... increase in heart rate after an injection that is sometimes reported. I am talking about ongoing, diagnosed tachycardia from no known reason - i.e. a cardiologist approves of my heart and arteries after pet scan, echos, stress test, etc etc. but my heart rate will now go as high as 120 bpm from just walking across the room or 140 bpm from taking a shower or taking out the trash. I was prescribed a beta blocker to slow my heart. I developed the tachycardia after 14 months of taking Forteo, stopped taking Forteo after 16 months and have been off of it for four months and still have the tachycardia. Am just wondering if the Forteo caused it and wonder if anyone else developed tachycardia after taking Forteo.