Levothyroxine dose

[grace1946]

I made a mistake with my dosage box and accidentally took four days of 200mcg Levothyroxine instead of 100mcg about 6 weeks ago. Will this affect thyroid function tests I have just had taken?

[helvella Administrator Thyroid UK]

Relax.

Water under the bridge and extremely unlikely to have had any lasting effect.

Did you feel any different when you did that?

[grace1946 in reply to helvella]

No I didn't, but I have just been told I to arrange a telephone review with my GP re my thyroid results. I have been on this dose for 36 years and am worried the double dose I took then has affected the test results. I had a 10 week reducing course of Prednisolone previous to this, hence the confusion with my two dosage boxes (I kept the Prednisolone one completely separate though) I feel so stupid about doing it I didn't tell anyone at the time.

[helvella Administrator Thyroid UK in reply to grace1946]

We all do feel stupid when we make mistakes that should be avoidable!

Really is not a big thing (so long as you didn't feel bad at the time).

It is usual to suggest that it takes about six weeks after a dose change to end up with stable blood test results. Just four days would really be nothing that long ago.

[grace1946 in reply to helvella]

Thank you for your reassuring answer, it is really much appreciated. I developed thyroid problems after the birth of my daughter who is now 40, and she is now waiting for results of her thyroid tests as having symptoms. History repeating itself. Thanks again for your help.

[SeasideSusie Remembering in reply to grace1946]

grace1946

I have just been told I to arrange a telephone review with my GP re my thyroid results.

If there is any problem with your GP suggesting you reduce your dose due to overmedication, just explain what happened and ask to repeat the test in, say, 6 weeks' time (or whatever time scale is appropriate).

[Hylda2]

I did exactly the same. Did ring arrhythmia nurse and was given a barrage of tests but everything fine.

[Eliotf]

I don't think so. T4 has a half life of 6-7 days. So most things should even out. BUT you should still tell your dr. what happened

[grace1946 in reply to Eliotf]

Thank you for that reassurance, I will tell my Doctor, they shouldn't scold me too much as first time have done this in 36 years and I was very unwell at the time.

[Eliotf in reply to grace1946]

Yes, I am as dx for thyroid issues in 1992 & have been fairly steady. But when I was doing traditional chemotherapy in 2016 for leukemia, my thyroid tests were extremely out of wack so I am still not sure how much of my feeling bad was chemotherapy or thyroid being wacked out