Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], Lipitor's patent expired in 2011, and the drug is now available in generic form.

Healthline [2] suggests that taking statins like Lipitor at night can be more effective than taking them in the morning. This is because the body produces more cholesterol at night, so taking the medication before bed can target the cholesterol production and reduce levels more effectively. Additionally, taking Lipitor at night may reduce the risk of side effects, such as muscle pain and liver damage.

Drugs.com [3] supports this claim, stating that taking Lipitor at night can increase its effectiveness by up to 26%. However, it is important to note that taking Lipitor at any time of day can be effective as long as it is taken consistently and as prescribed by a healthcare provider.

In conclusion, taking Lipitor at night may increase its effectiveness and reduce the risk of side effects. However, it is important to follow the instructions of a healthcare provider and take the medication consistently.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.healthline.com/health/high-cholesterol/why-should-you-take-statins-at-night
[3] https://www.drugs.com/medical-answers/does-lipitor-work-better-if-you-take-it-at-night-416127/