Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels and reduce the risk of heart attack and stroke [2]. According to Drug Patent Watch, the patent for Lipitor expired in 2011, which means that generic versions of the drug are available [1].

As for the duration of Lipitor's effects, it is important to note that the medication does not cure high cholesterol, but rather manages it. Therefore, if a person stops taking Lipitor, their cholesterol levels may increase again [2].

Regarding the side effects of Lipitor, muscle pain is a common one. GoodRx suggests that muscle pain can occur within a few days or weeks of starting the medication, and it may take several weeks or months for the pain to go away after discontinuing the medication [3]. However, it is important to note that not everyone experiences muscle pain as a side effect of Lipitor, and some people may experience it to a lesser degree than others.

In conclusion, the effects of Lipitor do not wear off completely after discontinuing the medication, as high cholesterol levels may return. Muscle pain, a common side effect of Lipitor, may take several weeks or months to go away after stopping the medication [2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.singlecare.com/blog/lipitor-side-effects/
[3] https://www.goodrx.com/classes/statins/muscle-pain-statins-how-to-prevent-common-side-effect