
There are four main groups of asthma medications:
Relievers
Relieve asthma attacks by rapidly opening narrowed airways.
Symptom controllers
Control asthma symptoms by helping to keep narrowed airways open for an extended period of time - usually 12 hours.
Preventers
Prevent asthma attacks by treating the inflammation in the airways.
Combination medication
Combine a preventer and symptom controller in one device.