Half-life?: I wonder if your doctor was referring to Vistaril (hydroxyzine)'s "half-life"? That's the time it takes the body to reduce it to half it's "potency," and 3-4 hours is about right for Vistaril (hydroxyzine). The advantage of Vistaril (hydroxyzine) is that it acts within about 30 min, is not a high risk for dependency, and is especially good in helping people get to sleep. If staying asleep becomes an issue, other medicines may help.
Answered 3/16/2018
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