- Suxamethonium, IV, 1–1.5 mg/kg.
- Onset 30–60 seconds.
- Duration 5 minutes.
- Repeated doses associated with bradycardia and prolonged neuromuscular block.
- Contraindicated in patients at risk for developing suxamethonium-induced hyperkalaemia, e.g. upper or lower motor neuron defect, prolonged chemical denervation (ICU >3 days), direct muscle trauma, tumour or inflammation, burns, disuse atrophy, severe infection, pre-existing hyperkalaemia.