Levothyroxine side effects : Hi! Just a note... - Thyroid UK

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Levothyroxine side effects

Northw profile image
9 Replies

Hi!

Just a note to say thanks, this forum has helped me not feel so alone whilst being unwell.

I started taking Levothyroxine in October in 50mg. In the first week I had awful dizziness and dropped it to 25mg and felt miles better. After a month at 25mg the dose was then upped to 50mg. Around this time I started I getting bloating, mood swings and anxiety I put this down to lifestyle not the tablets.

After some blood results, I was lifted to 75mg and suddenly all the symptoms/ side effects got exteme. Acid reflux, insomnia and anxiety.

I have deceived to stop taking the Levothyroxine and feel improved already, all gas has gone and have less anxiety.

Have anyone else had similar and how did you proceed with your treatment?

Cheers !

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Northw profile image
Northw
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FallingInReverse profile image
FallingInReverse

Have you shared the brands of your doses that gave you these reactions? One common explanation is that excipients are to blame.

edit!

Welcome to the forum! Apologies, your post read like a follow up to a previous but I now see you’ve been reading, but haven’t yet posted, here.

Can you share your blood tests with ranges? Tsh, ft4, ft3, any vitamins, any antibodies?

If you were properly prescribed Levothyroxine, then it’s very likely you need to take it for life. There are exceptions and we know nothing about you… and are only able to share our experience as fellow thyroid folks.

To do that , we need to know more about you!

Northw profile image
Northw in reply toFallingInReverse

Thanks for the reply ! Unfortunately due to not thinking the meds wasn’t the issue I binned all the boxes aside from the latest one. Which was TEVA brand.

I believe the others could have been mix of different brands over the time I’ve been taking it. But the extreme side effects appear to be from the TEVA.

Northw profile image
Northw in reply toNorthw

I will post the results of my bloods, just need to find them :)

SlowDragon profile image
SlowDragonAmbassador in reply toNorthw

Teva is well known for upsetting many many thyroid patients

Get new prescription for either Vencamil 75mcg

Or

50mcg plus 25mcg tablets

There’s lots of choices

Also get note added to all future prescriptions for Levo

“No Teva brand “

Many people find Levothyroxine brands are not interchangeable.

Most easily available (and often most easily tolerated) are Mercury Pharma or Accord

Mercury Pharma make 25mcg, 50mcg and 100mcg tablets 

Mercury Pharma also boxed as Eltroxin. Both often listed by company name on pharmacy database - Advanz

Accord only make 50mcg and 100mcg tablets. Accord is also boxed as Almus via Boots, 

Wockhardt is very well tolerated, but only available in 25mcg tablets. Some people remain on Wockhardt, taking their daily dose as a number of tablets 

July 2024

Crescent levothyroxine. Dosages: 12.5, 25, 50, 75, 100

(Not yet known if all approved dosages are or will be available).

Excipients: lactose monohydrate, maize starch, croscarmellose sodium, gelatin and magnesium stearate.

Lactose free brands - currently Vencamil or Teva

Vencamil is lactose free and mannitol free. originally only available as 100mcg only, but 25mcg, 50mcg and 75mcg tablets became available Sept 2024

Prior to March 2023 Vencamil was called Aristo

Vencamil often very well tolerated/best option for many people

How to get Vencamil stocked at your local pharmacy

healthunlocked.com/thyroidu...

Posts discussing Vencamil

healthunlocked.com/thyroidu...

healthunlocked.com/thyroidu....

Teva makes 12.5mcg 25mcg, 50mcg, 75mcg and 100mcg

Many patients do NOT get on well with Teva brand of Levothyroxine.

Teva is lactose free, but contains mannitol as a filler instead of lactose, which seems to be possible cause of problems. Mannitol seems to upset many people, it changes gut biome 

Helpful post about Teva

healthunlocked.com/thyroidu...

Posts that mention Teva

healthunlocked.com/search/p...

Teva poll

healthunlocked.com/thyroidu...

Relatively new ……Hillcross brand

This is a box, rather than a brand. 50mcg and 100mcg are Accord brand….but beware 25mcg is Teva brand

Helpful post about different brands

healthunlocked.com/thyroidu...

List of different brands available in U.K.

thyroiduk.org/if-you-are-hy...

Once you find a brand that suits you, best to make sure to only get that one at each prescription.

Watch out for brand change when dose is increased or at repeat prescription.

Government guidelines for GP in support of patients if you find it difficult/impossible to change brands

gov.uk/drug-safety-update/l...

If a patient reports persistent symptoms when switching between different levothyroxine tablet formulations, consider consistently prescribing a specific product known to be well tolerated by the patient.

academic.oup.com/jcem/artic...

Physicians should: 1) alert patients that preparations may be switched at the pharmacy; 2) encourage patients to ask to remain on the same preparation at every pharmacy refill; and 3) make sure patients understand the need to have their TSH retested and the potential for dosing readjusted every time their LT4 preparation is switched (18).

And here

pharmacymagazine.co.uk/clin...

Discussed here too

healthunlocked.com/thyroidu...

Northw profile image
Northw in reply toSlowDragon

That’s so helpful, thanks for your help!!

SlowDragon profile image
SlowDragonAmbassador in reply toNorthw

please add most recent test results and ranges

Plus test results from BEFORE starting on Levo

For full Thyroid evaluation you need TSH, FT4 and FT3 tested

Also both TPO and TG thyroid antibodies tested at least once to see if your hypothyroidism is autoimmune

Very important to test vitamin D, folate, ferritin and B12 at least once year minimum

Low vitamin levels are extremely common when hypothyroid, especially with autoimmune thyroid disease

About 90% of primary hypothyroidism is autoimmune thyroid disease, usually diagnosed by high TPO and/or high TG thyroid antibodies

Autoimmune thyroid disease with goitre is Hashimoto’s

Autoimmune thyroid disease without goitre is Ord’s thyroiditis.

Both are autoimmune and generally called Hashimoto’s.

Significant minority of Hashimoto’s patients only have high TG antibodies (thyroglobulin)

NHS only tests TG antibodies if TPO are high

20% of autoimmune thyroid patients never have high thyroid antibodies and ultrasound scan of thyroid can get diagnosis

In U.K. medics hardly ever refer to autoimmune thyroid disease as Hashimoto’s (or Ord’s thyroiditis)

Recommended that all thyroid blood tests early morning, ideally just before 9am, only drink water between waking and test and last dose levothyroxine 24 hours before test

This gives highest TSH, lowest FT4 and most consistent results. (Patient to patient tip)

Testing options and includes money off codes for private testing

thyroiduk.org/testing/

Medichecks Thyroid plus BOTH TPO and TG antibodies and vitamins

medichecks.com/products/adv...

Blue Horizon Thyroid Premium Gold includes BOTH TPO and TG antibodies, cortisol and vitamins

bluehorizonbloodtests.co.uk...

Medichecks and BH also offer private blood draw at clinic near you, or private nurse to your own home…..for an extra fee

Only do private testing early Monday or Tuesday morning.

Tips on how to do DIY finger prick test

support.medichecks.com/hc/e...

If you normally take levothyroxine at bedtime/in night ...adjust timings as follows prior to blood test

If testing Monday morning, delay Saturday evening dose levothyroxine until Sunday morning. Delay Sunday evening dose levothyroxine until after blood test on Monday morning. Take Monday evening dose levothyroxine as per normal

Northw profile image
Northw in reply toSlowDragon

Thanks for your help, I will post the results

FallingInReverse profile image
FallingInReverse

You can search “Teva” in the search function on this site and find many posts about people who react badly to Teva.

Here’s one recent discussion:

healthunlocked.com/thyroidu...

But it comes up regularly.

In the post I’ve linked above, there a suggestion to submit yellow cards - again, read through the post above nd you’ll see the link for that.

Others make sure to get their prescription noted as “No Teva” and they check every time they pick it up.

Northw profile image
Northw in reply toFallingInReverse

Thanks so much.

I will find my results and post them.

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