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Old 01-22-2013, 02:44 AM   #1
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Time medication remains in body...

How long does thyroid medication remain in your body if no longer take it?

 
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Old 01-22-2013, 09:21 AM   #2
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Re: Time medication remains in body...

Levothyroxine (T4) has a half-life of about 7 days. That is, half of the last dose you take will be gone after 7 days. Half of the remainder in another 7 days, and so on.

Lioothyronine (T3) has a half-life of perhaps 1 day. Some say it's shorter than that, but on average, it would be so.
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Old 01-22-2013, 11:41 AM   #3
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Re: Time medication remains in body...

Thanks for your reply.

That explains why my eyes are puffy, my temp is 97.6, my pulse is 64, and other symptoms are bothering me, including a 4 pound weight gain. I haven't had any medication for 8 days.

And, the doctor expects me to wait 7 more weeks to have my thyroid tested??

I am glad I have an appointment, in two weeks, with another doctor.

 
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Old 01-22-2013, 11:56 AM   #4
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Re: Time medication remains in body...

Well... It doesn't exactly work that way. Even though your last dose may be half gone, it isn't as if it was working for you as soon as you took it. Your body operates on the stored T4 that converts to T3. The dose you take per day goes into storage for later use.

In simplest terms, it takes time... several weeks, probably... for the blood level of T4 to drop once you stop taking med. If I remember right, your FT3 was slightly above range. It would take maybe a week or more for it to drop into mid-range.

Good luck with the new doc!
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