Couple of things: If it is not relieving your symptoms or if you are having trouble breathing you need to see your doctor.
Answered 10/29/2012
5.5k views
By how you feel: If you still feel short of breath/coughing/wheezy/tired, your asthma medicine may not be working. It may be that the canister is empty (don't hear anything on shaking; floats in water); old/expired, or you may need stronger medicine.
Answered 10/29/2012
5.5k views
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