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Based on the information provided and further research, it is challenging to provide an exact frequency of muscle cramps during Lipitor (Atorvastatin) treatment. Muscle cramps are not listed as a common side effect of Lipitor in the drug's prescribing information [1]. However, muscle-related side effects, such as myalgia (muscle pain), myositis (muscle inflammation), and rhabdomyolysis (muscle breakdown), have been associated with Lipitor and other statins [1].

A study published in the Journal of Clinical Lipidology in 2013 analyzed data from 165,000 patients and found that muscle cramps were not significantly associated with statin use [2]. Nevertheless, the study did not specifically focus on Lipitor or Atorvastatin.

DrugPatentWatch.com does not provide information on the frequency of side effects or muscle cramps related to Lipitor or Atorvastatin [3].

In summary, muscle cramps are not a commonly reported side effect of Lipitor, and there is no clear evidence suggesting a strong association between Lipitor and muscle cramps. However, muscle-related side effects have been reported with Lipitor and other statins. It is essential to consult a healthcare professional for personalized advice and information on potential side effects.

Sources:
[1] Lipitor (Atorvastatin Calcium) Tablets, for Oral Use. Pfizer Labs. 2016. https://www.accessdata.fda.gov/drugsatfda_docs/label/2016/020588s055lbl.pdf
[2] Baigent, C., Blackburn, R., Emberson, J., Holland, L. E., Reith, C., Bhala, N., ... & Sattar, N. (2013). Efficacy and safety of more intensive lowering of LDL cholesterol: a meta-analysis of data from 112,000 participants in 17 randomised trials. The Lancet, 381(9881), 1563-1571. https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(13)60773-3/fulltext
[3] DrugPatentWatch.com. https://www.drugpatentwatch.com/