Confused about T3 dose and need advice

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On Sunday, I started Cytomel (started with generic -- switched to brand name on Tuesday) after being on an T3/T4 slow release comb. equivalent to 2 grains of Armour. So, I am 5 days into T3 only. According to the dosing chart, I should start with 25mcg and spread it throughout the day. I have tried doing this, but my chest has been very tight and my heart seems to race at times. My pulse increases to higher than is comfortable for me -- when mine gets into the 80 bpm range -- that is when my heart feels funny and fluttery. I keep dropping my dose back and spreading it out -- am down to 18.75 mcg per day (6.25 mcg per dose) and still having these sypmtoms. Am confused because don't know if I have just started with too high a

dose of T3 or if I should consider some other reason for intolerance given that 25 mcg should seem to be a reasonable starting dose. Am wondering if I should get a Cytomel prescription for 5 mcg/ 5 times per day? The heart stuff scares me. I am in very good physical shape as I run 5-6 miles 6 days a week. Any thoughts? My original FT3/RT3 ratio was 10. When my pulse is up, my temps do seem to go up also.

Any help is appreciated.

Thanks,

Beth

Thanks,

Beth