Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. According to the sources provided, there is no specific information on how long before swimming one should take Lipitor. However, there are some general guidelines that can be followed.

Firstly, it is important to note that Lipitor can cause muscle damage, which can be exacerbated by physical activity such as swimming [3]. Therefore, it is recommended to consult with a healthcare provider before starting any exercise regimen while taking Lipitor.

Secondly, Lipitor can increase sensitivity to sunlight, which can increase the risk of sunburn [2]. Therefore, it is recommended to avoid prolonged sun exposure and to use protective clothing and sunscreen when outdoors.

Lastly, according to Drug Patent Watch [1], Lipitor is typically taken once a day, at any time of day, with or without food. Therefore, there is no specific time frame for when to take Lipitor in relation to swimming.

In conclusion, while there is no specific information on how long before swimming one should take Lipitor, it is important to consult with a healthcare provider before starting any exercise regimen while taking Lipitor, to avoid prolonged sun exposure and to use protective clothing and sunscreen when outdoors, and to take Lipitor once a day at any time of day, with or without food.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.fda.gov/drugs/special-features/sun-and-your-medicine
[3] https://pubmed.ncbi.nlm.nih.gov/25093910/