Lipitor is a prescription medication used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], Pfizer's patent for Lipitor expired in November 2011, allowing other companies to produce and sell generic versions of the drug. However, it is important to note that expiration dates for medications, including Lipitor, are not always an exact science.

According to Harvard Health Publishing [2], expiration dates on medications are not always based on scientific evidence. The expiration date is usually set by the manufacturer based on how long they guarantee the drug will be effective and safe to use. However, many medications, including Lipitor, may still be effective and safe to use after their expiration date.

The expiration date on a medication label indicates the date until which the drug is guaranteed to be effective and safe to use. However, it does not necessarily mean that the drug will be ineffective or unsafe to use after that date. A study conducted by the FDA [3] found that 90% of more than 100 drugs, both prescription and over-the-counter, were still effective beyond their expiration date.

When it comes to bulk orders of Lipitor, it is important to follow proper storage guidelines to ensure the medication remains effective and safe to use. Lipitor should be stored at room temperature and protected from light and moisture. If stored properly, bulk orders of Lipitor may remain effective and safe to use beyond their expiration date.

In conclusion, while expiration dates on medications, including Lipitor, are not always an exact science, it is important to follow proper storage guidelines to ensure the medication remains effective and safe to use. Bulk orders of Lipitor may remain effective and safe to use beyond their expiration date if stored properly.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.health.harvard.edu/staying-healthy/drug-expiration-dates-do-they-mean-anything
[3] https://www.npr.org/sections/health-shots/2017/07/18/537257884/that-drug-expiration-date-may-be-more-myth-than-fact