Use of fluvoxamine (a selective serotonin reuptake inhibitor (SSRI) in the treatment of Covid patients. 

Serotonin reuptake is reduced thus histamine release is decreased as a result.

Binding of ASM is inhibited reducing spreading potential of Covid in the body.

Fluvoxamine also inhibits melatonin degradation thereby reducing inflamation.

Sukhatme VP, Reiersen AM, Vayttaden SJ and Sukhatme VV (2021) Fluvoxamine: A Review of Its Mechanism of Action and Its Role in COVID-19. Front. Pharmacol. 12:652688. doi: 10.3389/fphar.2021.652688