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A 16-year-old girl with a history of ADHD is brought to ED by her parents. She is agitated, restless and complains of palpitation. HR 140 bpm, BP 180/100 mm Hg, pupils 7 mm. She is hyper-reflexic and looks very anxious. ECG shows sinus tachycardia.
When questioned, she says she has been taking more lisdexamphetamine to help her to perform well in her examinations.
Question: Which of the following is the most appropriate medication to treat this patient?