Has anyone had luck losing weight when put on medication for thyroid?

I lost weight after my the birth of my son when I was on thyroid medicine, and quit losing soon after discontinuing use. I have about 30 lbs to lose, and now I have been back on thyroid medicine for a few weeks and have lost about 2 lbs. I exercise regularly and try not to eat excessively, (about 1600-1900 calories a day, and I’m moderately active). Has anyone had luck losing weight after being diagnosed with a thyroid condition and starting on medication?
joe: No, I’ve kept the weight off, but I still needed to lose more, and even working out 2 hours a day and eating 1400 calories a day wouldn’t make a significant dent in the scales.
Here lately, I’ve been working out a little less than usual, eating a little more, and still losing weight. Weird!