On 40mg of carbimazole and also 120mg of propra... - Thyroid UK

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On 40mg of carbimazole and also 120mg of propranolol for graves disease.

clottymum profile image
8 Replies

just over 7months now I was diagnosed with an over active thyroid (hyperthyroidism) I was initially put on 5mg of carbimazole and 120mg of propranolol my conditions got worse and so was told to up my carbimazole to 10mg, however that had no effect either so another 12weeks past and was told to go to 20mg. For 8weeks I was doin ok, not great but a lil better, I then developed severe stomach cramps which after test in hospital I was diagnosed with graves disease and told my cramps was due to my thyroid not being controlled and was told to up my carbimazole 40mg and return to hospital for blood test 2weeks later. I returned and was asked to return again the following week continuing with 40mg. Not much change so was then told to go up to 60mg they wasn't very happy about puttin me on such a high dose but my thyroid level was over 80 so they felt it appropriate. I returned the following week and my levels had halved so went back down to 40mg and weekly monitoring. I then saw a different specialist 5weeks ago who said to go back to 60mg as my levels wasn't any different and he will see me in 6weeks. 2weeks ago I had a hemiplegic migraine, lost feeling down my left hand side and was told it may be a result of my over active thyroid as it's still not under control but they didn't look any further into it and sent me home. I've since been very unwell, fever, headaches constantly, lack of sleep, severe diarrhea, shakes, very very emotional and just generally not well. I went back to my GP yesterday and he said I'm have a severe side effect of having such a high dose of carbimazole for such a long time without being monitored so he lowered my dose to 40mg, gave me tramadol for my headaches and said he will be in touch with my specialist to tell him.

I don't feel I'm getting anywhere with this and have spent 28yrs a very healthy person but I've never been so ill as I have in the last 7months. Anyone got any advice as to what I can do? Thank u x

8 Replies
Piedo profile image


I don t know if this is relevant but I read on this site in an answer by Dr Lowe that propranolol when taken with thyroxine negates the effect of the thyroxine.I wonder if this the same with carbimizole.


clottymum profile image
clottymum in reply to Piedo

Will look into it. Tnx. X

Valarian profile image
Valarian in reply to Piedo

Carbimazole is an anti-thyroid drug. Propranolol, a widely-used beta blocker, also has a mild anti-thyroid effect, so if anything would enhance the effect of carbimazole. It’s often prescribed for people who are hypERthyroid, to take the edge off their symptoms while waiting for carbimazole to take full effect, but may not be the best beta blocker for people who are hypOthyroid.

Clutter profile image

Has anyone suggested 50mcg Carbimazole might be a dose you could tolerate?

Possibly, carbimazole doesn't suit you and PTU, I think, is an alternative that might be trialled.

clottymum profile image
clottymum in reply to Clutter

Thank u I will certainly ask if it can be used iinstead. X

CharlS28 profile image

Hi Clottymum, it sounds like carb isn't working very well for you, and the headaches etc could be an allergic reaction to it. I also have graves and had an awful allergic reaction to carb so changed to PTU which works much better for me - might be worth asking your doctor if you can try it? x

clottymum profile image
clottymum in reply to CharlS28

Thank u I will ask endo when I attend nxt week if it's something I can try. X

ling profile image

Hi clottymum, can I ask how u are doing now?

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