Drug

XC221 clinical trials

Also written XC221.

studies test it: 8
open now: 0
in phase 3: 3
first study started: 2017

How each study uses XC221 is sorted by a rule, right about nine times in ten. Readers can ask us to read every study one by one.Ask us to read each study

Approvals

The first approval found in each region, with its record

United States: Not in FDA's approval records
European Union: Not in EMA's list of EU-wide authorisations

From FDA's Drugs@FDA and Purple Book (through openFDA) and the European Medicines Agency, files of Sept 2026 and 27 Oct 2026. National approvals in Europe and other countries are not included. How this is worked out

How studies write it

Studies that test it under each name

Name

XC221 200 mg: 3
XC221 100 mg: 2

Development codes

XC221: 4

Studies by the year they started

8 studies that test it; most in 2021 (2)

Studies that test XC221, by start year
Year	Studies
2017	1
2018	1
2019	1
2020	1
2021	2
2022	2

By phase

A phase 1/2 study counts in both.

Phase 1: 2
Phase 2: 3
Phase 3: 3

What it is tested for

Each study’s main condition, where its own words name it, so a study counts once.

Influenza, Human: 5
COVID-19: 2

Who runs them

Industry 8 · Other 0

Valenta Pharm JSC (3) · PHARMENTERPRISES LLC (3) · RSV Therapeutics LLC (2)

Studies

Open first, then newest update. How each study uses XC221 is read from its arms, and is right about nine times in ten. Ask us to read each study. These are the studies that list it as an intervention; a search of ClinicalTrials.gov also finds studies that mention it only in a description, such as earlier treatment.