Lipitor is a brand-name drug that contains the active ingredient atorvastatin. Atorvastatin is a type of medication known as a statin, which is used to lower cholesterol levels in the blood. Lipitor is manufactured by Pfizer, and it was first approved by the US Food and Drug Administration (FDA) in 1996 [3].

The patent for Lipitor expired in 2011, which means that other companies can now produce and sell generic versions of the drug [3]. Some of the available generic versions of Lipitor include atorvastatin calcium, atorvastatin magnesium, and atorvastatin calcium and amlodipine besylate [1]. These generic versions are available in various strengths, ranging from 10mg to 80mg [2].

It is important to note that while generic versions of Lipitor contain the same active ingredient as the brand-name drug, they may have different inactive ingredients, which can affect how the drug is absorbed and metabolized by the body [2]. It is also important to talk to a healthcare provider before switching from a brand-name drug to a generic version, as they can provide guidance on the best course of treatment for each individual patient.

In conclusion, some of the available generic versions of Lipitor include atorvastatin calcium, atorvastatin magnesium, and atorvastatin calcium and amlodipine besylate. However, it is important to consult with a healthcare provider before making any changes to medication regimens.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.everydayhealth.com/drugs/lipitor
[3] https://www.medicalnewstoday.com/articles/lipitor