Coma. The amount of time that levothyroxine (synthroid) takes to be eliminated from the body is relatively long in comparison to other medications, occurring over many days. It is unlikely that a patient would go into coma from low thyroid hormone levels within 7 days of stopping the medication. Still, before stopping thyroid medication, you should discuss with the child's treating physician.
No. The 1/2 life of thyroxine is 6 1/2 days - so the child may be less active and have other nonspecific complaints. Myxedema coma occurs after months of severe hypothyroidism.