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Lipitor, a medication used to treat high cholesterol, does not directly affect the efficacy of birth control pills [1]. However, it's important to note that certain medications can interact with hormonal birth control methods, reducing their effectiveness.

Lipitor, a statin, works by lowering the amount of cholesterol produced by the body [2]. It does not interact with the hormones used in birth control pills.

However, grapefruit and grapefruit juice can interact with Lipitor, potentially leading to increased levels of the drug in the body [3]. This interaction is unrelated to birth control pills, but it's worth mentioning as it can lead to adverse effects.

Always consult with a healthcare provider or pharmacist for personalized advice regarding medication interactions [4].

Sources:
[1] https://www.drugs.com/drug-interactions/lovastatin-with-ethinyl-estradiol-norethindrone,lovastatin-oral-tablet.html
[2] https://medlineplus.gov/druginfo/meds/a697027.html
[3] https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/what-you-need-know-and-what-you-can-do-avoid-grapefruit-juice-interactions-your-medicines
[4] https://www.drugpatentwatch.com/