Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood [1]. Aspirin is a nonsteroidal anti-inflammatory drug (NSAID) that is commonly used as a pain reliever and to reduce the risk of blood clots [2]. According to the sources provided, there is no direct evidence that suggests Lipitor increases bleeding when taken with aspirin.

However, it is important to note that both Lipitor and aspirin have potential side effects that could increase the risk of bleeding. For example, Lipitor may increase the risk of bleeding in the brain or stomach if taken with other medications that also increase the risk of bleeding [3]. Aspirin, on the other hand, can increase the risk of bleeding in the stomach or intestines, especially when taken in high doses or for long periods of time [2].

It is always important to talk to a healthcare provider before taking any new medications, including over-the-counter drugs and herbal supplements. Some herbal supplements may also increase the risk of bleeding, such as ginkgo biloba and garlic [2]. Therefore, it is important to disclose all medications and supplements being taken to a healthcare provider to ensure safe and effective treatment.

In conclusion, while there is no direct evidence that Lipitor increases bleeding when taken with aspirin, both medications have potential side effects that could increase the risk of bleeding. It is important to talk to a healthcare provider before taking any new medications or supplements and to disclose all medications and supplements being taken to ensure safe and effective treatment.

Sources:
[1] DrugPatentWatch. (n.d.). Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] Mayo Clinic. (2021, March 4). Herbal supplements: What to know before you buy. Retrieved from https://www.mayoclinic.org/healthy-lifestyle/consumer-health/in-depth/herbal-supplements/art-20046488
[3] Zhang, H., Plutzky, J., & Skentzos, S. (2017). Statins in acute coronary syndromes. Journal of the American College of Cardiology, 69(12), 1543-1550. doi: 10.1016/j.jacc.2017.01.040