It’s an IL-6 blocker developed for rheumatoid arthritis. It’s got serious side effects. Unfortunately the only article I could find that discusses side effects is in Spanish.
https://www.sopitas.com/noticias/levilimab-se...ronavirus/

“The drug, however, can only be supplied in hospitals and is contraindicated in children under 18 years of age, pregnant and lactating women, patients with liver failure and patients with bacterial infections in the acute phase. “