Allergic reaction to generic Proair is rare, but can be recognized through signs of rash, severe dizziness, increased trouble with breathing, or swelling of the face, tongue and throat. More common side effects not associated with an allergic reaction include, shaking, cough, headache, nausea, and trouble sleeping. Inform a physician immediately if you are experiencing muscle cramps or increased heartbeat. When taking over the counter diet aids, cough or cold medications, talk to a local doctor before you buy Proair. Some of these medications can have ingredients that increase heart rate.