Oxomemazine Sans Sucre, Édulcorée À L'acésulfame Potassique Eg (Oxomemazine)

Oxomemazine is a first‑generation H1‑receptor antagonist that reduces histamine‑mediated allergic responses.

• Allergic rhinitis: alleviates nasal congestion, sneezing and itching.
• Acute urticaria: reduces wheal formation and pruritus.
• Pruritic skin conditions: eases itching associated with insect bites or mild dermatitis.

• Oxomemazine blocks histamine H1 receptors in peripheral tissues and the central nervous system, preventing histamine from binding and activating the cascade that leads to vasodilation, increased vascular permeability, and sensory nerve stimulation. This antagonism reduces the typical signs of allergic reactions such as itching, swelling, and redness.

Oxomemazine may cause a range of adverse reactions, most of which are mild and reversible.

Common Side Effects

• Drowsiness: feeling unusually sleepy or fatigued.
• Dry mouth: reduced salivation leading to a sticky sensation.
• Dizziness: light‑headed feeling, especially when standing quickly.
• Gastrointestinal discomfort: mild nausea or stomach upset.
• Blurred vision: temporary difficulty focusing.

Serious or Rare Side Effects

• Cardiac arrhythmias: irregular heartbeat, particularly in patients with pre‑existing heart disease.
• Severe skin reactions: such as Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Hepatic dysfunction: elevated liver enzymes indicating liver stress.
• Hematologic abnormalities: rare cases of blood dyscrasias like agranulocytosis.

Before using Oxomemazine, consider the following safety measures:

• Pregnancy: avoid unless clearly needed, as safety data are limited.
• Breastfeeding: discontinue if infant shows signs of sedation or irritability.
• Elderly patients: start with the lowest effective dose due to increased sensitivity to sedation.
• Concomitant CNS depressants: monitor for enhanced drowsiness or respiratory depression.
• Driving and machinery: avoid operating vehicles or heavy equipment until individual response is known.
• Store at below 25°C: keep in the original container, protect from moisture and direct sunlight.

Oxomemazine can interact with several drug classes; awareness helps prevent adverse outcomes.

Major Interactions (Avoid)

• Monoamine oxidase inhibitors (MAOIs): risk of hypertensive crisis and exaggerated anticholinergic effects.
• Other sedating antihistamines or CNS depressants: may cause profound sedation or respiratory depression.

Moderate Interactions (Monitor Closely)

• Alcohol: can increase drowsiness and impair coordination.
• Anticholinergic agents: may intensify dry mouth, urinary retention, or constipation.
• CYP2D6 substrates: oxomemazine may alter plasma levels of drugs metabolised by this pathway.