Levelthyroxine doses

[Annpenny11]

I had been taking 75mg of levelthyroxine for several months, then started to feel tired, after a blood test my dose was increased to 100mg. After a while I started to have heart palputations and feeling very anxious, I was advised to take 75mg one day and 100 the next. I felt all over the place, one day ok and then feeling tired. My doctor agreed that I could cut up the tablets so I could take the same amount each day. I am still feeling very anxious even after 4 weeks, so I am now on medication for anxiety. My question is, why would 25mg made such a difference to how I feel, I would have thought there would be a leaway between amount of doses.

[Annpenny11]

I'm new to this site, so have only just found your reply. Unfortunately I haven't got my results.
I was diagnosed with an under active thyroid over ten years ago, symptoms being tiredness, etc.
many thanks for your response.

[Annpenny11]

I'm new to this site, so have only found your answer. Thank you so much for your reply, I think I am still on too higher dose. I will have Togo back to my doctor. Thanks for your help.

[goolarra]

I've experienced a huge difference in how I feel with a 6.25 per day increase.  Some of us have more leeway than others.  

A 25 mcg increase on top of 75 mcg is a third more.  It's not as small as it initially sounds.

[gimel]

Please post your last few series of thyroid related test results and their reference ranges shown on the lab report.  What symptoms did you have before starting on the Levothyroxine?