 Patients can stop using it if they respond well, but there are potentially dangerous side effects including brain swelling and brain bleeds. Allison Keys, CBS News. Six Flags and Cedar Park have finalized their $8 billion merger to form one big amusement park corporation. It'll operate under the Six Flags brand, but the company says park names won't change. They have, however, promised to open new rides. At least two are opening this week alone in Texas. This is CBS News.