( Tamiflu ( ( is ( ( a pill ) ( ( taken ( over ( ( a period ) ( of ( five days ) ) ) ) ) ( to ( ( block ( the ( flu virus ) ) ) ( from ( leaving ( infected cells ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Tamiflu)) (VP (VBZ is) (NP (NP (DT a) (NN pill)) (VP (VBN taken) (PP (IN over) (NP (NP (DT a) (NN period)) (PP (IN of) (NP (CD five) (NNS days))))) (S (VP (TO to) (VP (VB block) (NP (DT the) (NN flu) (NN virus)) (PP (IN from) (S (VP (VBG leaving) (NP (JJ infected) (NNS cells))))))))))) (. .)))
Tamiflu is a pill taken over a period of five days to block the flu virus from leaving infected cells.
(ROOT (S (NP (NNP Tamiflu)) (VP (VBZ inhibits) (NP (NP (NN spread)) (PP (IN of) (NP (NN virus))))) (. .)))