As long as it takes: The question posed is discombobulated but if you are asking how long u need to be on propranolol to counteract the effects of too much thyroid medication (levothyroxine), the answer is "as long as it takes for your body to get rid of the excess". Excess hormone causes a fast heart rate, which is blunted by propranolol. You need carefull monitoring. Don't stop suddenly, as the HR will rebound; tape
Answered 6/30/2016
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