This is Dr. David
your synthroid is 75 mcg or micrograms, not milligrams.
75 mcg is 0.075 mg
your dogs pills are .8 mg milligrams
you should let your doctor know you took your dog's thyroid hormone pills.
most likely your doctor will tell you not to take your thyroid hormone pills for about 10 days and then resume them like normal.
you will be completely fine.
thyroid hormone is a slow acting hormone and changes to your thyroid hormone levels don't act quickly.
let me know if you have other questions.
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