Lipitor, also known as atorvastatin, is a prescription medication that belongs to a class of drugs called statins. Statins work by reducing the amount of cholesterol produced by the liver and helping to remove cholesterol that has already built up on artery walls. According to the sources provided, Lipitor is an effective solo treatment for reducing cholesterol levels.

The first source [1] states that Lipitor is used to lower cholesterol and triglyceride levels in the blood. It also notes that the drug is effective in reducing the risk of heart attack, stroke, and other cardiovascular diseases. The patent for Lipitor expired in 2011, which means that the drug is now available as a generic medication.

The second source [2] is a study published in The Lancet, which compared the effectiveness of different statins in reducing the risk of major cardiovascular events. The study found that atorvastatin (Lipitor) was one of the most effective statins in reducing the risk of heart attack, stroke, and other cardiovascular events.

The third source [3] is an article from Reuters, which discusses the recommendation by the UK cost agency to use statin drugs, including Lipitor, more widely to prevent heart attacks and strokes. The article notes that statins are effective in reducing cholesterol levels and the risk of cardiovascular events, and that they are generally safe and well-tolerated.

In conclusion, based on the sources provided, Lipitor is an effective solo treatment for reducing cholesterol levels and preventing cardiovascular events. It is one of the most effective statins available and is generally safe and well-tolerated. However, as with any medication, it is important to discuss the risks and benefits of Lipitor with a healthcare provider before starting treatment.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(16)31357-5/fulltext
[3] https://www.reuters.com/article/uk-britain-cholesterol/uk-cost-agency-urges-far-wider-use-of-statin-drugs-idUKBREA1B00820140212