Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood, while aspirin is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, reduce fever, and prevent blood clots. There are no significant interactions between Lipitor and aspirin [3]. However, it is essential to consult a healthcare provider before taking these medications together, especially if you have a history of stomach ulcers, bleeding disorders, or liver disease [2]. According to Drugpatentwatch, Lipitor has no known drug interactions [1]. HealthCentral suggests that taking aspirin and Lipitor at the same time may increase the risk of gastrointestinal bleeding, but this risk is relatively low [2]. Therefore, it is crucial to follow the dosage and instructions provided by your healthcare provider to avoid any adverse effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.healthcentral.com/article/aspirin-lipitor-time
[3] https://www.drugs.com/drug-interactions/aspirin-with-lipitor-243-0-276-128.html