My 73 yr old mother has a hx of cva x 2 episodes and an mi. Her current meds are lamotrigine 200 mg bid, carvededilol 3.125 mg 1/2 tab bid. Escitalopram 10 mg daily, crestor 5 mg daily, warfarin 6 mg q evening. Otc meds are fish oil, mv, co q-10, tylenol, l-lysine, d3, zantac. She has had nausea and vomiting daily for past 8-10 days. Is c/o weakness, and her ability to ambulate has decreased significantly. She c/o her legs hurting and not working right . Should we have any kind of levels done for possible med toxicity or interaction.