Citigroup analyst Neena Bitritto-Garg downgrades Arena Pharmaceuticals (NASDAQ:ARNA) from Buy to Neutral and lowers the price target from $101 to $100.Citigroup analyst Neena Bitritto-Garg downgrades Arena Pharmaceuticals (NASDAQ:ARNA) from Buy to Neutral and lowers the price target from $101 to $100.