MRCP2-3801

You are requested to evaluate a 29-year-old woman who has been admitted to the ward after taking an overdose of Paracetamol. She is causing a disturbance on the ward and her partner informs you that she has a gambling addiction and has spent a significant amount on credit cards for unnecessary items. When you approach her, she is highly agitated and threatens to open an Emergency exit from the third floor ward, claiming that she can fly. She has declined observations from the nursing staff and has removed her N-acetylcysteine IV.
What is the most suitable pharmacological intervention in this case?