What is this pill - with '900N' or 'N006 imprint? (It's white and round)?

N006 is Hydroxyzine HCl 25mg
Labeler /Mfg NORTHSTAR RX

More info at https://www.drugs.com/hydroxyzine.html

Hydroxyzine is used as a sedative to treat anxiety and tension. It is also used together with other medications given for anesthesia. Hydroxyzine may also be used to control nausea and vomiting.

Hydroxyzine is also used to treat allergic skin reactions such as hives or contact dermatitis.