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Several people are brought to a metropolitan emergency department after a chemical was deliberately released in a shopping centre. A six-year-old girl weighing 20 kg is drowsy with 1 mm pupils, profuse salivation, wet axillae and loud expiratory wheeze; her heart rate is 50 per minute and her systolic blood pressure is 75 mmHg. Staff are wearing gloves, gowns and eye protection. She is given atropine 1 mg intravenously. Five minutes later her chest is still wet and wheezy and her heart rate is 52 per minute. Which one of the following doses of atropine should be given next?
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