It marks the second large deal for AbbVie in the past week, coming days after it agreed to buy cancer drug developer ImmunoGen for $10.1 billion in cash, highlighting its appetite to place big bets on promising new medicines. It is paying $45 per share in cash for Cerevel, which is developing drugs for Alzheimer's, Parkinson's, psychosis, epilepsy, and panic disorder. Its experimental drug emraclidine is in midstage trials as a treatment for schizophrenia that will yield data the company hopes can be used to seek regulatory approval.