Hydroxyzine is a sedating antihistamine that can be used short-term to treat anxiety and trouble sleeping, but is not meant for long-term use. Medicines typically used first-line for the treatment of anxiety are the antidepressants like the SSRIs or SNRIs (for example: paroxetine, sertraline, escitalopram). Hydroxyzine can provide relief from generalized anxiety disorder (GAD) and insomnia until your other treatment starts to work. In many people, sleep will improve once the anxiety lessens ... Hydroxyzine is an antihistamine used to treat itching, hives, and anxiety. It also acts as a sedative and is used with anesthesia for relaxation. Detailed Hydroxyzine dosage information for adults and children. Includes dosages for Anxiety, Nausea/Vomiting, Sedation and more; plus renal, liver and dialysis adjustments. Información relativa al paciente del fármaco Hydroxyzine revisada por un médico - incluye descripción, efectos secundarios (o reacciones adversas), posología e instrucciones de uso.