Lipitor, which contains the active ingredient atorvastatin, is a medication used to lower cholesterol levels in the blood. It is generally safe to take with allergy medication, but there are some potential side effects to be aware of.

According to the NHS [2], the most common side effects of atorvastatin include headaches, muscle and joint pain, and digestive problems such as constipation, diarrhea, and indigestion. These side effects are usually mild and go away on their own, but if they persist or become severe, it is important to speak with a doctor.

In addition to these common side effects, there are some more serious side effects that can occur with atorvastatin. Medical News Today [3] reports that these can include liver problems, muscle damage, and an increased risk of diabetes. It is important to be aware of these potential side effects and to speak with a doctor if you experience any symptoms such as dark urine, yellowing of the skin or eyes, unexplained muscle pain or weakness, or excessive thirst or hunger.

It is also important to note that atorvastatin can interact with other medications, including some allergy medications. Drug Patent Watch [1] notes that atorvastatin should not be taken with certain antifungal medications, such as itraconazole and ketoconazole, as well as certain antibiotics, such as erythromycin and clarithromycin. These medications can increase the levels of atorvastatin in the blood, which can increase the risk of side effects.

In conclusion, while it is generally safe to take Lipitor with allergy medication, there are potential side effects to be aware of. Common side effects include headaches, muscle and joint pain, and digestive problems, while more serious side effects can include liver problems, muscle damage, and an increased risk of diabetes. It is important to speak with a doctor if you experience any symptoms or if you are taking other medications that may interact with atorvastatin.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.medicalnewstoday.com/articles/drugs-lipitor-side-effects