Hydroxyzine
Generic: hydroxyzine hydrochloride / hydroxyzine pamoate · Brand: Vistaril® / Atarax® · Class: Anxiolytic / Antihistamine
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How It Works
Hydroxyzine is a first-generation antihistamine with significant anxiolytic and sedative properties. It works by blocking histamine H1 receptors and also has activity at serotonin and muscarinic receptors, contributing to its calming effect. Unlike benzodiazepines, it has no abuse potential, no dependence risk, and is not a controlled substance. It works quickly — within 30–60 minutes — making it useful for acute anxiety and situational anxiety. The sedating effect is consistent and does not diminish with repeated use the way benzodiazepines do.
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What It Treats
Acute and Situational AnxietyRapid onset for acute anxiety relief — works in 30–60 minutes
Generalized AnxietyCan be used scheduled or as-needed for ongoing anxiety management
InsomniaSedating effect useful for anxiety-related sleep difficulties
Anxiety in PregnancyOne of the safer anxiolytic options during pregnancy
Anxiety in RecoveryNo abuse potential — safe for patients in recovery from substance use disorders
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Dosing Overview
| Population | Start | Typical Range | Max |
|---|---|---|---|
| Adults Anxiety (as needed) | 25–50 mg | 25–100 mg per dose | 400 mg/day |
| Adults Anxiety (scheduled) | 25–50 mg 3–4x daily | 75–200 mg/day | 400 mg/day |
| Adults Insomnia | 50 mg at bedtime | 50–100 mg | 100 mg at bedtime |
| Children Anxiety | 0.6 mg/kg per dose | 0.6 mg/kg per dose | 50 mg/day |
Vistaril (pamoate) and Atarax (HCl) are equivalent. Can be taken with or without food. Onset in 30–60 minutes; duration 4–6 hours. Sedation decreases with repeated use for some patients.
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Side Effects
Common
- Sedation and drowsiness
- Dry mouth
- Dizziness
- Blurred vision
- Constipation
- Urinary retention
- Headache
- Confusion (in older adults)
Call us if you notice
- Significant QT prolongation (cardiac effects)
- Severe urinary retention
- Confusion or altered mental status (especially elderly)
- Allergic reaction
- Seizures (rare, very high doses)
Hydroxyzine is one of the safest anxiolytics available — no dependence, no abuse potential, and widely used in pregnancy. Dry mouth and sedation are the most common complaints. Use with caution in older adults due to anticholinergic effects.
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Tips for Success
Works in 30–60 MinTake 30–60 minutes before anxiety-provoking situations for best effect.
Caution DrivingSedation is significant — do not drive until you know how it affects you.
No AlcoholAlcohol dramatically worsens sedation.
Caution in ElderlyAnticholinergic effects (confusion, urinary retention) are more common in older adults.
Dry MouthSugar-free gum or lozenges help with dry mouth.
Tell All ProvidersAntihistamine effects can interact with other anticholinergic medications.
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Important Safety Information
QT Prolongation: Hydroxyzine can prolong the QT interval. Tell your provider about any heart conditions or other QT-prolonging medications.
Older Adults: Hydroxyzine has significant anticholinergic effects — confusion, urinary retention, constipation, and falls are more common in elderly patients. Use with caution.
Pregnancy: Hydroxyzine is one of the safer anxiolytics in pregnancy but should still be used with caution. Discuss with your provider.
Questions? I am here. Reach me between appointments if you have concerns about side effects, notice mood changes, or have questions about your medication.
360-389-3712info@rootedmindspsychiatry.com