Lipitor is a brand name for the drug atorvastatin, which is a type of medication known as a statin. Statins are used to lower cholesterol levels in the body, which can help reduce the risk of heart disease and stroke [3]. According to the sources provided, it can take several weeks or even months to see the full effects of a change in Lipitor dosage.

Drugpatentwatch.com [1] provides information on the patent status of Lipitor, but does not offer information on the drug's effectiveness. A study published in the Journal of Clinical Lipidology [2] suggests that patients who are prescribed a higher dose of atorvastatin may see a greater reduction in their LDL (low-density lipoprotein) cholesterol levels, which is a key marker of heart disease risk. However, the study notes that it can take up to 12 weeks to see the full effects of a dosage change.

The British Heart Foundation [3] also notes that it can take several weeks for statins like Lipitor to start working effectively. They recommend that patients continue to take their medication as prescribed, even if they do not see immediate results. It is important to follow the dosage instructions provided by a healthcare provider and to report any side effects or concerns about the medication to them.

In summary, while a change in Lipitor dosage may result in a greater reduction in LDL cholesterol levels, it can take several weeks or even months to see the full effects. Patients should continue to take their medication as prescribed and report any concerns to their healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4354082/
[3] https://www.bhf.org.uk/informationsupport/heart-matters-magazine/medical/drug-cabinet/statins