When I was prescribed T3 20mcg my Levo was reduced by 50mcg so that would seem to be what they do. I take my T3 in one go with the Levo early morning. I have been fine doing this but everyone is different and some people prefer to split the dose. Hope it makes a difference for you.
20mcg T3 is equivalent to 60mcg Levothyroxine so you've had a 10mcg dose increase.
Buy a pillcutter from your local pharmacy because the T3 tablets are tiny and fiddly to halve. You can take the 1st 10mcg T3 dose with 50mcg Levothyroxine and take the second 10mcg T3 dose at bedtime.
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