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Overdosage symptoms are those of excessive β-stimulation, e.g. seizures, angina, hypertension or hypotension, tachycardia with rates up to 200 beats/min, arrhythmias, nervousness, headache, tremor, dry mouth, palpitation, nausea, dizziness, fatigue and insomnia. Hypokalaemia may occur following overdose with salbutamol. Serum potassium levels should be monitored.
Treatment consists of discontinuation of salbutamol together with appropriate symptomatic therapy. Administer a cardioselective β-adrenergic blocker (e.g. acebutalol, atenolol, metoprolol), if necessary for cardiac arrhythmias. However, β-adrenergic blocker should be used with caution because it could induce severe bronchospasm.
