Thyroid UK
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Dosage Help

Hi all,

As you've probably gathered I've been self- medicating with T3 for 2 months now, you've all been wonderfully supportive in giving me the confidence to take my health into my own hands, so thank you all for your advice so far.

Previously, I was on 150mcg Levothyroxine for about 16 years. For the past 4 weeks I've been taking 12.5mcg Liothyronine and 100mcg Levothyroxine. Had my bloods done 3 days ago, G.P still refuses to test T3 and got these results:

TSH: <o.o5

T4 - 12

My G.p is now saying he wants to reduce my Levo due to the TSH score. I've actually never felt better since adding the T3 but could definitely still feel better. Should I reduce the Levo and increase the T3? Any advice greatly appreciated.

4 Replies


TSH is often suppressed when taking T3 and doesn't indicate over medication unless FT4 and FT3 are above range. Without seeing a FT3 result it's not likely anyone can advise whether to increase T3 or reduce Levothyroxine. You can order a private thyroid test from Blue Horizon or Genova via

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As t3 is the active hormone it suppresses TSH. You really need your free t3 to be able to see if you are optimally medicated. Does your GP know you are taking t3? If yes ask him how he can suggest a dosage reduction without all the relevant blood results. He/she will only have been taught about TSH and levothyroxine and unless interested will not have educated themselves further. Good luck.

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I'm a bit concerned about telling my G.P I'm self-medicating with tablets I bought online. Think I'll probably just get a thorough telling off!


My GP wasn't happy but without the info he can't interpret the blood results correctly and will try to reduce your Levo. I pay for blue horizon bloods to check free t3. If you can do that and then post your results here some of the helpful people will be able to advise.

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