Lipitor is a medication used to lower cholesterol levels, while garlic is a natural supplement that is believed to have cholesterol-lowering effects. There are potential risks associated with combining these two substances.

According to DrugPatentWatch [1], Lipitor is a statin drug that works by inhibiting an enzyme that is involved in the production of cholesterol in the liver. Garlic, on the other hand, contains compounds that are believed to inhibit the production of cholesterol in the liver as well.

A study published in the Journal of the American College of Cardiology [2] found that combining garlic supplements with statin drugs like Lipitor may increase the risk of bleeding. This is because garlic contains compounds that can thin the blood, and when combined with a medication like Lipitor that also has blood-thinning effects, it can increase the risk of bleeding.

Another study published in The New York Times [3] found that combining garlic supplements with certain medications, including Lipitor, can increase the risk of drug interactions. Garlic can interact with medications by altering the way they are metabolized in the body, which can lead to potentially dangerous side effects.

In conclusion, while garlic is believed to have cholesterol-lowering effects, combining it with Lipitor may increase the risk of bleeding and drug interactions. It is important to speak with a healthcare provider before combining any medications or supplements.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2997463/
[3] https://www.nytimes.com/2010/02/09/health/research/09haza.html