https://www.nature.com/articles/d41586-023-00548-6
The drug’s manufacturer, Shionogi in Osaka, Japan, says the data also show that ensitrelvir has the potential to prevent long COVID. But scientists are sceptical about that claim and critical of the design of the clinical trial.
(ensitrelvir=販売名ゾコーバ)

とNatureに紹介されているがかなり懐疑的な目で見られている