According to the sources provided, Lipitor (atorvastatin) does not have any direct effect on potassium levels. However, some medications can interact with Lipitor and affect potassium levels. For example, certain blood pressure medications, such as ACE inhibitors and potassium-sparing diuretics, can increase potassium levels in the blood. Conversely, some medications, such as corticosteroids and some laxatives, can decrease potassium levels. It is important to inform your healthcare provider of all medications you are taking, including over-the-counter medications and supplements, to ensure safe and effective treatment. If you experience symptoms such as muscle weakness, fatigue, or irregular heartbeat, contact your healthcare provider immediately as these could be signs of a potassium imbalance.

Sources:
[1] Drug Patent Watch. Lipitor. https://www.drugpatentwatch.com/p/tradename/LIPITOR.
[2] GoodRx. These Drugs Can Mess with Your Potassium. https://www.goodrx.com/drugs/side-effects/these-drugs-can-mess-with-your-potassium.
[3] Everyday Health. Lipitor. https://www.everydayhealth.com/drugs/lipitor.