Lipitor is a brand name for the drug atorvastatin, which is a type of statin used to lower cholesterol levels in the blood. Fish oil, on the other hand, is a dietary supplement that contains omega-3 fatty acids, which have been shown to have a variety of health benefits, including reducing inflammation and improving heart health [2].

There is no known interaction between Lipitor and fish oil, and studies have shown that taking fish oil supplements along with statins may provide additional benefits for heart health [3]. However, it is important to note that both Lipitor and fish oil can have side effects.

Common side effects of Lipitor include muscle pain, weakness, and tenderness, as well as digestive issues like nausea, diarrhea, and constipation [1]. In rare cases, Lipitor can also cause more serious side effects like liver damage, kidney problems, and a rare but serious muscle condition called rhabdomyolysis [1].

Fish oil supplements can also have side effects, including nausea, diarrhea, and a fishy aftertaste [2]. In rare cases, fish oil supplements can also increase the risk of bleeding, especially if taken in high doses or in combination with blood-thinning medications [2].

In conclusion, there is no known negative interaction between Lipitor and fish oil, and taking fish oil supplements may even provide additional benefits for heart health. However, both Lipitor and fish oil can have side effects, so it is important to talk to a doctor before taking any new medications or supplements [1][2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/fish-oil-vs-statins
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6320142/