Lipitor is a brand name for the drug atorvastatin, which is a medication used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], the most common side effects of Lipitor include muscle and joint pain, nausea, diarrhea, constipation, and headache. More serious side effects can include liver damage and an increased risk of developing diabetes.

Vitamin D is a nutrient that helps the body absorb calcium, which is essential for bone health. According to the Mayo Clinic [3], taking too much vitamin D can cause side effects such as nausea, vomiting, constipation, and weakness. Additionally, excessive vitamin D intake can lead to high levels of calcium in the blood, which can cause kidney damage and other health problems.

There is no known interaction between Lipitor and vitamin D, according to a study published in the Journal of Clinical Pharmacology [2]. However, it is always important to consult with a healthcare provider before taking any new medications or supplements, especially if you are already taking other medications or have underlying health conditions.

In conclusion, Lipitor and vitamin D can both cause side effects, but there is no known interaction between the two. As with any medication or supplement, it is important to talk to a healthcare provider before taking them to ensure that they are safe and appropriate for your individual needs.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://pubmed.ncbi.nlm.nih.gov/18754003/
[3] https://www.mayoclinic.org/drugs-supplements-vitamin-d/art-20363792