Just curious to know if any of you take Ziac (beta blocker) for high blood pressure and have a thyroid disorder? I've recently been told that the beta blocker may cause thyroid problems and may alter my tests.

Thanks for your help!

Which thyroid disease do you have?

The prescribing information given for Ziac says that if you have hyperthyroidism, you may not be able to take the drug. If you do, you will need more vigilant monitoring than someone without hyperT needs. Apparently, by making the heart beat more slowly, it masks the effects of high thyroid hormone levels. By inference, it would seem it could also mask the effect of too high a dose of medicine used for hypOthyroidism as well.

I have read articles by cardiologists who say beta blockers in general should be avoided by hypoT patients as well, since their hearts already tend to beat too slowly, and the beta blocker will exacerbate the effect.

Post the lab ranges for the T4 and T3, if you have them. Those values may be low, but I can't tell without the range.
Your TSH is way too high for someone who is taking thyroid hormone. A dose of .025 mg is considered to be a "non-dose". You are definitely undertreated, and the Ziac is making it feel worse. It's very probable that the hypoT is causing your blood pressure to be high, so if you would be properly dosed with thyroid med, the BP may drop on its own.

That doctor doesn't seem willing to acknowledge that he doesn't know what he's doing. You may have to fire him and find someone who knows something about thyroid.

Let me know if I can help more.

Quote from jjones2004:

Thanks! Here are the ranges for the Totals:
Total T3 - 2.5 (Range 0.6-1.8)
Total T4 - 9.4 (Range 6.5-10.5)
TSH - 3.778
(These tests results were done while taking 25 mg. Synthroid.)

Oh wow. I'm out of my league now and don't quite know what to tell you.
The TT4 is high enough in its range that it may or may not be OK. I'd still rather see a free T4 test in this case.
But the TT3 is above range.... I'm not sure how that happened, since your TSH is still so high. This is unusual.

Besides Synthroid and Ziac, are you taking any other meds, or have any other health conditions that may be altering the tests?

I hope some other members will join in here to suggest some possibilities; I'm a bit stumped now.