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In the case of Levothyroxine, you do not want fluctations of drug.

They are not good after the expiration date, especially levothyroxine. A drug is considered exired when 10% of the active drug has broken down.

In most cases, it doesn't hurt someone but it doesn't help.

i know that most meds are still good after expiration dates, but i'm not sure how long after expiration. I doubt that the tablets are still fully potent a year after the exp date.

I suspect that's the major contributor to your problems.