Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood, while antihistamines are used to treat allergies. According to the sources provided, there are some precautions to take while using Lipitor and antihistamines together.

The NHS website [2] states that there are no known interactions between Lipitor and antihistamines, but it is still important to speak to a doctor or pharmacist before taking them together. This is because some antihistamines can cause drowsiness, and taking them with Lipitor may increase the risk of side effects such as muscle pain and weakness.

The Drug Patent Watch website [1] also mentions that some antihistamines can interact with other statins, which are similar to Lipitor. For example, taking the antihistamine terfenadine with a statin can cause a potentially life-threatening condition called rhabdomyolysis, which is the breakdown of muscle tissue.

ABC News [3] suggests that patients should always inform their doctor if they are taking any other medications, including antihistamines, before starting Lipitor. This is because some medications can interact with Lipitor and increase the risk of side effects.

In conclusion, while there are no known interactions between Lipitor and antihistamines, it is still important to speak to a doctor or pharmacist before taking them together. Some antihistamines can cause drowsiness, which may increase the risk of side effects such as muscle pain and weakness. It is also important to inform your doctor if you are taking any other medications before starting Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/conditions/statins/considerations/
[3] https://abcnews.go.com/Health/HeartDiseaseLivingWith/story?id=4224807