What is the effective dosage of Ephedrine in Mg.? I stacking Bayer 325 Mg., 200 Mg. Caffeine and Bronkaid(has 25 Mg. of Ephedrine) dosing at 6:00 AM and a second around 10:45-11:00 AM. I'm thinking about a 3rd dose around 3:45 PM or so, depends on how I feel the next few days.