Euthyroid means results are within range. You are euthyroid but FT3 is low in range which is why your endo has introduced T3.
20mcg T3 is equivalent to 60mcg T4 so your endo has effectively raised your dose. 20mcg T3 will raise your FT3. You can take your first 10mcg dose with 50mcg Levothyroxine and the second 10mcg dose at bedtime.
T3, like Levothyroxine, should be taken with water 1 hour before, or 2 hours after, food and drink, 2 hours away from other medication and supplements, and 4 hours away from calcium, iron, vitamin D supplements and oestrogen.
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