Lipitor, also known as Atorvastatin, is a prescription medication used to lower cholesterol levels in the body. The drug works by blocking the enzyme responsible for producing cholesterol in the liver. According to [1], Lipitor's patent expired in 2011, and since then, generic versions of the drug have become available in the market.

Like all medications, Lipitor can cause side effects. Some of the most common side effects of the drug include headache, nausea, diarrhea, muscle pain, and joint pain. These side effects are usually mild and go away on their own after a few days or weeks. However, in rare cases, Lipitor can cause serious side effects, such as liver damage, muscle damage, and an increased risk of developing diabetes.

If you experience any of the following symptoms while taking Lipitor, you should seek medical attention immediately: yellowing of the skin or eyes, dark urine, severe muscle pain, weakness, or tenderness, unexplained tiredness, fever, or abdominal pain. These symptoms may indicate a serious condition that requires immediate medical attention.

According to [2], reducing the dose of Lipitor or stopping the medication altogether may cause the cholesterol levels to rise again. However, there are no specific side effects associated with reducing the dose of Lipitor. If you are considering reducing your Lipitor dose, you should talk to your doctor first. Your doctor may recommend alternative treatments or lifestyle changes to help manage your cholesterol levels.

In conclusion, Lipitor is a medication used to lower cholesterol levels in the body. While the drug is generally safe and well-tolerated, it can cause side effects in some people. If you experience any symptoms while taking Lipitor, you should seek medical attention immediately. There are no specific side effects associated with reducing the dose of Lipitor, but you should talk to your doctor before making any changes to your medication regimen.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013