[bellamommy]

I have had Hypothyroidism for the last 7 years. As everyone before has said the biggest challenge is getting the dose right. As you loose or gain weight your dose will need to change as well. I have also had the Dr check my T-4 and T-3 levels. Usually they tend to just check the T-4 levels. I found it important to check both, because when both are not working correctly together it seems the dose doesn't quite fix the problem.
I have been on Phen now for about 2 weeks and I have not run into any trouble with my thyroid meds and the Phen. Although I am sure they will need to lower my thyroid meds soon.
One of the challenges with your thyroid meds is you need to take it for a month before the Dr. can check your levels and change your dosage. It's a bit maddening, but eventually they get it all squared away.
Also, be sure to tell them of any side effects you have! There are different types of thyroid meds and they can affect you different ways.
Anyway... please let me know if you have any extra questions and concerns and I am more than happy to relate my experiences! As long as you have a good Dr and you tell them everything you are going through it will be just fine! =0)