My wife is on Synthroid. From what I understand, the price of that type of medicine is not too bad, even without insurance, if you are willing to go generic.
The key here is to tell your doctor what you are doing. He might be happy to write a separate perscription for three months for you for use in emergencies. If he is willing, he might even write up a double-dose, and you can get a pill splitter.
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Darwin was wrong -- I'm still alive