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Xylometazoline

*Xylometazoline*

For medical students2 min readUpdated 2026-10-10

Xylometazoline is an imidazoline derivative drug classified as a topical $\alpha_2$-adrenergic agonist. The drug exhibits a pronounced vasoconstrictive effect and is used in ENT practice to facilitate nasal breathing.

Chem. groupImidazoline derivative
ReceptorsPeripheral $\alpha_2$-adrenergic receptors
Formulation0.1% solution, 10 mL
Duration6–10 hours (depending on formulation)
RestrictionMaximum 5 days to avoid tachyphylaxis

Mechanism of Action

As an imidazoline derivative, xylometazoline selectively stimulates peripheral $\alpha_2$-adrenergic receptors located in the blood vessels of the nasal mucosa. Unlike the $\alpha_1$-agonist phenylephrine, topical administration of drugs in this subclass provides a more prolonged vasoconstrictive effect.

Pharmacological Effects

Activation of these receptors leads to constriction of the nasal mucosal vessels, reducing edema and decreasing blood flow to the venous sinuses. This provides the primary therapeutic outcome: improved sinus drainage and significant relief of nasal breathing.

Indications

The drug is administered intranasally for symptomatic treatment of rhinitis of various etiologies accompanied by severe nasal congestion. Topical formulations are used.

Side Effects and Risks

Failure to follow dosing regimens leads to characteristic complications:

Administration Guidelines and Contraindications

The standard dosage is 1–3 drops in each nostril 1–3 times a day. The medication should not be used more than 3 times daily. Due to the risk of systemic blood pressure elevation, the drug is contraindicated in patients with hypertension and severe atherosclerosis.

Mnemonic

Xylometazoline and oxymetazoline form a "dangerous duo" for rebound: do not instill for more than 5 days, or you will get withdrawal syndrome!

Frequently asked questions

What side effects are characteristic of xylometazoline?

Xylometazoline is associated with local and systemic side effects that occur primarily with prolonged use.

  • Tachyphylaxis — weakening of the vasoconstrictive effect when using the drug for more than 5 days.
  • Rebound phenomenon — secondary nasal congestion ("rebound" vasodilation) after discontinuation.
  • Rhinitis — development of medicamentosa (rebound syndrome) or atrophic rhinitis with use exceeding 5–7 days.
  • Systemic effects — elevation of blood pressure due to partial absorption into the bloodstream.
What are the absolute contraindications to xylometazoline?

Contraindications for xylometazoline include:

  • Hypertension.
  • Severe atherosclerosis.
  • Pregnancy.
What formulations and concentrations of xylometazoline are available?

Xylometazoline is available in topical intranasal formulations:

  • Drops — 0.1% solution, 2–3 drops.
  • Spray — 1 actuation from the metered pump.

For excessive rhinorrhea, a fixed combination of ipratropium bromide + xylometazoline is recommended.

What chemical group does xylometazoline belong to?

Xylometazoline is an imidazoline derivative (unlike phenylephrine, which has a different chemical structure).

Why should xylometazoline not be used for longer than 5 days?

Continuous use for more than 5 days leads to tachyphylaxis — rapid tolerance and weakening of the vasoconstrictive effect.

What is the rebound phenomenon in the context of xylometazoline use?

It is the development of secondary (rebound) nasal congestion after stopping the medication, which is most pronounced specifically with xylometazoline and oxymetazoline.

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