A member asks if the therapy her husband is currently undergoing is the cause of his strange behavior. Namely irritability, abusiveness, and nocturnal tremors.
Thyroid replacement therapy with levothyroxine (Synthroid) or Armour thyroid should not cause these symptoms. Remember if you are hypothyroid and exhibit an underactive thyroid, replacing it with medication should make you euthyroid (normal thyroid levels).
I would want to check your husband’s TSH (thyroid stimulating hormone) level with a quick and simple blood test to ensure he is on the proper dose because over replacement can look like what you are describing! Make sure you follow up with serial TSH tests to ensure you are on the proper dose of thyroid replacement.