Hi, What can be the cause of tachycardia and high BP I am taking following medicines, metformin 500 mg - twice a day ,lipaglyn - once in morning, losartan 50 mg - twice a day, metoprolol 50 mgs - twice a day, amlodipine 5 mg - twice a day, prazolin 2.5 mg - once in night Now thyroid normal, and most conditions which had tachycardia and high BP as symptoms were normal ,now they are doing hynic TOC scan for pheochromocytoma though blood level for metanephranes were normal, my question is what are the causes of high BP and tachycardia? What diseases ,just want to know so increase my report come normal I can do those tests also can you suggest where can I do eps study of heart?Please Doctor suggested me.