I could never figure out why 25mgs of Bronkaid (ephedrine Sulfate) makes me tired, an opposite effect of what its suppose to do but when i take 25mgs of Primatene i get crazy energy. I've read online of people who say the same thing as I and then others who say the opposite (they prefer bronkaid). I know the whole conversion ratio or sulfate and HCL but it honestly shouldn't make that big of a difference. probably just a classic example of how everyone's reaction can vary so greatly.