Xylometazoline hydrochloride: Effect on nasal congestion

Xylometazoline hydrochloride is the salt form of the imidazoline derivative xylometazoline and the most frequently used decongestant nasal spray in Germany (brand names Olynth, Otriven, Nasic, Nasivin in one variant, and numerous generics). In pharmacies, xylometazoline hydrochloride is available as a 0.1 percent solution for adults and a 0.05 percent solution for children between two and six years of age. Some preparations combine xylometazoline hydrochloride with dexpanthenol, hyaluronic acid, or seawater to care for the mucous membrane.

The active ingredient and salt form are pharmacologically nearly identical. The hydrochloride is the water-soluble form suitable for topical applications to the eye or nose. In clinical practice, xylometazoline and xylometazoline hydrochloride are often not linguistically distinguished. The properties described here apply largely equally to both designations, with focus on the salt form commonly used in sprays.

Mechanism of action

Xylometazoline hydrochloride is a sympathomimetic with pronounced affinity for the alpha 1 adrenergic receptor and to a lesser extent for the alpha 2 receptor. Locally on the nasal mucosa, activation of alpha 1 receptors leads to vasoconstriction of the venous sinusoids and mucosal blood vessels. Mucosal swelling decreases, nasal airflow improves, and secretion is temporarily reduced. The effect occurs within minutes and lasts 8 to 10 hours with standard preparations.

Use should be limited to a maximum of seven days, as with longer therapy tolerance and a paradoxical rebound effect can occur. When the mucous membrane swells more after the effect ends than before, pharmacists and ENT doctors speak of a rebound phenomenon called privinism. This pattern is a common cause of chronic nasal spray dependence, especially in self-medication with prolonged colds or allergies.

Systemic absorption is low but can play a relevant role in infants, very frequent use, or larger applied amounts. In young children, hypothermia, drowsiness, and bradycardia have been reported, which is why dosing is age-appropriate and use is avoided under two years of age if no age-appropriate concentration is available.

Areas of application

• Acute nasal congestion (acute rhinitis) from colds, short-term relief of nasal congestion
• Allergic rhinitis, short-term during acute phases, supplementary to glucocorticoid nasal sprays
• Swelling in sinusitis, especially to improve ventilation of the paranasal sinuses
• Eustachian tube dysfunction, short-term before flights or diving, controversial study results
• Preparation for ENT examinations, decongestant before nasal endoscopy

Xylometazoline hydrochloride is not suitable for chronically atrophic or dryness-altered mucous membrane. For chronic sinusitis or allergic rhinitis, long-acting therapies such as nasal glucocorticoids or antihistamines are more appropriate.

Dosage and administration

Adults and children from 6 years: 0.1 percent spray, one spray per nostril one to three times daily. Maximum duration of use seven days.

Children between 2 and 6 years: 0.05 percent spray, one spray per nostril maximum three times daily.

Children under 2 years: very restrictive use in Germany, often drops with lower concentration under medical prescription.

Application technique: Keep head slightly upright, spray bottle upright, single spray per nostril, inhale briefly, do not tilt head back. Do not share spray bottle with other people because transmission of pathogens is possible.

Renal and hepatic insufficiency: with systemically low absorption usually no adjustment required. Exercise caution with impaired elimination capacity and very frequent use.

Rebound prevention: After a maximum of seven days of use, take a break, alternatively use alternating application pattern with saline rinses, inhalation, and if necessary topical glucocorticoids.

Side effects

Frequent: local burning or stinging, dryness of nasal mucosa, sneezing, crust formation.

Occasional: Rebound congestion with prolonged use, headache, nausea, sleep disturbances.

Rare: Systemic effects such as tachycardia, blood pressure increase, restlessness, tremor, especially with frequent or excessive use. In infants and young children, rare but relevant central effects such as drowsiness, bradycardia, and hypothermia can occur.

Privinism: chronic nasal spray dependence with rebound congestion and mucous membrane atrophy. Treatment through weaning one nostril at a time, saline rinses, glucocorticoid nasal sprays, and ENT medical supervision.

In narrow angle glaucoma: Caution, as systemic absorption could theoretically contribute to an acute glaucoma attack.

Interactions

• MAO inhibitors (tranylcypromine, moclobemide, selegiline): potential hypertensive crisis with systemic absorption, avoid combination.
• Tricyclic antidepressants: potentiation of sympathomimetic effects.
• Other sympathomimetics (pseudoephedrine, phenylephrine systemically): additive effect with increased blood pressure and tachycardia.
• Beta blockers: paradoxically increased blood pressure elevations possible due to unopposed alpha effects.
• Volatile anesthetics (halothane, isoflurane): myocardial sensitization, arrhythmia risk with systemic absorption.
• Glucocorticoid nasal sprays: useful combination for allergic rhinitis, no direct conflict.

Special notes

Pregnancy: Short-term use in low doses is possible, especially in the second and third trimester. Caution because systemic absorption can affect uterine blood flow. Breastfeeding: short-term acceptable, with frequent use observe the nursing infant.

Infants and young children: use age-appropriate concentration and dropper bottle. An accidentally high dose can lead to severe sedation and bradycardia, then seek medical help immediately.

Elderly patients: Exercise caution in patients with cardiovascular disease, low doses, short therapy duration.

Pre-existing conditions: Caution with manifest hypertension, severe coronary artery disease, hyperthyroidism, pheochromocytoma, narrow angle glaucoma, benign prostatic hyperplasia with residual urine, severe atrophy of nasal mucosa.

Lifestyle for chronic nasal congestion: Saline rinses, inhalation with water vapor, adequate fluid intake, air humidification, allergological evaluation if chronic allergy suspected. Topical glucocorticoids are more effective and safer for symptoms lasting longer than two weeks.

When to see a doctor: for symptoms lasting more than seven days, unilateral persistent congestion, bloody discharge, smell disturbances, pressure headache, high fever, or suspected privinism, ENT medical evaluation is advisable.

Ability to drive: usually not impaired with normal use, rarely dizziness or sleep disturbances.

You might also be interested in

• Xylometazoline, the pharmacological base text for the substance
• Cetirizine, H1 antihistamine for allergic rhinitis
• Loratadine, another modern antihistamine
• Budesonide, inhaled glucocorticoid for asthma and rhinitis
• Cineole, herbal secretolytic for respiratory diseases

Frequently asked questions

Sources

• Gelbe Liste, Xylometazoline active ingredient profile
• BfArM, Federal Institute for Drugs and Medical Devices
• AWMF, Guidelines for acute nasal congestion and rhinitis
• German Society for Otorhinolaryngology