Gemfibrozil, sold under the brand name Lopid among others, is a medication used to treat abnormal blood lipid levels.

[3] Common side effects include headache, dizziness, feeling tired, and intestinal upset.

[5] It belongs to the fibrates group of medications and works by decreasing the breakdown of lipids in fat cells.

[11] Gemfibrozil was selected from a series of related compounds synthesized in the laboratories of the American company Parke-Davis in the late 1970s.

[12] Gemfibrozil has been detected in biosolids (the solids remaining after sewage treatment) at concentrations up to 2650 ng/g wet weight.