My husband was just diagnosed with hypothyroidism. And his dr. Gave him 2 sample boxes of 50mg. Syntheoid how manu should he take a day?

Call the doc. If he was just diagnosed with hypothyroidism, he most likely will be on 50 mcg/day so one pill/day. However, without knowing more details, the best thing to do is to call the prescribing doc to find out for sure.