It seems some treatments have worked OK abroad:-

Doctors in India have successfully treated coronavirus patients with a cocktail of drugs developed to treat of HIV, swine flu, and malaria.

Doctors at Sawai Man Singh (SMS) Hospital, Jaipur, treated an Italian tourist with a daily combination of two drugs useful in HIV treatment– Lopinavir and Ritonavir.

The doctors also gave the woman a malaria medication, chloroquine, and oseltamivir which was developed during the swine flu epidemic.