Quick Facts
Generic NameHydroxyzine
Brand NameVistaril
Drug ClassAnxiolytic
FDA Approved1956
Starting Dose25mg as needed
Typical Range25–100mg 3–4x/day
Max Dose400mg/day
Half-Life20 hours
MetabolismCYP enzymes (hepatic)
Generic AvailableAlways generic
What Is Vistaril?
Hydroxyzine (brand name Vistaril) is a first-generation antihistamine anxiolytic (Anxiolytic) prescribed for anxiety disorders, insomnia, ptsd acute anxiety, and other psychiatric conditions. Rapid onset (15–30 min) — can be used as-needed. ZERO addiction potential. Very inexpensive. Available as hydroxyzine pamoate (Vistaril) and hydroxyzine HCl (Atarax). Good bridge therapy while waiting for SSRIs to work. Safe in elderly at reduced doses.
At Psychiatry Telemed, hydroxyzine is prescribed and monitored by board-certified psychiatrists who understand the nuances of Anxiolytic pharmacology — selecting the right dose, managing side effects, monitoring drug interactions, and optimizing your treatment through consistent monthly medication management appointments.
Hydroxyzine (Vistaril) — Anxiolytic medication for psychiatric care
ManufacturerPfizer
How Vistaril Affects Neurotransmitters
How Vistaril Works
Hydroxyzine antagonizes histamine H1 receptors centrally, producing anxiolytic and sedative effects. It also has anticholinergic and serotonin 5-HT2A antagonist properties that may contribute to its anxiolytic mechanism. Onset is rapid (15–30 minutes).
Efficacy: Vistaril vs. Comparators
Efficacy Comparison
Response & remission rates vs. comparators (Cipriani et al. meta-analysis)
Data from published meta-analyses. Individual response may vary.
Conditions Treated with Vistaril
Anxiety Disorders
FDA-approved for anxiety and tension. Rapid-onset, non-addictive.
Learn About Anxiety DisordersPTSD Acute Anxiety
Off-label for acute anxiety/hyperarousal episodes in PTSD.
Learn About PTSD Acute AnxietyConsidering Vistaril?
Board-certified psychiatrists can determine if hydroxyzine is right for you.
Dosage Information
| Indication | Starting Dose | Typical Range | Maximum |
|---|---|---|---|
| Anxiety Disorders | 25mg as needed | 25–100mg 3–4x/day | 400mg/day |
| Insomnia | 25mg as needed | 25–100mg 3–4x/day | 400mg/day |
| PTSD Acute Anxiety | 25mg as needed | 25–100mg 3–4x/day | 400mg/day |
Brain Regions Targeted by Vistaril
Side Effects
Like all medications, hydroxyzine has potential side effects. Most are mild, occur early in treatment, and resolve within 1–2 weeks. Your psychiatrist monitors at every appointment.
Common Side Effects
Drowsiness/SedationDry MouthDizzinessHeadacheConstipation
Less Common
Blurred VisionTremorUrinary RetentionGI UpsetFatigue
Serious (Seek Immediate Help)
QTc Prolongation (high doses)Seizures (very rare)Severe Allergic Reaction
Side Effect Profile: Vistaril vs. Class Average
Side Effect Profile
Incidence rates from FDA prescribing information vs. class average
Percentages from clinical trial data. Actual experience may differ.
⚠️ FDA Black Box Warning
No black box warning. QTc prolongation risk at very high doses.
Drug Interactions
Major Interactions
CNS depressants (additive sedation), anticholinergic drugs (additive effects), QTc-prolonging agents
CYP Metabolism
Metabolized hepatically. Active metabolite is cetirizine (Zyrtec). Relatively few significant drug interactions.
Alcohol
Avoid alcohol during hydroxyzine treatment. Both affect the CNS, increasing sedation and impairing judgment.
Generic Versions & Cost
Generic hydroxyzine available since Always generic. Approximate cost: $4–8/month. FDA-certified bioequivalent to brand-name Vistaril.
Starting Vistaril: What to Expect
First Weeks
Hydroxyzine is typically started at 25mg as needed and increased gradually. Common initial side effects usually improve within 1–2 weeks. Full therapeutic benefit develops over 4–8 weeks.
When to Contact Your Psychiatrist
Contact your psychiatrist for: worsening depression/anxiety, thoughts of self-harm, unusual agitation, severe side effects, or any concerning changes.
Stopping Vistaril Safely
Never stop hydroxyzine abruptly. Your psychiatrist will develop a gradual tapering schedule to minimize discontinuation effects.
Timeline: When Vistaril Starts Working
Timeline to Effectiveness
Expected improvement trajectory over the first 8 weeks
Based on clinical trial data. Full therapeutic effects may take 6–8 weeks.
Get Vistaril from a Board-Certified Psychiatrist
At Psychiatry Telemed, hydroxyzine is prescribed following comprehensive evaluation. All Florida via HIPAA-compliant telepsychiatry. 1–3 days. $200 eval, $100 follow-up.
Frequently Asked Questions
Prescribed for anxiety disorders, insomnia, ptsd acute anxiety.
Typically 2–4 weeks for initial improvement, 4–8 weeks for full benefit.
Common: drowsiness/sedation, dry mouth, dizziness, headache, constipation. Most resolve within 1–2 weeks.
No. Not habit-forming but should not be stopped abruptly — gradual tapering recommended.
Rapid onset (15–30 min) — can be used as-needed. ZERO addiction potential. Very inexpensive. Available as hydroxyzine pamoate (Vistaril) and hydroxyzine HCl (Atarax). Good bridge therapy while waiting
Alcohol should be avoided — increases sedation, impairs judgment, and may worsen symptoms.
Resources
Medical Disclaimer: Educational only. Consult a psychiatrist before starting/stopping medication. Crisis: call 988 or 911.
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