethinyl estradiol and 0.15 mg levonorgestrel.

Summary written with AI from the sources listed at the end of this page.

At a glance

Also known as: Portia 21
Drug type: Small molecule
Developer: Atea Pharmaceuticals, Inc. (AVIR)
FDA status: Investigational, not approved in the US. Most advanced trial: Phase 1

🧪 Clinical trials

Trial	Phase	Condition	Status	Sponsor
NCT07272889	Phase 1	Healthy Volunteer Study	Completed	AVIR

Trials of the companies BioRadar tracks, from ClinicalTrials.gov, most advanced phase first.

Conditions studied

Healthy Volunteer Study

More from Atea Pharmaceuticals

AT-527 Phase 1 AT-587 Phase 1 AT-752 Phase 2 AT-777 Phase 1/2 Bemnifosbuvir Phase 3 Bemnifosbuvir-Ruzasvir Phase 3 Ruzasvir Phase 2 Treatment A-Bemnifosbuvir/Ruzasvir FDC Phase 1

Sources

Updated Oct 11, 2026. Something wrong or missing? Report it on the AVIR page.

Follow AVIR, the company behind Ethinyl Estradioll/Levonorgestrel

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Data: FDA (Drugs@FDA, Purple Book, DailyMed), NIH (NCI Thesaurus, GSRS, RxNorm), ClinicalTrials.gov • Informational purposes only, not medical or investment advice. • All drugs A–Z