Immune System Disorders: Very Rare: Hypersensitivity reactions including angioedema, urticaria, bronchospasm, hypotension and collapse.
Metabolism and Nutrition Disorders: Rare: Hypokalemia. Potentially serious hypokalemia may result from Beta2 agonist therapy. Very rare: Lactic acidosis.
Lactic acidosis has been reported very rarely in patients receiving intravenous and nebulised salbutamol therapy for the treatment of acute asthma exacerbation.
Nervous System Disorders: Common: Tremor, headache. Very rare: Hyperactivity.
Cardiac Disorder: Common: Tachycardia. Very Rare: Cardiac arrhythmias including atrial fibrillation, supraventricular tachycardia and extrasystoles.
Vascular Disorder: Rare: Peripheral vasodilation.
Respiratory, Thoracic and Mediastinal Disorders: Very Rare: Paradoxical bronchospasm.
Gastrointestinal Disorder: Uncommon: Mouth and throat irritation.
Musculoskeletal and Connective Tissue Disorders: Uncommon: Muscle cramps.