Hydroxyzine fda approval 1956?

Yes. Hydroxyzine (specifically hydroxyzine hydrochloride, the active ingredient in Atarax) was approved by the FDA in 1956. The related salt hydroxyzine pamoate (brand name Vistaril) was approved later.

If you want the exact approval date for a specific formulation, you can check:
- Drugs@FDA (FDA’s drug approval database)
- The FDA Orange Book (Approved Drug Products with Therapeutic Equivalence Evaluations)

I can guide you to the exact page steps if you’d like.