Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood, while aspirin is a medication used to reduce pain and inflammation and prevent blood clots. According to the sources provided, there are no known interactions between Lipitor and aspirin, and they can be taken together in most cases.

However, it is important to note that both medications can increase the risk of bleeding, especially if taken together with other blood-thinning medications or in high doses. Therefore, it is important to talk to a healthcare provider before taking Lipitor and aspirin together, especially if you have a history of bleeding disorders or stomach ulcers.

In addition, it is important to follow the recommended dosages and schedules for both medications, as taking too much of either medication can cause serious side effects. As with any medication, it is important to talk to a healthcare provider before starting or stopping any medication, and to report any unusual side effects or symptoms.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.healthcentral.com/article/aspirin-lipitor-time
[3] https://www.frontiersin.org/articles/10.3389/fphar.2021.589418/full