Lipitor is a prescription medication used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], Lipitor's patent expired in 2011, which means it is now available as a generic drug. As for the disposal of expired Lipitor, the FDA recommends disposing of it by flushing it down the toilet only if it is on their flush list [2]. However, the DEA suggests that flushing should be the last resort for disposal of medications, as it may harm the environment [3]. The DEA advises that expired medications, including Lipitor, should be disposed of through drug take-back programs or by mixing them with an unpalatable substance, such as cat litter or coffee grounds, and placing them in the trash [3]. It is important to follow the disposal instructions provided with the medication or to consult with a pharmacist or healthcare provider for proper disposal methods.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.fda.gov/drugs/disposal-unused-medicines-what-you-should-know/drug-disposal-fdas-flush-list-certain-medicines
[3] https://www.dea.gov/sites/default/files/2018-10/Proper%20Disposal%20Flier%20%28October%202018%29.pdf