Based on the provided sources, it is important to note that Lipitor (atorvastatin) is a medication commonly used to lower cholesterol levels and reduce the risk of cardiovascular diseases. However, like any medication, it can potentially have side effects, some of which may be long-term.

The first source, Drug Patent Watch, provides information on the patent status and expiration date of Lipitor but does not specifically address its long-term side effects or their reversibility. Therefore, it does not contribute to answering the question directly.

The second source, Mayo Clinic, is a reputable medical institution that discusses the side effects of statins, a class of drugs that includes Lipitor. According to the Mayo Clinic, some of the common side effects of statins include muscle pain, liver damage, and an increased risk of developing type 2 diabetes. These side effects are generally reversible upon discontinuation of the medication, but individual cases may vary. It is important to consult with a healthcare professional if you experience any side effects while taking Lipitor or any other statin.

The third source, a study published in the National Center for Biotechnology Information (NCBI), examines the long-term safety and efficacy of atorvastatin. The study concludes that atorvastatin is generally safe and well-tolerated, with few serious adverse effects. However, it also notes that rare cases of myopathy (muscle damage) and liver dysfunction have been reported with long-term use of atorvastatin. The study does not specifically address the reversibility of these long-term side effects.

In summary, while the provided sources do not explicitly state whether the long-term side effects of Lipitor are reversible, they do suggest that most side effects, such as muscle pain and liver damage, are generally reversible upon discontinuation of the medication. It is important to consult with a healthcare professional if you have concerns about the long-term side effects of Lipitor or any other medication.

Sources:
[2] Mayo Clinic. Statin side effects: Weigh the benefits and risks. Retrieved from https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013
[3] National Center for Biotechnology Information (NCBI). Atorvastatin in the treatment of primary hypercholesterolemia and mixed dyslipidemia: a comparative study. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5830056/