Hydroxyzine Hydrochloride Bluefish Pharmaceuticals (Hydroxyzine Hydrochloride)

• Hydroxyzine hydrochloride is a first‑generation H1‑antagonist used to manage several allergic and anxiety‑related conditions.
• Allergic skin conditions (pruritus, urticaria): reduces itching and hives.
• Anxiety and tension: provides symptomatic relief of nervousness.
• Sedation before medical procedures: induces calming effect for minor surgeries or diagnostic tests.
• Nausea and vomiting: helps control symptoms associated with motion sickness or postoperative nausea.

• Hydroxyzine hydrochloride acts as a selective antagonist of peripheral histamine H1 receptors, blocking the actions of endogenous histamine that cause vasodilation, increased vascular permeability, and sensory nerve stimulation. It also exhibits anticholinergic activity by inhibiting muscarinic receptors and penetrates the central nervous system, producing sedative and anxiolytic effects through central H1 blockade and modulation of neurotransmitter release.

Hydroxyzine hydrochloride may cause a range of adverse reactions, from mild to serious.

Common Side Effects

• Drowsiness or sedation
• Dry mouth
• Blurred vision
• Constipation
• Headache
• Dizziness

Serious or Rare Side Effects

• Cardiac arrhythmia
• Severe hypotension
• Anaphylactic reactions
• Seizures
• Hepatic injury (rare)
• Extrapyramidal symptoms

• Hydroxyzine hydrochloride requires careful use in several clinical situations.
• Pregnancy: safety not established; avoid unless benefit outweighs risk.
• Breathing disorders: may exacerbate respiratory depression.
• Elderly: increased sensitivity to sedative and anticholinergic effects.
• Concomitant CNS depressants: may enhance sedation and impair cognition.
• Operating machinery: avoid driving or using heavy equipment until response is known.
• Store at room temperature: keep in original container, protect from moisture and light.

Hydroxyzine hydrochloride can interact with other medicines, altering its safety or effectiveness.

Major Interactions (Avoid)

• Alcohol: additive central nervous system depression.
• Opioids: increased risk of profound sedation and respiratory depression.
• Other antihistamines: cumulative anticholinergic burden.
• Benzodiazepines or barbiturates: heightened sedative effects.

Moderate Interactions (Monitor Closely)

• Anticholinergic drugs (e.g., atropine): may worsen dry mouth and constipation.
• CYP3A4 inhibitors (e.g., ketoconazole): can raise hydroxyzine plasma levels.
• CYP3A4 inducers (e.g., rifampin): may reduce therapeutic effect.
• Theophylline: potential increase in theophylline concentrations.