morad rafael,
Thanks for your question.
Lipitor (generic - atorvastatin) is a cholesterol lowering medication that lowers total cholesterol, LDL, and raises good cholesterol known as HDL. This is not a layered medication and it is "timed release".
There is no problem in breaking the pill to accommodate your prescribed dosing.
I hope this has been helpful.
Martin Cane, M.D.