Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the body. The drug works by inhibiting the enzyme HMG-CoA reductase, which is responsible for producing cholesterol in the liver [1]. However, there is limited information available on the direct effect of Lipitor on platelet aggregation.

According to a study published in the Journal of Thrombosis and Haemostasis, atorvastatin was found to have no significant effect on platelet aggregation in patients with stable coronary artery disease [2]. Another study published in Circulation showed that atorvastatin did not affect platelet aggregation in patients with acute coronary syndrome [3].

While these studies suggest that Lipitor has no significant effect on platelet aggregation, it is important to note that further research may be needed to fully understand the drug's impact on platelet function. Additionally, it is always recommended to consult with a healthcare professional before taking any medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://pubmed.ncbi.nlm.nih.gov/15255464/
[3] https://www.ahajournals.org/doi/10.1161/01.cir.0000047060.60595.cc.