The drug works by stimulating adrenergic receptors on the lamina propria of blood vessels in the nose. The decongestant effect is due to constriction of large veins in the nose which swell up during the inflammation of any infection or allergy of the nose. The smaller arteries are also constricted and this causes the colour of the nasal epithelium to be visibly paler after dosage.<unk>  is an imidazole derivative which is designed to mimic the molecular shape of adrenaline. It binds to α1 and α2 adrenergic receptors in the nasal mucosa. Due to its sympathomimetic effects, it should not be used by people with high blood pressure, or other heart problems. Extended usage of<unk>  can result in decreased effectiveness or a buildup of tolerance against the drug. The number of receptors decreases, and when the administration of the drug is ceased, chronic congestion can occur; this is called rhinitis medicamentosa, commonly referred to as rebound congestion. Moreover, long-term overdosing can cause degenerative changes in nasal mucous membranes that pose another health problem.
Xylometazoline
Methylergometrine
Indometacin
Indometacin farnesil
Oxymetazoline
Ergometrine
Alclometasone
Beclometasone