Recall of T3 tablets — 5 mcg. by Paddock Laboratories

Though this page was written in 2010, it has been updated to the present day and time. Enjoy!

After the turn of the century and within groups associated with Stop the Thyroid Madness, thyroid patients made a huge discovery–that many of them had an RT3 problem!

RT3 is the acronym for Reverse T3. Reverse T3 production is normal. It will occur if you have surgery, after a bodily accident, when having the flu and/or other stressful conditions. It’s your body’s way of moving out the excess T4 by converting it to more and more RT3, which in turn, lowers your metabolism.

But when thyroid patients have either low iron or a cortisol problem, up goes the Reverse T3. And why is that a problem? RT3 is not only inactive, but you might say it’s a T3 “antagonist”, binding to the same cellular receptor that T3 would have attached to, but now can’t. Thus, T3 will rise higher and higher in the blood–a condition we call pooling.

So what did patients learn to do? Find out the reason and treat it…and in the meantime, they lowered the RT3 by lowering the amount of T4 they were getting, or by being on straight T3.

And in 2010 came recall of one of the brands of T3 by Paddock.

Liothyronine Sodium Tablets, USP 5 mcg, RX only, Net contents 100 tablets, NDC0574-0220-01, UPC code (01) 00305740220016. Recall # D-695-2010
Lot # 9C548
Recalling Firm: Paddock Laboratories, Inc., Minneapolis, MN, by letter dated May 18, 2010.
Manufacturer: Metrics Inc., Greenville, NC. Firm initiated recall is ongoing.
The recall is being conducted due to a stability failure at the 12 month timepoint; the assay value of this lot was found to be sub-potent.
11,064 bottles
Nationwide including DC and PR

Luckily, as the years went by, there continued to be other brands of T3 and new brands.


  • Want to learn more about RT3 and the problems it can cause you?? You can read about it here on STTM’s Reverse T3 page, plus more details in the STTM book chapter on T3.
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  • Need other thyroid patients to talk to? Go to the Talk to Others page.
  • Have questions about what thyroid patients have learned? Check out the Question and Answers page.

5 Responses to “Recall of T3 tablets — 5 mcg. by Paddock Laboratories”

  1. Ed Mashek

    Well this is just wonderful. I was on that at the time. So what are we as patients supposed to do about this? Seems if they were giving us bad medication something should be done about it, or at the very least given a refund.

  2. Julie

    This medication has a filler in it that gives me heart arrhythmias. I have a really hard time making sure my pharmacy orders from a different lab.

  3. Sue

    I love this brand. The paddock/perrigo brand is the only one I don’t have a reaction to. For a while I was on a dose that required a half pill and these are terrible to cut in half, they just crumble, but at least they work. I have to make sure my pharmacy orders the perrigo/paddock brand for me. If I don’t ask, they send me Sigmapharm, which is terrible for me. The fillers they use caused a terrible reaction – it started about 6 weeks after my first pill. By the way, the Sigmapharm are very easy to cut in half, but did not agree with me. I first had hormonal acne along my chin line – odd since I never had acne, even as a teen. I didn’t realize the cause so I kept taking the pills for 4 months. By the time I stopped taking them…and for months until my body recovered….I had awful cystic acne, my hair looked great, I had a terrible time keeping my weight normal and I am already too thin, I was getting hot flashes and yet was still cold all the time. I couldn’t think clearly and my emotional state was just crazy. I couldn’t take any stress at all, I always felt uptight and my asthma was out of control. I was panting (not as dramatic as a dog, but panting) and just could never catch my breath. It was awful. Then once I stopped it took about 2-3 months for my body to recover and things to go back to normal. It was awful for me on that brand. The brand of generic DOES matter and some mfg do use fillers that cause reactions of all types. Once I was on a generic birth control pill that caused hives, but other brands of generic (mfg) did not. The point to my story is that one generic is not always the same as another so it can be worthwhile to try different mfg if a particular drug causes side effects.

    • JB

      Sue … I had the same problem when my 90-day went to sigmapharm from paddox generic. I had to pay for brand name, now I’m finding out that paddox is called perrigo, so I’m going to have dr write DAW for perrigo generic only. Express scripts says they will fill it that way then. Luckily I kept the old bottle that listed the pill mark number and the Express script pharmacist was able to tell it is now mfg/distributed by perrigo. I also felt horrible when I went to sigmapharm and it took me a couple of months to figure it out, it made me feel anxious and I had tinnitus really bad.

    • TheRealDeal

      Is the Sigma Pharm brand not gluten free? I have been taking it.

      I tried the Paddock generic, and while it is gluten free, I felt such a drastic change vs. the brand Cytomel, that I stopped taking Paddock. As in, I felt like I didn’t take anything. I felt sluggish and horrible. It just didn’t work for me 🙁 I also tried to take it sublingually and the tablet would just crumble and it was so powdery.


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