According to the sources provided, there may be differences in dosage for generic Lipitor, also known as atorvastatin.

The first source, Drug Patent Watch [1], provides information on the expiration of the patent for Lipitor, which occurred in 2011. This allowed for the production of generic versions of the drug, including atorvastatin. However, the site does not provide information on dosage differences for the generic version.

The second source, a study published in the US National Library of Medicine [2], provides information on the effectiveness and safety of different doses of atorvastatin. The study found that lower doses of atorvastatin were just as effective as higher doses in reducing LDL cholesterol levels, but with fewer side effects. The study also notes that the recommended starting dose of atorvastatin for most patients is 10-20 mg per day, with adjustments made based on individual patient needs.

The third source, GoodRx [3], provides a comparison chart of different statins, including atorvastatin, and their corresponding intensities. The chart shows that atorvastatin is available in doses ranging from 10 mg to 80 mg, with higher doses considered to be more intense. However, the chart does not provide information on whether there are any differences in dosage for generic versions of atorvastatin.

In conclusion, while there may be differences in dosage for generic Lipitor, the sources provided do not provide conclusive information on this topic. It is important to consult with a healthcare provider to determine the appropriate dosage of atorvastatin for individual patients.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4859299/
[3] https://www.goodrx.com/classes/statins/intensity-comparison-chart