How long does Synthroid take to work?

[ipad135]

I just took my second dose of Synthroid this morning (25 mcg). I still feel the same. When should I see improvement?

Thanks!

[tinat7]

I have hypothyroidism (was diagnosed about 15 years ago) and in the past year I started cutting back my synthroid dose because I was having uncomfortable symptoms which I associate with taking too much synthroid (such as feeling shaky and like I can't stay still and the only thing that can slow me down is eating a ton of food). I had my TSH checked in January (9.2), March (8.5) and August (last week) (7.5) and have been gradually upping my dose to get back into the normal TSH range without the yucky symptoms I had last fall. A few days ago I started having that familiar nausea of pregnancy and am now a day late on my period. It has been about 14 days since conception and now I'm very worried about going into the first trimester of a pregnancy with an elevated TSH. I have two normal healthy children but during those pregnancies my TSH was normal at the start and my OB continued to monitor it during that time. For years I was on 88mcg levothyroxine but since last December I cut my dose back a lot. In the past few months I have been taking 50mcg every other day and 44 mcg every other day. Now, I know I need to increase my dose but am wondering how much I should increase it to make sure that I lower my TSH as soon as possible for the pregnancy. If anyone has experience with this, please let me know. I have been reading all these articles about the effects of elevated TSH during the first trimester and mental retardation and low IQ in infants and it is making me feel pretty upset.

[JMcKale]

I started experiencing transient side effects in the first week and it took me 3 weeks to notice a lessening of my symptoms.

The first thing to disappear was the cold intolerance.

[Thyroid4]

Hi ipad135, just wondering whether taking the synthroid helped with your symptoms when you had "normal labs". I have almost exactly the same thyroid levels but have very high Thyroid antibodies (close to 250). I've been having various hypo symptoms like cold intolerance, fatigue, muscle weakness and (most troubling) a swollen tongue (which apparently is a hallmark of hypothyroidism). I'm thinking of asking to be medicated. Did you feel better on the synthroid?

[peemomma]

I was wondering how everyone is doing now.  My endo just last week upped my synthroid from 112 mcg to 125 mcg because I was having bad symptoms ie dizziness nervousness pulps and headaches. Can anyone tell me how long it takes for the changes to be felt? Unfortunately I am feeling worse :(

[gimel]

Please post your thyroid related test results and reference ranges shown on the lab report so that members can assess the adequacy of your testing and treatment.  

[jmohr613]

I too was recently diagnosed with hypothyroidism and really do not understand the implications yet.  The results that I have is a TSH of 7.78.