Maresyl Ha (Xylometazoline Hydrochloride)

Xylometazoline Hydrochloride is used as a topical nasal decongestant to alleviate swelling of the nasal mucosa in various upper‑respiratory conditions.

• Common cold: provides rapid reduction of nasal blockage, improves breathing, and helps relieve associated pressure symptoms during viral upper respiratory infection.
• Acute sinusitis: eases mucosal swelling, promotes sinus drainage, and reduces facial pressure caused by sinus inflammation.
• Allergic rhinitis: diminishes nasal mucosal edema and congestion triggered by allergen exposure, supporting clearer nasal passages.

• Xylometazoline Hydrochloride acts as a selective alpha‑adrenergic agonist on the α1‑ and α2‑receptors of the nasal mucosal blood vessels. Activation induces vasoconstriction, which reduces blood flow and edema in the nasal lining, thereby decreasing swelling and opening the airway. The drug’s high affinity for these receptors produces a pronounced local response within minutes, while its limited systemic distribution minimizes cardiovascular impact in most users.

Xylometazoline Hydrochloride may cause local and systemic adverse reactions, most of which are mild and transient.

Common Side Effects

• Nasal burning or stinging sensation
• Dryness of the nasal mucosa
• Sneezing
• Headache
• Unpleasant taste
• Transient epistaxis (nosebleed)

Serious or Rare Side Effects

• Severe hypertension
• Cardiac arrhythmias
• Allergic reactions such as rash, itching, or swelling
• Nasal septum perforation with prolonged use
• Rebound congestion (rhinitis medicamentosa) after extended therapy

When using Maresyl Ha, several precautions should be observed to ensure safe and effective treatment.

• Duration of use: limit treatment to 3–5 days to prevent rebound congestion.
• Pregnancy and lactation: safety has not been established; consult a healthcare professional before use.
• Pediatric use: not recommended for children under 6 years of age unless directed by a physician.
• Concomitant decongestants: avoid using multiple nasal decongestants simultaneously to reduce risk of excessive vasoconstriction.
• Underlying cardiovascular disease: use with caution in patients with hypertension or heart disease.
• Store at below 25°C: keep the product in its original container, protect from moisture and direct sunlight.

Xylometazoline Hydrochloride can interact with other medications, affecting cardiovascular tone or nasal mucosa health.

Major Interactions (Avoid)

• Monoamine oxidase inhibitors (MAOIs): combined use may cause hypertensive crisis due to additive vasoconstriction.
• Systemic sympathomimetics (e.g., pseudoephedrine): may lead to excessive blood pressure elevation.
• Other nasal decongestants: concurrent use increases risk of severe vasoconstriction and rebound congestion.

Moderate Interactions (Monitor Closely)

• Beta‑blockers: may mask tachycardia symptoms induced by nasal vasoconstriction.
• Antihypertensive agents: nasal decongestant may reduce their effectiveness, requiring blood pressure monitoring.
• Topical nasal irritants (e.g., cocaine, steroid nasal sprays): may exacerbate local irritation.