Cytomel (T3) only or along with NDT (T3&T4)? - Thyroid UK

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Cytomel (T3) only or along with NDT (T3&T4)?

TJC123 profile image

How do i know if I'm to do Cytomel alone, or combine it with my Synthroid-S, which is a NDT comparable to Armor. Here are my labs:

TSH 2.37 (.40-4.5 mIU/L)

RT3 21 (8-25 ng/dL)

T3, Free 2.7 (2.3-4.2 pg/ml)

T3, Uptake 28 (22-35%)

T4, Free 1.0 (.8-1.8 ng/dL)

T4, Total 8.0 (4.5-12.0 mcg/dL)

T7 2.2 (1.4-3.8)

I figured my T3 to RT3 is at 12.9, so my dr. put me on Cytomel only 3 weeks ago. I haven't been feeling any better so far. Any advice? Thank you all.

9 Replies

If you have high reverse t3 its because the t4is being converted into rt3. If you stop taking the t4 for a while and survive on t3 only, then the rt3 should clear. Then you have to work out wht the t4 was turning into rt3 before goung back on it.

Never heard of synthroid s but synthyroid is the american equivalent of the uk version of thyroxine and its definitely not ndt... Ntd is made from dried pigs thyroid gland whereas synthroid is made purely from chemicals in a laboratory.

Who makes the synthroid s and whar are its ingredients?

Xx g

TJC123 profile image
TJC123 in reply to galathea

Thank you galathea for your response. I understand that T4 converts wrongly into RT3 and that RT3 needs to be cleared by using just the Cytomel alone. Is that what people are doing, using the Cytomel and then going back on a combo of NDT with Cytomel? How are they figuring their dosing? By how they feel or getting frequent labs done, I suppose, right?

I'd love to see a link to "synthroid-s". I've googled for it, and looked for it on but I can't find any links for it.

Can you tell us what the active ingredients of it are, please. I'm actually wondering if your doctor is conning you about what they are prescribing for you! Does it come in branded packaging? Does it have a patient information leaflet?

Ugh, sorry. I think it's called Thyroid-S by <company name> in Thailand.

humanbean profile image
humanbean in reply to TJC123

Ah! I understand now. Brain fog gets us all. :)

Are you hyper ou hypo

For tjc123

I don't understand your result ranges? Are you in uk?

helvella profile image
helvellaAdministrator in reply to Amers123456

View her profile - the original poster posted this in her first post:

I live in Texas, USA.

Which also explains the odd T7 and T3 uptake tests.

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