PowerLung is a product designed be used for exercise only and is not intended to diagnose, treat, cure, or prevent any disease. It is a fitness training machine designed to allow isolated training of the muscles used in breathing for both inhale and exhale. The muscles it is designed to train are: the diaphragm, the intercostals, and the accessory muscles.
There have been studies done on asthmatics using a similar protocol but for inhale only. In those studies, the treatment group experienced a reduction in the number and severity of their attacks. While PowerLung itself has not been specifically tested on asthmatics, many of our customers have advised us of similar results in their lives after using the PowerLung.
You should always consult your personal physician for more information about your condition.