Which class of agents is designed to lower abnormal lipid levels in the body?

The class of agents specifically designed to lower abnormal lipid levels in the body is anti-hyperlipidemic agents. These drugs are used to manage conditions like high cholesterol and triglycerides, which can lead to cardiovascular issues, by reducing lipid levels in the bloodstream. They often work by various mechanisms such as inhibiting cholesterol production in the liver, enhancing cholesterol removal from the bloodstream, or increasing the breakdown of lipids.

In contrast, antidiabetic agents focus on managing blood glucose levels rather than lipid levels. Anticoagulants are intended to prevent blood clotting, while antidepressants are used to treat mood disorders. Each of these classes has a distinct purpose that does not involve the modulation of lipid levels, highlighting why anti-hyperlipidemic agents are the correct choice for this question.