Lipitor is a brand name for the drug atorvastatin, which is a type of statin medication used to lower cholesterol levels in the body. According to Drug Patent Watch [1], the recommended starting dose of Lipitor for adults is usually 10-20 mg per day, which can be increased to a maximum of 80 mg per day if needed. However, the dosage may vary depending on the individual's medical history, age, and other factors.

One of the main reasons for prescribing Lipitor is to lower low-density lipoprotein (LDL) cholesterol levels, which is often referred to as "bad" cholesterol. However, Lipitor can also help increase high-density lipoprotein (HDL) cholesterol levels, which is often referred to as "good" cholesterol. According to a study published in PubMed [2], Lipitor treatment was associated with a significant increase in HDL cholesterol levels in patients with low HDL levels.

The Mayo Clinic [3] recommends that individuals with low HDL levels should aim to increase their levels through lifestyle changes such as regular exercise, quitting smoking, and maintaining a healthy weight. However, if these measures are not effective, medication such as Lipitor may be prescribed to help increase HDL levels.

In conclusion, the recommended starting dose of Lipitor for adults is usually 10-20 mg per day, which can be increased to a maximum of 80 mg per day if needed. Lipitor can help increase HDL cholesterol levels in patients with low HDL levels. However, lifestyle changes should be the first line of treatment for increasing HDL levels, and medication should only be used if these measures are not effective.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://pubmed.ncbi.nlm.nih.gov/17317371/
[3] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statins/art-20045772