I'm not really sure what you're asking here. I think you may be a little confused.
Ephedrine, itself, is a bronchodilator. A bronchodilator is just a medication that assists with airflow to the lungs. Those with asthma are sometimes prescribed a bronchodilator to help if they play sports or participate in exercise.
If you're in the US, you should be able to go to your local pharmacy and purchase ephedrine. I buy it at CVS under the brand name Bronkaid. I'm sure Walgreens has either Bronkaid or something similar.
Don't use Primatine or any other inhaler if your goal is to receive the Ephedrine from it. Primatene Mist has 0.22mg Ephedrine in each inhalation. Bronkaid, a pill form of Ephedrine, has 25mg per tablet which is a standard dose.