brands of T3

[Essexlil]

Hi, I’m trying to figure out if what I think is an autoimmune rash was triggered by the brand of T3 I last took. After years on T4 I found that the brand which most suited me was Mercury Pharma. When I started adding T3 in I was so grateful to have it prescribed I took what my local pharmacy could obtain. First was Roma - I seemed ok on that. Then Mercury Pharma - better on that. My last was Morningside and for the 6 months I took it my skin on my arms, chest and upper back broke out in a mixture of sore red patches which broke open and red itchy spots which when scratched bled quite a bit then scabbed over. I’ve just received my latest T3 from Quincy (thanks to Thyroid UK) and unlike my local pharmacy they could obtain Mercury Pharma for me. I’ve switched onto this brand for the last few days and my rash is looking like it’s clearing up. I’d like to figure this out as, typically Mercury Pharma seem to be the most expensive but it’s worth the extra if my rash clears up and I’ll ask my endo to name it on my prescription.

Thank you for reading and if anyone else has had a similar experience it’ll help confirm my suspicion so I’ll stick to Mercury Pharma in the future.

[helvella Administrator]

You can see details of all UK products in my document. That includes declared ingredients and prices. Just meant to make information available to you!

helvella - Thyroid Hormone Medicines - UK

The UK document contains up-to-date versions of the Summary Matrixes for levothyroxine tablets, oral solutions and liothyronine available in the UK. Includes injectables and descriptions of tablet markings which allow identification. Latest updates include all declared ingredients for all UK-licensed products and links to Patient Information Leaflets, Dictionary of Medicines and Devices (dm+d), British National Formulary, NHS Drug Tariff, etc. PLUS how to write prescriptions in Appendix F.

Now also includes latest pricing information from dm+d..

Also includes links for anti-thyroid medicines (but not product details).

Direct link to PDF:

📄 dropbox.com/s/bo2jzxucgp9hl...

Blog last updated 28/12/2024 - documents are regularly updated

[SlowDragon Ambassador]

Different brands have different fillers

Download list via link in email

thyroiduk.org/contact-us/li...

[Essexlil in reply to SlowDragon]

Thank you I’ll go on link now

[Kava3]

Hi.I recently had the same problem when my T3 brand with switched. Same rash as you're describing I'm in the US and my brand was Dr Reddy's Laboratories that I had the allergic reaction to. I did look up the ingredients and there was a lot more fillers then what the other T3 had that I had been taking with no issues.

So I did have the pharmacy note in my file not to give me that brand in the future and the doctor also noted on the prescription moving forward. Hope that helps!

[Essexlil in reply to Kava3]

hi Kava,

Thank you so much for replying - it really helps me to understand this horrible rash. I didn’t link it to the T3 brand for some reason until I had a new prescription but after a few days on a different brand of my choice, for the first time in months the rash seems to be easing up.

[helvella Administrator in reply to Kava3]

Dr Reddy's Liothyronine:

calcium sulfate, unspecified form (UNII: WAT0DDB505)

microcrystalline cellulose (UNII: OP1R32D61U)

hypromellose, unspecified (UNII: 3NXW29V3WO)

talc (UNII: 7SEV7J4R1U)

silicon dioxide (UNII: ETJ7Z6XBU4)

dailymed.nlm.nih.gov/dailym...

Morningside Liothyronine:

Lactose monohydrate,

Partially pregelatinized maize starch,

Spray dried acacia,

Sodium chloride,

Magnesium stearate.

📄 dropbox.com/s/bo2jzxucgp9hl...

Nothing in common except the active ingredient and maize derivates (probably in the case of Dr Reddy's).

[Kava3]

No problem! Glad I could help! Look up the fillers in both brands and the ingredients. We have to do our own detective work these days! Take care!

[Essexlil in reply to Kava3]

Yes I’ll compare them to see if I can understand what I’m seemingly allergic to - thank you

[helvella Administrator]

Please put in a Yellow Card report;

🟨 Making Yellow Card Reports 🟨

healthunlocked.com/thyroidu...

The Thyroid UK document is incomplete and does not include Sigmapharm/Viatris and Strides liothyronine. I am not aware of any source that includes ALL current UK thyroid hormone approved medicines other than my document:

📄 dropbox.com/s/bo2jzxucgp9hl...

[Essexlil in reply to helvella]

Hi and thank you for your help. I’ve looked up both brands of T3 but don’t know enough about the ingredients to know which one may have caused my rash. Here’s a photo of each one if anyone knows more about the ingredients who can help please. Thank you for putting all of this information together for us as it makes it so much easier to compare. I’ll do a yellow card report if the rash clears up as it’s still lurking.

This is I think Mercury Pharma one which seems to suit me

[helvella Administrator in reply to Essexlil]

It is very difficult having any certainty but the ingredient of Morningside that is most obviously questionable (to me!) is Spray dried acacia.

[Essexlil in reply to helvella]

Whereas Advanz has acacia powder - maybe a different process?

[helvella Administrator in reply to Essexlil]

No - the acacia in Mercury Pharma is ALSO just as questionable!

But one of the issues with acacia is that there are several sources and the differences could be significant.

[Essexlil in reply to helvella]

Oh ok I understand - sounds like you’ve found the mystery because I wouldn’t have a clue about the sources - thank you so much your knowledge is amazing!

[helvella Administrator in reply to Essexlil]

None of us do have any idea!

It could change from one batch to the next.