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Specifications
| Appearance: | White crystallized powder |
| Assay: | 98% - 102% |
| Identification: | (A) IR confirms (B) The retention time of the major peak of the sample solution corresponds to that of the standard solution, as obtained in the assay (C) Identification of Chloride |
| Organic Impurities: | Naphazoline related compound A: 0.1% max 1-Naphthylacetic acid: 0.10% max Any individual unspecified impurity: 0.1% max Total impurities: 0.5% max |
| Loss on Drying: | 0.5% max |
| Residue on Ignition: | 0.2% max |
| Residual Solvent (Ethanol): | 0.5% max |
| pH: | 5.0–6.6 |
Applications
Naphazoline hydrochloride (CAS 550-99-2) is a sympathomimetic agent widely used in ophthalmology and otolaryngology. It acts as a selective α-adrenergic receptor agonist, producing vasoconstriction in the eyes and nasal mucosa. It is commonly formulated in eye drops to relieve redness, irritation, and minor allergic conjunctivitis, and in nasal sprays or drops to reduce congestion caused by colds, allergies, or sinusitis. Additionally, it is used in combination with other active ingredients in multi-symptom cold and allergy medications to enhance efficacy.
Benefits
The benefits of Naphazoline hydrochloride derive from its rapid onset of action, effective vasoconstriction, and localized activity. By constricting blood vessels in the eyes or nasal passages, it quickly reduces redness, swelling, and irritation without significant systemic effects when used at recommended doses. Its chemical stability allows for long shelf life in aqueous formulations, and it can be safely combined with other agents to provide multi-symptom relief. The compound's effectiveness and ease of formulation make it a reliable and widely used therapeutic agent in ophthalmic and nasal care.
Conclusion
Naphazoline hydrochloride is a potent α-adrenergic agonist with key applications in relieving eye redness and nasal congestion. Its rapid and localized vasoconstrictive action, stability in formulations, and compatibility with other therapeutics make it a valuable ingredient in ophthalmic and nasal care products. By providing fast and effective symptom relief, it remains an essential compound in both clinical and over-the-counter treatments.
