I'm sorry, but the sources you provided do not provide any information about how long an individual has been taking Lipitor at bedtime. However, I can provide you with some general information about Lipitor and its usage based on the sources you have provided.
Lipitor is a brand name for the drug atorvastatin, which is a type of medication known as a statin. Statins are commonly used to lower cholesterol levels in the blood, which can help reduce the risk of heart disease and stroke [3]. Lipitor was first approved by the US Food and Drug Administration (FDA) in 1996 [1].
According to a study published in the US National Library of Medicine, taking Lipitor at bedtime may be more effective at reducing cholesterol levels than taking it in the morning [2]. The study found that participants who took Lipitor at bedtime had significantly lower levels of LDL cholesterol (the "bad" cholesterol) than those who took it in the morning. However, the study only lasted for six weeks, so it is unclear how long someone would need to take Lipitor at bedtime to see long-term benefits.
The British Heart Foundation (BHF) recommends that people who are prescribed statins, including Lipitor, take them at the same time every day [3]. This can help ensure that the medication is effective and that the individual does not forget to take it. However, the BHF does not specify whether statins should be taken in the morning or at bedtime.
In summary, the sources you provided do not provide information about how long an individual should take Lipitor at bedtime. However, Lipitor is a statin medication commonly used to lower cholesterol levels, and taking it at bedtime may be more effective than taking it in the morning. The British Heart Foundation recommends taking statins at the same time every day, but does not specify whether they should be taken in the morning or at bedtime.
Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC214096/
[3] https://www.bhf.org.uk/informationsupport/heart-matters-magazine/medical/drug-cabinet/statins