Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood [1]. It belongs to a class of drugs called statins, which work by blocking a substance your body needs to make cholesterol [3].

According to the National Health Service (NHS) of the UK, the starting dose of Lipitor is typically 10mg or 20mg, taken once a day [2]. This dosage may be adjusted based on the patient's response to treatment and their cholesterol levels.

Without Lipitor, cholesterol levels can vary widely depending on a person's diet, exercise habits, and genetic predisposition. However, for individuals with high cholesterol, it is not uncommon for total cholesterol levels to be above 240 mg/dL and LDL (bad) cholesterol levels to be above 160 mg/dL [3].

In a study of over 10,000 patients, those taking Lipitor experienced an average reduction in LDL cholesterol levels of 39-60% and an average reduction in total cholesterol levels of 25-36% [3]. The exact reduction in cholesterol levels will depend on the individual's response to the medication and their starting cholesterol levels.

In conclusion, Lipitor can significantly lower cholesterol levels in the blood, but the exact reduction will vary depending on the individual's starting cholesterol levels and their response to the medication.

Sources:

[1] <https://www.drugpatentwatch.com/p/tradename/LIPITOR>
[2] <https://www.nhs.uk/medicines/atorvastatin/how-and-when-to-take-atorvastatin/>
[3] <https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statins/art-20045772>