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Hydroxyzine blocks H1 histamine receptors and has anticholinergic, antiemetic, and anxiolytic properties through CNS depression. Unlike newer antihistamines, it crosses the blood-brain barrier producing sedation and anxiolysis.
Commercial hydroxyzine (Atarax, Vistaril) contains dyes and fillers problematic for MCAS and chemically sensitive patients. Compounding provides dye-free, gluten-free capsules, custom low doses for sensitive patients, and liquid suspensions for pediatric use.
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Hydroxyzine is a first-generation antihistamine that crosses the blood-brain barrier, producing sedation and anxiolytic effects. It is widely prescribed for generalized anxiety disorder, insomnia, pruritus, chronic urticaria, and as a preoperative anxiolytic.
For MCAS patients, hydroxyzine is a valuable addition to H1/H2 antihistamine protocols. Commercial formulations often contain dyes and excipients that trigger reactions in chemically sensitive individuals. Compounded dye-free, preservative-free capsules and liquids solve this critical problem.
H1 Receptor Antagonism
Hydroxyzine competitively blocks H1 histamine receptors on smooth muscle, vascular endothelium, and sensory nerve endings, reducing vasodilation, edema, bronchospasm, and itch signaling associated with histamine release.
CNS Depression / Anxiolysis
Hydroxyzine crosses the blood-brain barrier and suppresses activity in subcortical CNS regions, producing sedation, anxiolysis, and antiemetic effects independent of its H1 blockade. This CNS activity makes it effective for anxiety and preoperative sedation.
Anticholinergic Effects
Like other first-generation antihistamines, hydroxyzine has muscarinic receptor blocking activity, contributing to dry mouth, urinary retention, and GI motility reduction.
Generalized anxiety disorder (GAD), insomnia, pruritus, chronic urticaria, MCAS protocol (H1 antihistamine component), allergic reactions, preoperative sedation, atopic dermatitis, nausea
Preoperative and procedural anxiolysis, postoperative nausea and vomiting, alcohol withdrawal adjunct, opioid-sparing analgesia (reduces opioid requirements), acute agitation management
Anxiety/Insomnia: 25–100mg at bedtime or 3–4x daily as prescribed
Pruritus/Urticaria: 25mg 3–4x daily
MCAS low-dose start: 10–25mg titrated to response
Pediatric: 0.6mg/kg/dose — requires compounded liquid formulation
MCAS/Allergy: Start at 10–25mg at bedtime to gauge sedation; increase to daytime dosing once tolerance to sedation develops (typically 1–2 weeks).
Anxiety: Start 25mg 1–2x daily; titrate to 50–100mg as tolerated.
Pediatric: Start at 0.3mg/kg/dose; increase per response — compounded liquid makes precise titration practical.
Dye-free Capsules — custom strengths (10mg, 25mg, 50mg) compounded without FD&C dyes, lactose, gluten, or preservatives, essential for MCAS and chemically sensitive patients
Oral Liquid Suspension — typically 10mg/5mL or 25mg/5mL for pediatric dosing and precise adult titration
Standard Capsules (custom strength) — intermediate doses (e.g., 12.5mg, 37.5mg) not available commercially
Sedation, dry mouth, urinary retention, QT prolongation (at high doses). Avoid in elderly patients (Beers Criteria). Do not combine with CNS depressants, opioids, or alcohol. Use caution in patients with cardiac arrhythmia history.
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