How long does it take for Synthroid to take full effect?

I just started taking Synthroid about 2 weeks ago and I am wondering how long it will take for it to kick in and take effect. How long will it take for me to have a regular menstral cycle and begin ovulating?

User Comments

  1. I get the levels check every 6 weeks until the correct dosage is found. Then 6 months after that and then every year (unless I am pregnant).
  2. I am also taking Synthroid after being diagnosed with a Thyroid condition and having part of it removed. It took about two weeks for me to start feeling good again. I had been suffering from lack of energy, irritability, mood swings, lack of concentration and memory loss. I was also cold when others were warm and warm when others were cold as well as gaining weight easily. I am feeling so much better now however, I have to stay active in order to maintain this feeling.
  3. Honestly, it can take a while to get your thyroid med dosages optimized; sometimes it can be up to 3 mons. before you and your doc find the right dosage. Do you get your levels checked monthly? I would give it at least another couple weeks and if nothing happens/you don't feel better, have your endocrinologist draw blood and check your levels...you may need a higher or lower dosage.