Does atarax (hydroxyzine) help to last longer in sex?

Not so much: If you're looking for a medication to slow your machinery down, don't self-medicate with something that can be a troublesome as "atarax" / hydroxyzine. Your physician might offer a very low dose of a selective serotonin reuptake inhibitor. Especially, work with your partner on "edging" and on the "squeeze technique" -- you'll reprogram yourself and bring each other to new heights. Best wishes.