How many hours after ativan can i take hydroxyzine?

That depends on various factors. They are both sedating. The combo can cause excessive drowsiness. Without knowing your medical history, experience with sedatives, other pharmaceutical uses, or indication for those drugs, then it is difficult to give you safe advice. Check with your prescribing doctor.

You should not mix Ativan with hydroxyzine because both can cause sedation with respiratory depression. You could fall asleep and have your breathing slow down significantly which can lead to low oxygen levels. Everyone metabolizes medicine differently so if you took one of these medicines today, I would not take the other one tonight since low oxygen levels during sleep can be life-threatening.