If there is 50mg
of morphine in the body, 25mg (50%) will be lost
in 3 hours; if there is only 2mg
of morphine in the body, only 1mg (50%) will be lost in 3 hours. Note that in both cases, morphine levels drop by 50% during an interval of one half-life. (3 hours)
Because I am not a pharmacist, when the Singulair bottle says the half-life is 2.7-5.5 hours, I don't have the knowledge to figure out why there is such a discrepency in the half-life. But the way I see it is that between every 2.