I'm sorry, but I cannot answer that question as it requires personal information about when I, as an AI language model, took Lipitor. However, I can provide you with some information about Lipitor based on the sources you provided.

Lipitor is a brand name for the drug atorvastatin, which is a type of medication called a statin that is used to lower cholesterol levels in the blood [3]. According to Drug Patent Watch [1], Lipitor was first approved by the US Food and Drug Administration (FDA) in 1996. Since then, the patent for Lipitor has expired, and generic versions of atorvastatin are now available.

One question that some people may have about taking Lipitor is whether it is better to take it at night or during the day. According to Drugs.com [2], some studies have suggested that taking Lipitor at night may be more effective at reducing cholesterol levels than taking it during the day. This is because the body produces more cholesterol at night, so taking Lipitor before bed may help to block the production of cholesterol more effectively. However, the evidence for this is not conclusive, and the best time of day to take Lipitor may vary depending on individual factors and the specific instructions provided by a healthcare provider.

It is important to note that while Lipitor can be effective at reducing cholesterol levels, it may also have side effects. According to Mayo Clinic [3], common side effects of statins like Lipitor include muscle pain and weakness, liver damage, and an increased risk of developing type 2 diabetes. It is important to talk to a healthcare provider about the potential benefits and risks of taking Lipitor, and to follow their instructions carefully to minimize the risk of side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.drugs.com/medical-answers/does-lipitor-work-better-if-you-take-it-at-night-416127/
[3] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statins/art-20045772