Shionogi has obtained fast track designation from the US Food and Drug Administration (FDA) for its ensitrelvir fumaric acid, an investigational oral antiviral drug for the treatment of Covid-19.

The approval allows Shionogi to develop and accelerate the evaluation of ensitrelvir.

Discover B2B Marketing That Performs

Combine business intelligence and editorial excellence to reach engaged professionals across 36 leading media platforms.

Find out more

Japan’s Ministry of Health, Labour and Welfare (MHLW) granted emergency regulatory approval to ensitrelvir, a 125mg tablet known in the country as Xocova, to treat SARS-CoV-2 infection in November 2022. Outside Japan, it still remains an investigational therapy.

The drug is capable of curbing the duplication of SARS-CoV-2 by selectively inhibiting the viral 3CL protease, when given once daily for five days.

Shionogi is currently investigating the safety and efficacy of ensitrelvir across Covid-19 patient groups in a number of Phase lll trials. The firm also plans to initiate new studies to further assess the drug.

Shionogi US subsidiary CEO Nathan McCutcheon said: “There is a need for additional Covid-19 treatment options, as SARS-CoV-2 continues to affect people in the US. Receiving fast-track designation from the FDA recognises the potential of ensitrelvir as a once-daily, oral antiviral for SARS-CoV-2.

GlobalData Strategic Intelligence

US Tariffs are shifting - will you react or anticipate?

Don’t let policy changes catch you off guard. Stay proactive with real-time data and expert analysis.

By GlobalData

“We look forward to our continued discussions with the FDA to bring ensitrelvir to patients as soon as possible.”

Ensitrelvir has been created through joint research between Shionogi and Hokkaido University. It has not received approval outside Japan.

Pharmaceutical Technology Excellence Awards - Nominations Closed

Nominations are now closed for the Pharmaceutical Technology Excellence Awards. A big thanks to all the organisations that entered – your response has been outstanding, showcasing exceptional innovation, leadership, and impact.

Excellence in Action
Awarded the 2025 Pharmaceutical Technology Excellence Award for Business Expansion in Integrated Manufacturing, Upperton Pharma Solutions is rapidly expanding its UK GMP and sterile manufacturing footprint. Find out how Upperton’s integrated CDMO model helps pharma companies move from early development to clinical and niche commercial supply with fewer handovers and faster timelines.

Discover the Impact