Clinical data
Trade names Naphcon-a
AHFS/ Monograph
Routes of
Topical (solution)
ATC code R01AA08 (WHO) S01GA01 (WHO)
CAS Number 835-31-4 N
PubChem (CID) 4436
DrugBank DB06711 YesY
ChemSpider 4283 YesY
KEGG D08253 YesY
ECHA InfoCard 100.011.492
Chemical and physical data
Formula C14H14N2
Molar mass 210.274
3D model (Jmol) Interactive image
 NYesY (what is this?)  (verify)

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 several over-the-counter formulations including Clear Eyes and Naphcon eye drops.[1]

The non-hydrochloride form of Naphazoline has the molecular formula C14H14N2 and a molar mass of 210.28 g/mol. The HCl salt form has a molar mass 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:

A possible association with stroke has been suggested.[2]


  1. Green, S. M. (2008). "Ophthalmology: Naphazoline". Tarascon Pocket Pharmacopoeia 2009. Jones and Bartlett. ISBN 0-7637-6572-4.
  2. Zavala, J. A.; Pereira, E. R.; Zétola, V. H.; Teive, H. A.; Nóvak, E. M.; Werneck, L. C. (2004). "Hemorrhagic stroke after naphazoline exposition: case report". Arquivos de Neuro-Psiquiatria. 62 (3B): 889–891. doi:10.1590/S0004-282X2004000500030. PMID 15476091.
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