Stop using this medication and get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have a serious side effect such as:
bronchospasm (wheezing, chest tightness, trouble breathing), especially after starting a new canister of this medicine;
chest pain and fast, pounding, or uneven heart beats;
tremor, nervousness;
low potassium (confusion, uneven heart rate, extreme thirst, increased urination, ...
