I'm having knee replacement surgery and need to know if any of my meds are blood thinners as I need to stop them. Meds: lipitor, norvasc, xanex, perocet, glipizide, fenofibrate, synthroid, lisin/hctz,gabapentin, aspirin 81mg. My name is Alice Scalici and would appreciate you helping me with the meds I need to stop or not. Thank You