Both Lipitor (atorvastatin) and Simvastatin (Zocor) are commonly used to treat high cholesterol. While both drugs work similarly, they have some differences in terms of side effects and effectiveness.

Lipitor is known to have fewer side effects compared to Simvastatin. The most common side effects of Lipitor include muscle pain, weakness, and stomach pain. However, these side effects are usually mild and go away on their own. On the other hand, Simvastatin is known to have more side effects, including muscle pain, liver problems, and digestive issues.

Studies have shown that Lipitor is more effective in lowering cholesterol levels than Simvastatin. In fact, Lipitor has been shown to reduce LDL cholesterol levels by up to 60%, while Simvastatin only reduces LDL cholesterol levels by up to 50%.

It's important to note that both drugs can interact with other medications and cause serious side effects. It's important to talk to your doctor before taking any new medication and to let them know about any other medications you're taking.

In conclusion, while both Lipitor and Simvastatin are effective in treating high cholesterol, Lipitor is generally considered to have fewer side effects and is more effective in lowering cholesterol levels. However, it's important to talk to your doctor before taking any new medication and to let them know about any other medications you're taking.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicinenet.com/atorvastatin_lipitor_vs_simvastatin_zocor/drug-vs.htm
[3] https://www.goodrx.com/conditions/high-cholesterol/atorvastatin-vs-simvastatin-which-is-better-for-high-cholesterol.