1. Clinical Overview
A sterile, preservative-free, topical ophthalmic solution combining two demulcent and lubricating agents. It is primarily used as an artificial tear substitute to relieve symptoms of dry eye disease (DED) by mimicking the properties of natural tears, providing lubrication, hydration, and protection to the ocular surface. The formulation is isotonic and has a pH compatible with the eye.
| Onset | Duration | Bioavailability |
|---|---|---|
| Immediate relief upon instillation, typically within 1-2 minutes. | Variable, typically 1-2 hours per instillation, depending on the severity of dry eye. | Topical ophthalmic; negligible systemic absorption. |
2. Mechanism of Action
The combination acts synergistically to lubricate, protect, and hydrate the ocular surface. Polyethylene Glycol (PEG) 400 is a high-molecular-weight polymer that forms a hydrophilic film over the cornea, prolonging tear film breakup time (TBUT) and providing sustained lubrication. Propylene Glycol is a humectant and demulcent that binds water, helps stabilize the tear film lipid layer, and promotes epithelial healing.
3. Indications & Uses
- Symptomatic relief in Dry Eye Disease (DED) / Keratoconjunctivitis Sicca
- Management of ocular irritation and discomfort due to insufficient tear production
- Lubrication and protection of the ocular surface
4. Dosage & Administration
Adult Dosage: One or two drops in the affected eye(s) as needed, typically 4 to 6 times daily or as directed by a physician. Can be used more frequently in severe cases.
Administration: 1. Wash hands before use. 2. Tilt head back. 3. Gently pull down lower eyelid to form a pouch. 4. Instill the drop(s) into the pouch without touching the dropper tip to the eye, eyelid, or any surface. 5. Close eyes gently for 1-2 minutes. Apply gentle pressure to the inner corner of the eye (nasolacrimal occlusion) to minimize systemic drainage. 6. For single-dose vials: use immediately after opening. Discard the vial after use, even if solution remains. Do not store for later use.
5. Side Effects
Common side effects may include:
- Transient mild blurring of vision immediately after instillation
- Mild, temporary ocular discomfort or stinging upon application
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Other topical ophthalmic medications | May dilute other eye drops if instilled simultaneously, reducing their efficacy. | Moderate |
| Eye drops containing preservatives (e.g., Benzalkonium Chloride) | This preservative-free formulation is often recommended to avoid the toxic effects of preservatives. Using preserved drops concurrently may negate this benefit. | Mild |
7. Patient Counselling
- DO wash your hands before use.
- DO use the drops as frequently as needed to relieve discomfort.
- DO wait at least 5-10 minutes between instilling this lubricant and any other prescribed eye medication.
- DO discard the single-dose vial immediately after use.
- DON'T touch the dropper tip to your eye, fingers, or any surface to avoid contamination.
- DON'T use if the solution is discolored or contains particles.
- DON'T wear contact lenses while instilling the drops unless specifically advised by your doctor. Remove lenses before use and wait at least 15 minutes before reinserting.
8. Toxicology & Storage
Overdose: Accidental oral ingestion of contents from a single vial is unlikely to cause significant toxicity due to the small volume (typically 0.4-0.8 ml) and low concentration. Symptoms would be related to the osmotic laxative effect of PEG (diarrhea, abdominal cramping). Ocular overdose from frequent instillation may lead to excessive tearing, blurred vision, and discomfort.
Storage: Store in a cool, dry place, protected from light. Do not freeze. Keep single-dose vials in the foil pouch until ready to use. For multi-dose bottles (if available), keep the cap tightly closed when not in use. Do not use after the expiry date printed on the packaging.