Well controlled on Lipitor.
 He is on no medication
(ROOT (S (RB Well) (VP (VBN controlled) (PP (IN on) (NP (NNP Lipitor)))) (. .)))
(ROOT (S (NP (PRP He)) (VP (VBZ is) (PP (IN on) (NP (DT no) (NN medication))))))
( Well ( ( controlled ( on Lipitor ) ) . ) )
( He ( is ( on ( no medication ) ) ) )