Side effects of Foradil can include: Abdominal pain, Agitation, Anaphylaxis, Angina pectoris, Anxiety, Atrial fibrillation, Behavioral changes, Bronchitis, Cardiac arrhythmia, Chest pain, Cough, Decreased glucose tolerance, Dermatitis, Diarrhea, Disturbed sleep, Dizziness, Dysgeusia, Dyspepsia, Dyspnea, Exacerbation of asthma, Fatigue, Fever, Gastroenteritis, Headache, Hyperglycemia, Hypertension, Hypokalemia, Insomnia, Malaise, Metabolic acidosis, Muscle cramps, Muscle spasm, Nausea, Nervousness, Palpitations, Paradoxical bronchospasm, Pharyngitis, Prolonged QT interval on ECG, Pruritus, Respiratory tract infection, Restlessness, Sinusitis, Skin rash, Tachycardia, Tonsillitis, Tremor, Urticaria, Variable blood pressure, Ventricular premature contractions, Voice disorder, Vomiting, Xerostomia