Lipitor is a prescription drug used to lower cholesterol levels in the body [1]. According to the sources provided, there is no direct link between Lipitor and drowsiness when taken with antihistamines. However, some medications can cause drowsiness or fatigue, and it is important to be aware of potential side effects when taking multiple medications.

Antihistamines are commonly used to treat allergies and can cause drowsiness as a side effect. Some antihistamines, such as diphenhydramine, can also cause nightmares and disturbing dreams [2]. It is important to read the labels and instructions on medications and to talk to a healthcare provider before taking multiple medications, including Lipitor and antihistamines.

According to AARP, some medications can cause chronic fatigue as a side effect. This can include statins, the class of drugs that Lipitor belongs to [3]. However, it is important to note that not everyone will experience these side effects and that they may vary from person to person.

In conclusion, there is no direct link between Lipitor and drowsiness when taken with antihistamines. However, it is important to be aware of potential side effects when taking multiple medications and to talk to a healthcare provider before starting any new medications.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/drugs/side-effects/medications-that-cause-nightmares-and-disturbing-dreams
[3] https://www.aarp.org/health/drugs-supplements/info-06-2012/medications-that-cause-chronic-fatigue.html