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Switching from Cytomel only to Erfa

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Old 08-12-2012, 04:36 PM   #1
Join Date: Aug 2010
Location: Abbotsford, BC, Canada
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Switching from Cytomel only to Erfa

Hi everyone,

After two years trying Cytomel (T3 only) treatment, I've been able to find a naturopath to prescribe Erfa Thyroid for me to try. I had been on Armour early on in my treatment, but it was not covered by my insurance and I could not afford to stay on it. The dosing was also a little tricky, as I have Hashimoto's and felt quite a bit worse, quite quickly. Now, after much reading online, it's likely I was at too low a dose, too long, and my Hashi's flared up.

I have been on the Erfa for the last week and I've swung quite hypo. The ND prescribed too low of a dose, but he is fixing that up for me now after a long email exchange yesterday. Unfortunately, he's out of the office until Thursday, but he's phoning in a new prescription to the pharmacy on Monday.

I have been having bad headaches on waking (like a vice grip around my eyes) and the typical crashing fatigue and brain fog I get with a hypo swing. I am sleeping well, though, and am not too concerned about my adrenals. We've been using various supplements to support, and my daily temperatures are stable but still low, indicating thyroid rather than adrenal.

I have been taking 25 mcg Cytomel, 2 x a day for the last year. My labs are fairly stable but the FT3 and FT4 are both in the low end of the range - my FT4 has been below range a few times as well, which is likely from using T3 only.

I haven't been feeling terrible but not great either - just kind of coasting along. Still unable to lose weight and dealing with dry skin, loss of eyebrows.

The conversion charts show that 50 mcg of Cytomel would convert out to 200 of Synthroid or 2 grains of Natural Dessicated.

I'm on 30 mcg Erfa (1/2 grain) plus 12.5 mcg Cytomel, 2 x a day. Iniitally, the ND had me on just the 30 mcg Erfa. I'm pretty sure this isn't enough for me. the idea is to wean me off the Cytomel and just use the Erfa.

I think my sweet spot with the Cytomel is somewhere between 50 and 75 - when I was on 75, I went slightly hyper, but felt pretty good.

I am fairly sure that I will need somewhere between 2 and 3 grains of Erfa. How quickly can I dose up to that? I am already used to T3 in my system, so that's not really an issue. I live in Canada, so reverse T3 testing is not available to me.

Any advice would be very welcome!

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Old 08-13-2012, 11:16 AM   #2
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Re: Switching from Cytomel only to Erfa

I don't think the conversion charts are all that accurate.
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