I take flecianide at 150 mg x 2 per day when stopping this drug how long would it take to be eliminated from my body

Half life is 20 hour: Depends on your renal function but typically should be eliminated in 3-5 days

Four to five days: Flecainide washout occurs at different rates in different people. In some people, it may take as long as four or five days before the drug is no longer detectable. It will stop working before that, though. Discontinuing the drug should also only be done at the direction of your doctor.