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A Phase 3 study of ensitrelvir in pediatric participants aged < 6 years

A Phase 3 study of ensitrelvir in pediatric participants aged < 6 years with SARS-CoV-2 infection

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
JPRN
Registry ID
JPRN-jRCT2031250501
Enrollment
40
Registered
2025-11-14
Start date
2025-11-27
Completion date
Unknown
Last updated
2026-09-14

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

SARS-CoV-2 infection

Interventions

Oral administration of ensitrelvir granules once daily for 5 days

Sponsors

Gomez Juan Carlos
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: -Participant who was diagnosed as SARS-CoV-2 positive within 72 hours before enrollment -Participant who may be enrolled within 72 hours after COVID-19 onset -Participant who has at least one moderate or severe COVID-19 symptom at screening -Participant who the investigator (sub-investigator) judges to be able to take the study intervention. -Participant whose weight is less than 30 kg at the screening visit.

Exclusion criteria

Exclusion criteria: -Participant with SpO2 of <= 93% (room air) -Participant who weighed less than 2.5 kg at the screening visit, or who were under 1 year of age at the time of consent and weighed less than 2.5 kg at birth, or who were premature (born before 37 weeks). -Participant requiring oxygen treatment -Participant requiring mechanical ventilation -Participant who is strongly suspected to have worsening of SARS-CoV-2 infection symptoms within 48 hours after enrollment -Participant who is suspected to have active systemic infection requiring treatment -Participant who has or suspected to have MIS-C/PIMS -Participant who is known to have renal impairment with CrCl of < 30 mL/min by the Schwartz formula or requiring dialysis -Participant who has severe hepatic impairment -Participant who has history of epilepsy

Design outcomes

Primary

MeasureTime frame
-Adverse events, laboratory tests, vital signs -Plasma concentration of ensitrelvir

Contacts

Public ContactCorporate Communications Department

Shionogi & Co., Ltd.

shionogiclintrials-admin@shionogi.co.jp+81-6-6209-7885

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Sep 19, 2026