The invention is directed to methods for treating hyperlipidemia in a mammal. The methods involve combination therapies using a microsomal triglyceride transfer protein (MTP) inhibitor (for example, BMS-201038 and implitapide) and a HMG-CoA reductase inhibitor (for example simvastatin or atorvastatin). Co-administration of the MTP inhibitor with the HMG-CoA reductase inhibitor produces a therapeutic benefit, for example, a reduction in the concentration of cholesterol and/or triglycerides in the blood stream, but with fewer or reduced side effects than when higher dosages of the MTP inhibitor are used during monotherapy to provide the same or similar therapeutic benefit.
