Lipitor, a medication used to lower cholesterol levels, is not typically associated with causing stomach upset when taken with ibuprofen. However, ibuprofen is known to increase the risk of stomach irritation and ulcers. To help protect the stomach while taking ibuprofen, it is advisable to use medications like omeprazole, which can reduce stomach acid and prevent irritation. Omeprazole is often recommended for those who need to take ibuprofen regularly to reduce the risk of stomach issues. If you experience persistent stomach upset while taking Lipitor and ibuprofen together, it is recommended to consult a healthcare professional for guidance on managing these symptoms effectively [3][2][1].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/omeprazole/taking-omeprazole-with-other-medicines-and-herbal-supplements/
[3] https://www.mayoclinic.org/diseases-conditions/gerd/expert-answers/heartburn-gerd/faq-20058535