Lipitor is a popular medication used to lower cholesterol levels in the body. The drug is manufactured by Pfizer, and it was first approved by the FDA in 1996 [1]. According to the Pfizer website, there are certain restrictions on the Lipitor rebates that are available to patients [2]. The rebate program is only available to patients who have commercial insurance and who are not enrolled in any government-funded healthcare program, such as Medicare or Medicaid. Patients who are eligible for the rebate program can save up to $75 per month on their Lipitor prescription.

In 2011, Pfizer faced competition from generic drug manufacturers who were producing cheaper versions of Lipitor [3]. In response, Pfizer launched an aggressive marketing campaign to retain its market share. The company offered significant discounts and rebates to patients who continued to use Lipitor instead of switching to the generic version. However, it is unclear whether there were any specific restrictions on these rebates.

In conclusion, Lipitor rebates are only available to patients who have commercial insurance and who are not enrolled in any government-funded healthcare program. Pfizer offered discounts and rebates to patients to retain its market share when faced with competition from generic drug manufacturers, but it is unclear whether there were any specific restrictions on these rebates.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.lipitor.com/en/savings
[3] https://www.nytimes.com/2011/11/30/health/generic-lipitor-sets-off-an-aggressive-push-by-pfizer.html