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Old 05-20-2010, 11:00 AM   #1
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How Long Does It Take for Cytomel to Leave Your System?

Does anyone know how long it takes for Cytomel to leave your system completely? In an act of desperation, I bought some Cytomel on the net and have been taking 15 mg for the past three weeks with my Synthroid. Now I'm going to my doc for new labs in 10 days. Is that enough time for the Cytomel to clear out and show my normal T3 results (as affected by the Synthroid alone)? I've read that Cytomel has a half-life of 12-24 hours, but how long to be completely gone?? I know I need an increase in my Synthroid and I don't want the doc thinking the Synthroid is doing a better job than it really is.

Thanks for your help!

Last edited by celrelief; 05-20-2010 at 11:05 AM. Reason: added something I forgot

 
Old 05-20-2010, 01:03 PM   #2
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Re: How Long Does It Take for Cytomel to Leave Your System?

Guess it should be gone by that time but there's a possibility that your TSH is still lower than with plain T4 since it takes longer for TSH to "bounce back".

Last edited by FinnMaid; 05-20-2010 at 01:21 PM.

 
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Old 05-20-2010, 02:15 PM   #3
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Re: How Long Does It Take for Cytomel to Leave Your System?

Thanks, FinnMaid!

Any idea how long the TSH would take to bounce back to where it would be with the Synthroid only? I can put off going to the doc for a couple of weeks; he wanted to re-test after 90 days and it's only been 60 so far. I'd rather wait and get the most accurate results.

Thanks so much for your help!!

 
Old 05-20-2010, 10:03 PM   #4
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Re: How Long Does It Take for Cytomel to Leave Your System?

It can take about a month for TSH to "normalize". And there's a chance your FT4 could also be lower (because of that low TSH) than it would've been without Cytomel so waiting is a good idea.

 
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