Few things about thyroid replacement
1. Dose in children per pounds is usually higher than in adults as kid are growing and hormone requirement is more than adults
2. The dose you need is entirely dependent on your thyroid function tests
and not based on your symptoms
3. You can take more thyroxine
for your weight loss
and it can results in rhythm problems in heart, osteoporosis
, muscle pain
So check your thyroid function tests in a good lab an then decide on treatment.
Hope I have answered your question. If you have any further questions I will be happy to help.
Dr Ajish TP