Thyroid Medication Options

Although most conventional doctors will not tell you, there are more options for treating your thyroid than just T4-only medication such as Levothyroxine or Synthroid. In fact, a lot of conventional doctors don’t even seem to be aware that they can treat hypothyroidism with more than just synthetic T4-only drugs.

So, what’s the difference?

Well, a healthy thyroid gland would be giving you five hormones you need and these are: T1, T2, T3, T4 and Calcitonin. T1 is thought to play a role in keeping your thyroid function in check and also is believed to influence the heart. T2 likely plays a role in converting T4 to T3, which is very important and a reason why so many patients don’t feel much better on T4 only medicine, but more on that later. It also likely has an impact on metabolism and burning fat and is effective in increasing liver metabolism and that of the heart. Referred to as the ‘active hormone’, T3 has the greatest effect on the body’s energy levels and overall health and well-being. It is more active than T4. T3 is said to be linked to mental health, ability to coping with stress and emotional stability. T4 is referred to as the ‘storage hormone’ and its main function is to convert to T3, both active T3 and reverse T3. T4 is involved in brain function also. Calcitonin is secreted from the thyroid when blood levels are high in Calcium. It acts to lower levels of Calcium in the blood and stops the release of more Calcium from your bones into the blood. Because of this, it’s said to be effective in the prevention of osteoporosis. Now, the thyroid gland does produce all of these hormones itself but some of the T4 it produces is also converted into that very important T3 in the liver and T3 is the active thyroid hormone; the one that gives you energy and removes hypothyroid symptoms.

So, you can see why it may be beneficial to take a thyroid medication that replaces all or at least the two most important (T3 and T4) of these thyroid hormones, when our thyroid glands go caput and we develop hypothyroidism. Well, a lot of conventional medicine practitioners would not agree.

T4-only Meds

Most conventional doctors believe that we only need to replace the T4, as we only require tiny amounts of T1, T2 and Calcitonin anyway, and our body will convert some of the T4 to T3, to replace that thyroid hormone. That seems simple enough, right? Wrong. While some people do do well on T4-only meds, such as Levothyroxine and Synthroid, many other thyroid patients fail to convert the T4 in to T3, so when they take T4-only meds, they still feel rubbish.

A conversion issue can be caused by an enzyme called iodothyronine deiodinase that is either deficient or not compatible for some people and is important in the activation and deactivation of thyroid hormones. T4 is converted into T3 by deiodinase activity.  A problem with this can therefore cause conversion issues, where TSH can look ‘fine’, as well as Free T4, but with a low Free T3 and continued hypothyroid symptoms and development of other health conditions (such as mental health and heart/blood pressure problems).

Another cause could be adrenal fatigue, or vitamin deficiencies such as iron or selenium. By addressing these, you may fix the conversion problem, but many other people simply have a problem converting and don’t know why. So simply, they will likely benefit from taking a thyroid medication that gives them direct T3, instead of relying on their body to convert the T4 they put into T3 for them.

It still baffles me why doctors think that someone with an already rubbish thyroid, a body not functioning properly, will be able to convert T4 to T3 without a problem. Where is the logic in that? I just think it makes so much more sense to skip having to rely on conversion happening and just give the body readily available T3.

But doctors do have their reasons for refusing this logic. I’ll cover that later on.

T3-only Meds

Instead of being on T4-only, you could be on T3-only medication which skips that conversion stage. But as you have no T4 (the storage hormone) to convert to T3 for you, you have to dose it more often, such as 3 or even 4 times a day. Still, many thyroid patients do feel an improvement over being on T4 medication alone.

T3 and T4 combination.

There is also the option of taking both T4 and T3 together, to try and mimic more closely what the thyroid gland would be putting out, if it was working properly. Thyroid patients who have tried this do often report much better results than using T4-only on its own, as it gives you that direct T3 and doesn’t rely on your body converting it. Both of these are synthetic hormones though (made by chemical synthesis to imitate a natural product) so for some, don’t quite work as well as Natural Desiccated Thyroid which is up next.


Natural Desiccated Thyroid is most often dried porcine (pig) thyroid gland and gives you exactly what your own thyroid would be giving you; T1, T2, T3, T4 and Calcitonin.  A lot of patients who’ve tried T4-only medicine, T4 and T3 together, or even just T3 on its own, say they have even better results with NDT because of how close its makeup is to that of our own thyroid glands. Most people dose NDT twice a day, taking half their dose in the morning and the other half mid-afternoon. It’s removes the need to rely on the body converting hormones and honestly, just makes the most sense to not only myself but many other thyroid advocates, thyroid charities and functional medicine doctors the world over, who are campaigning for better hypothyroidism treatment so that patients can live better quality lives. Obviously NDT is a tricky decision for thyroid patients who are vegetarian or otherwise do not eat meat, but it’s all down to your personal situation. Over the counter bovine NDT can also be found for those who cannot eat pork.

Now, you may have read all of that and thought “Brilliant. How do I change to this NDT medication?” Well, the hardest part is trying to get your doctor to prescribe anything other than T4-only medicine, sadly. The vast majority of conventional doctors have been trained to stick to T4 synthetics, so many patients these days are unfortunately having to go private or self-source it, just to get the medication they need to function like a normal human being. After seeing numerous NHS GP’s here in England and having it refused again and again, I eventually turned to self-sourcing my NDT and let me tell you – it’s no easy decision.

Of course, it can be risky. Of course, buying any medication online isn’t ideal. And of course, you must be so clued up and well read in how to use such medication if your doctor has no idea how to dose it. But I can’t deny that it’s changed my life – heck, even saved my life – and the effects NDT has had on me has even changed my own GP’s idea on the medication. He happily supports me using it and monitors me with regular full thyroid panel tests but he won’t prescribe it still.

But don’t get me wrong, I’m not suggesting that NDT is the only way forward, and some thyroid patients do do well on T4-only meds, but the problem is that doctors need to be treating patients based on their own individual needs, symptoms and reaction to medication. The best thyroid medicine is the one that works best for that particular person. This should include T3 and NDT medicine.

If you’re vegetarian, read this article. It covers bovine (cow) NDT options.

The hardest part is getting your doctor to prescribe anything other than T4-only medicine, so you may need to go private or self-source, like I have done with NDT. However, this can be risky, so I would always suggest working with a doctor to make any change to your health regime, where possible.

Stop The Thyroid Madness cover all the different brands and ingredients of NDT, here.

If you are not feeling well despite being on thyroid medication, it could be because your test results are in the “normal” range but not at the “optimal” level for you. 

You can click on the hyperlinks in the above post to learn more and see references to information give. Also see these links:

Written by Rachel, The Invisible Hypothyroidism

Rachel is a Thyroid Patient Advocate and Expert with Six WEGO Award Nominations, a highly ranked writer appearing in the Top Hypothyroidism Websites and Top Thyroid Websites 2018. Currently studying to become a Life Coach, she has worked with The National Academy of Hypothyroidism, The BBC, The Mighty, Dr. Hedberg, Thyroid UK and ThyroidChange, to name just a few. She is well recognised as a trusted and useful contributor to the thyroid community and has relevant qualifications and certificates in Diet and Nutrition, Reflexology, Motivational Speaking and Positive Thinking.

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