5.9 or higher is about where you want your free t3 to be if taking T3. If anything I'd decrease T4. Impossible to say how much your T3 would decrease by. Mine changed very little until I was taking 25mcg. Other people find just a little makes a difference. It took six months or more for my palps to decrease (or perhaps I just got used to them). If palsps worry you, ask for a referral to cardiology for a 24 hour Holter monitor
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