Hydroxyzine Medical Valley (Hydroxyzine Hydrochloride)

Hydroxyzine is an H1‑antihistamine that acts on allergic and anxiety‑related pathways.

• Allergic skin conditions: reduces histamine‑mediated itching and rash.
• Pruritus: alleviates intense itching associated with dermatologic disorders.
• Anxiety: provides short‑term relief of tension and nervousness.

• Hydroxyzine hydrochloride selectively blocks histamine H1 receptors, preventing histamine‑induced vasodilation and sensory nerve activation. Its additional anticholinergic activity contributes to sedation, while central nervous system effects produce anxiolysis. The combined antagonism dampens allergic responses and produces calming effects without affecting other neurotransmitter systems.

Hydroxyzine may cause a range of adverse reactions.

Common Side Effects

• Drowsiness: feeling unusually sleepy or fatigued.
• Dry mouth: reduced salivation leading to a parched sensation.
• Blurred vision: temporary difficulty focusing.
• Constipation: slowed gastrointestinal motility.
• Headache: mild to moderate cranial pain.
• Dizziness: sensation of light‑headedness or unsteadiness.

Serious or Rare Side Effects

• Anaphylaxis: severe allergic reaction with breathing difficulty.
• Cardiac arrhythmia: irregular heart rhythm, including QT prolongation.
• Seizures: rare occurrence of convulsive episodes.
• Hepatic dysfunction: abnormal liver enzyme elevations.
• Blood dyscrasias: rare blood cell abnormalities.
• Prolonged QT interval: risk of serious ventricular arrhythmias.

When prescribing Hydroxyzine, consider the following safety measures.

• Assess sedation risk: evaluate patient’s need for tasks requiring alertness.
• Avoid operating machinery: advise patients not to drive or use heavy equipment while sedated.
• Monitor elderly patients: increased susceptibility to anticholinergic effects.
• Use caution in glaucoma: anticholinergic activity may raise intra‑ocular pressure.
• Do not discontinue abruptly: taper if long‑term use to avoid rebound symptoms.
• Store at ambient temperature below 25°C: keep in the original pack, protect from moisture and light.

Hydroxyzine can interact with several drug classes.

Major Interactions (Avoid)

• Central nervous system depressants: may enhance sedation and respiratory depression.
• Alcohol: increases drowsiness and impairments.
• Monoamine oxidase inhibitors: risk of severe hypotension.
• Other antihistamines: additive anticholinergic and sedative effects.
• QT‑prolonging drugs: heightened risk of cardiac arrhythmias.

Moderate Interactions (Monitor Closely)

• CYP3A4 inhibitors (e.g., ketoconazole): may raise hydroxyzine plasma levels.
• CYP3A4 inducers (e.g., rifampin): may reduce therapeutic effect.
• Anticholinergic agents: cumulative dry‑mouth and constipation.
• Sedative antidepressants: enhanced central sedation.
• Opioids: increased risk of respiratory depression and profound sedation.