My Heart Rate Spikes on Synthroid Over the past 8 months I have noticed abnormal shortness of breath and 'spiking' heart rate while exerting myself or exercising. I was on dessicated t - 88% more...
Tangerine1-
over a year ago
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Synthroid
Forgot to add that normal resting pulse is around 55-60. Also, reason I increased synthroid from 100mcg to 125 was that my FT3 was lower than the midp - 66% more...