Oxomemazine, Sans Sucre, Édulcorée À L’acésulfame Potassique Unither Pharmaceuticals (Oxomemazine)

Oxomemazine is a first‑generation H1‑receptor antagonist that acts on allergic and histamine‑mediated pathways.

• Allergic rhinitis: reduces nasal congestion, sneezing and itching.
• Acute urticaria: alleviates hives and skin itching.
• Pruritus associated with eczema: lessens itch intensity and improves sleep quality.

• Oxomemazine blocks H1 histamine receptors in peripheral tissues and the central nervous system, preventing histamine‑induced vasodilation, increased vascular permeability, and sensory nerve stimulation. This antagonism reduces the classic signs of an allergic response such as edema, erythema, and pruritus.

Adverse reactions to oxomemazine are generally dose‑dependent and may vary with individual sensitivity.

Common Side Effects

• Drowsiness: mild to moderate sedation, especially after the first doses.
• Dry mouth: reduced salivary flow causing a sticky sensation.
• Dizziness: transient light‑headedness, often resolved with continued use.
• Gastrointestinal discomfort: mild nausea or abdominal cramps.
• Blurred vision: temporary focusing difficulty.

Serious or Rare Side Effects

• Cardiac arrhythmias: irregular heart rhythm requiring medical evaluation.
• Severe allergic reaction: rash, swelling, or airway compromise.
• Extrapyramidal symptoms: involuntary muscle movements or tremor.
• Hepatotoxicity: abnormal liver enzymes indicating liver stress.
• Hematologic abnormalities: low white blood cell or platelet counts.

When prescribing oxomemazine, clinicians should consider several safety aspects.

• Pregnancy: avoid use unless the benefit outweighs potential risk to the fetus.
• Breastfeeding: contraindicated as the drug passes into milk and may cause sedation in the infant.
• Elderly patients: start with the lowest effective dose and monitor for excessive sedation.
• Concomitant CNS depressants: may enhance drowsiness and impair coordination.
• Driving or operating machinery: advise patients to refrain until they know how the drug affects them.
• Store at below 25°C: keep in the original packaging, protect from moisture and direct sunlight.

Oxomemazine may interact with other medicines that influence the central nervous system or cardiac conduction.

Major Interactions (Avoid)

• Other antihistamines: additive sedation and anticholinergic load.
• Monoamine oxidase inhibitors (MAOIs): risk of hypertensive crisis.
• QT‑prolonging agents: increased potential for arrhythmias.

Moderate Interactions (Monitor Closely)

• Alcohol: enhances drowsiness and psychomotor impairment.
• Opioid analgesics: may potentiate respiratory depression.
• Sedative‑hypnotics: increased risk of profound sedation.
• Anticholinergic drugs: heightened dry‑mouth and constipation effects.