Consider the allergy medicine sneeze-b-gone. the regular adult dose is 20 milligrams. as with all medicines, the body gradually filters sneeze-b-gone out of the bloodstream. the rate at which the medicine is filtered out is called the flush rate. for sneeze-b-gone, the flush rate is 30%. in other words, 24 hours after the pill is taken, 30% of sneeze-b-gone has flushed out of the body.