Just been diagnosed with subclinical hyperthyroidism and prescribed with - 10 mgs carbimazole. I have had many symptoms for 15 years or so but never been given medication before. I've been reading about the weight gain caused by carbimazole and I'm very reluctant to start, as I have a constant struggle with my weight.
Are there any alternatives to these meds which don't cause weight gain? My T3+4 are normal but my TSH is low and feeling faint and shakey has worsened recently. Apparently I now have a fast heart rate but I've never had this before.
Cheers Angi
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angie-m-b
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As I understand, the issue is not that carbimazole itself cause weight gain, but that low thyroid hormones levels can do so. We do get people who have been started on carbimazole and left on their relatively high starting dose for a long time. So, instead of the thyroid hormone levels dropping to a sensible level and then the carbimazole reduced, they are left while the thyroid hormone levels drop too far.
I am somewhat surprised at you getting carbimazole with subclinical hyperthyroidism and "normal" T3 and T4. Have you got your actual results - and their reference ranges? (We get very suspicious of the word "normal" having seen it used to cover almost any result!)
Are you taking any other medicines or supplements?
If your T4 and T3 are normal perhaps it's not your thyroid that's causing your symptoms. There are other reasons for a low TSH. Have they tested your pituitary function just to be on the safe side?
If you are having difficulty with your weight, I am surprised they think it's hyperthyroidism. If you were losing weight without trying I might start thinking hyperthyroidism, but you mention you are having trouble with weight gain. I wonder if there is something else going on here.
By the way, I'm not a doctor and have no medical training; these are just questions I'd want to be asking if I were in your shoes.
I would definitely want a proper diagnosis with evidence of raised antibodies, before considering carbimazole..... The fast heart rate alone is not really indicative of anything much.... ( mine goes faster if I get a cold.).....
Have you any symptoms of hyperthyroidism, like a tremor, heat intolerance, weight loss despite eating, racing thoughts, ?
The fact that your pituary is producing low levels of tsh does not mean that you are hyperthyroid...... it could be that you have a problem with the pituary. The doctor will try and rubbish this, but recent studies show that there is a genetic reason why some people don't make enough tsh....
although this may not be relative to you (it generally affects men), it does show that the idea that the tsh is a reliable indicator of thyroid status, is pure fantasy.
I've been hyper- and hypothyroid and to be honest when I was hyper I lost large amounts of weight so the weight issue on Carbimazole was not a worry. Do you have a ravenous appetite? Sometimes hyperthyroid patients can gain a little weight rather than losing it, but I am not sure about 'sub-clinical hyperthyroidism'. What I DO know is that the carbimazole is being used to try to prevent the onset of more obvious hyperthyroidism. At the levels you are being given it, weight gain may not be an increased problem, but if you try to keep as active as possible (tough I know!) it could help.
Was it the GP who prescribed carbimazole? I would have thought that a referral to an endocrinologist with low TSH and 'normal' T3 and 4 would be the very least that should happen.
Hi the simple answer is that until you know otheriwse, you are hyper and must take anti thyroid meds. There are but two choices and carbimazole is one of them. 10 mgs is quite a low/reasonable dose. Some are put on as much as 40 to start.
You must come to terms with the fact that if you are indeed hyper then it must be treated and unfortunately your weight is not a good enough reason to stop taking meds. i sympathise as I am a hyper and on carbimazole and have weight issues BUT this is not a simple health issue. It is a serious and complicated health issue which untreated acan make you very ill.
By all means do as others have suggested do ask questions and ask for more info and tests but do take your meds and please research hyperthyroidism to see the consequences of ignoring it.
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