My watch list  


Systematic (IUPAC) name
CAS number 835-31-4
ATC code R01AA08
PubChem 4436
Chemical data
Formula C14H14N2 
Mol. mass 210.274
Pharmacokinetic data
Bioavailability  ?
Metabolism  ?
Half life  ?
Excretion  ?
Therapeutic considerations
Pregnancy cat.


Legal status
Routes Topical

Naphazoline (in the hydrochloride form) is the common name for 2-(1-naphthylmethyl)-2-imidazoline hydrochloride. It is a sympathomimetic agent with marked alpha adrenergic activity. It is a vasoconstrictor with a rapid action in reducing swelling when applied to mucous membrane. It acts on alpha-receptors in the arterioles of the conjunctiva to produce constriction, resulting in decreased congestion. It is an active ingredient in Naphcon-A and Clearine eye drops.

It has the molecular formula C14H14N2.HCl and a molecular weight of 246.73 g/mol.

Warnings and contraindications

A few warnings and contraindications that apply to all naphazoline-containing substances intended for medicinal use are:

  • Hypersensitivity to naphazoline
  • Patients taking MAO inhibitors can experience a severe hypertensive crisis if given a sympathomimetic drug such as naphazoline HCl
  • Use in infants and children can result in central nervous system depression, leading to coma and marked reduction in body temperature
  • Should be used with caution in patients with severe cardiovascular disease including cardiac arrythmia and in patients with diabetes, especially those with a tendency toward diabetic ketoacidosis
  • Drug interactions can occur with anaesthetics that sensitize the myocardium to sympathomimetics (e.g cyclopropane or halothane cautiously
  • Exercise caution when applying prior to use of phenylephrine.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Naphazoline". A list of authors is available in Wikipedia.
Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE