Medically reviewed by Daniel More, MD Key Takeaways Asthma inhalers can be for quick relief or long-term control.Rescue inhalers work by relaxing your airway muscles to help you breathe better.People ...

It was the respiratory therapist (RT) in charge of smoking cessation who first showed me a peak inspiratory flow meter with known resistance (PIFr). Dry-powder inhalers require inspiratory force for ...