Like any medication, the inhaler can have negative side effects. The most common side effect is irritation of the lining of the mouth. Less frequent side effects include coughing, runny nose or upset stomach. These symptoms are generally mild and likely to decrease with use. A sore throat is also a common withdrawal symptom. Gargling with warm saltwater several times per day can help.
For more information see: http://www.nlm.nih.gov/medlineplus/druginfo/meds/a606021.html