1/2 gr is approx 50mcg of levothyroxine and you should increase by 1/4 tablet (1 gr) around every two weeks until you feel much better and symptoms are relieved. You should take pulse/temp too, before beginning if possible, and if either should go too high you drop back to previous dose. Also if you write down the clinical symptoms you have and tick them off as you improve.
Your blood tests on NDT should indicate a TSH lower than 1, a low in range or below range T4 and a T3 at the top of its range but not over. However we are all different and our need for hormones varies from person to person. So gradually increase as Shaws has said keeping an eye on pulse and temp. Hope you feel better soon.
Content on HealthUnlocked does not replace the relationship between you and doctors or other healthcare professionals nor the advice you receive from them.
Never delay seeking advice or dialling emergency services because of something that you have read on HealthUnlocked.