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Levothyroxine has a really long half life, 6-7 days. That means half of it is still in your body 7 days after you take it. Takes about a month for it all to be gone. This means if you forget a dose, nothing will happen to you, you can just take two the next day. I took a double dose one day by accident, nothing happened at all, I just skipped the next day. Noncompliant patients can take all seven days worth at once with no ill effects. So even though you need this med, it is very forgiving, you can easily make up missed doses with no symptoms.