o·sel·tam·i·vir 
(ō′sĕl′tămə-vîr′)
(ō′sĕl′tămə-vîr′)n.
An antiviral drug, C16H28N2O4, used in its phosphate form for the treatment and prevention of influenza.
[oselt-, of unknown origin + -amivir, neuraminidase inhibitor suffix ((NEUR)AMI(NIDASE INHIBITOR) + (ANTI)VIR(AL)).]