i have just been told by my eldest that his brother is taking liquid xanax and smoking weed. he is also on mirtazapine for depression which i am aware of. does anyone know if this combination is deadly. My son is also a self harmer. I am worried about what to do. i have just been in his room and found a small bottle of clear liquid with a pipette in the lid. as i have just found out i have not told his dad and my eldest is worried that if i confront his brother, he will not tell him anything else. Please could someone advise me.