A wife brought her 47 year-old husband to the emergency room after finding him unresponsive at their house. He has been suffering from depression for the last four years and has been taking Mirtazapine for it. He reports that he has ingested ‘maybe 10 pills’ around 30 minutes ago. Vital signs are remarkable for mild hypertension. In the physical examination you noticed a confused, sedated individual with sinus tachycardia. What is the next best step in his management?