The invention provides compositions containing omega-3 oil and at least one anti-inflammatory agent and/or at least one gastrotoxic, nephrotoxic, or hepatotoxic pharmaceutical agent. The invention further provides kits containing these compositions and methods for decreasing pain or inflammation, decreasing the symptoms of an allergic condition, and/or the gastrotoxicity, nephrotoxicity, and hepatotoxicity of a pharmaceutical agent in a subject (e.g., a human) or companion animal requiring the administration of at least one composition containing omega-3 oil. The invention also provides methods for formulating an anti-inflammatory agent to increase its absorption rate requiring the mixing of omega-3 oil with the anti-inflammatory agent and methods of concentrating an omega-3 oil.
