Re: How do you tell if it's really asthma?
Call your doctor and make an appointment. It might be time for a course of prednisone.
Ventolin SHOULD last more than 2 hours, but it doesn't always. When I am flaring, I use my inhaler every 5 hours. That's when it wears off, I could set my watch by it. And when I'm doing something that places extreme demands on the lungs, like winter sports, it only lasts about 2 hours.