http://www.medications.com/effect/view/40973 Following my 1st dosages of Eltroxin, my blood tests came back as my still having a very low thyroid. I've been taking it again for 5 weeks and am experiencing very uncomfortable and unusual tremors which last for a few seconds. I am not epileptic so, obv Wed, 10 Jun 2009 13:47:13 -0400 http://www.medications.com/effect/view/40973?item=20500 Eltroxin, like all forms of levothyroxine, takes 4 to 6 weeks to build up in your system. Have you had another blood test since you have been on it again? Tremors are a reported side-affect of eltroxin. If you have not already done so, I would suggest s http://www.medications.com/effect/view/40973?item=20500