Meridia is a prescription medication designed to help with obesity, aiding in weight loss and maintenance. It works by influencing certain chemicals in the brain that play a role in managing weight. You can use Meridia on its own or alongside other medications. This drug falls under a category known as Schedule IV controlled substances. However, due to the potential for serious cardiovascular issues in some users, sibutramine, or Meridia, is no longer available in the United States.