Statins are the drug of first choice for the treatment of most dyslipidemias. They have excellent efficacy in reducing the concentration of low-density lipoprotein cholesterol (LDL-C) and have been proven to reduce the incidence of cardiovascular events, although differences exist in the lipid-modifying properties of these agents. Combination therapy may be considered for patients who do not achieve their lipid goal despite optimization of statin treatment. In severely hypercholesterolemic patients, combinations of statins with bile acid sequestrants, plant sterols or specific cholesterol absorption inhibitors may provide additional reductions in LDL-C and extend the therapeutic options in these difficult-to-treat patients. In patients with mixed dyslipidemias, combination of a statin with niacin or a fibrate may be necessary to fully correct lipid abnormalities. Although these combinations may be associated with an increased incidence of adverse effects, particularly myopathy and hepatotoxicity, recent clinical trials suggest that the benefit of enhanced efficacy across the lipid profile out weighs the risk of toxicity. Nevertheless, statin-niacin or statin-fibrate combinations should only be considered after careful risk-benefit assessment, and patients should be well informed of potential side effects. Doses of each drug should be kept to a minimum in order to reduce the risk of adverse effects. Combination treatment with statins and fish oil has shown promising improvements in several lipid parameters without an increase in systemic toxicity, and this combination may be a useful addition to the options available for treatment of refractory patients who cannot tolerate statin-niacin or statin-fibrate combinations.