They are commonly used as antiviral drugs because they block the function of viral neuraminidases of the influenza virus , by preventing its reproduction by budding from the host cell .
PRON AUX ADV VERB ADP ADJ NOUN SCONJ PRON VERB DET NOUN ADP ADJ NOUN ADP DET NOUN NOUN , ADP VERB PRON NOUN ADP VERB ADP DET NOUN NOUN .