is likely to cause massive cardiac arrest if taken in large doses 
(ROOT (VP (VBZ is) (ADJP (JJ likely) (S (VP (TO to) (VP (VB cause) (NP (JJ massive) (JJ cardiac) (NN arrest)) (SBAR (IN if) (S (VP (VBN taken) (PP (IN in) (NP (JJ large) (NNS doses))))))))))))
(ROOT (VP (VBZ ) (ADJP (JJ ) (S (VP (TO ) (VP (VB ) (NP (JJ ) (JJ ) (NN )) (SBAR (IN ) (S (VP (VBN ) (PP (IN ) (NP (JJ ) (NNS ))))))))))))