1. Clinical Overview
A sterile, preservative-free, topical ophthalmic solution combining a high molecular weight ocular lubricant (carboxymethylcellulose) with a hyperosmotic agent (glycerin). It is designed to provide immediate and prolonged relief from dry eye symptoms by lubricating the ocular surface, stabilizing the tear film, and osmotically drawing fluid to reduce corneal epithelial edema and hyperosmolarity. It is a first-line therapy for mild to moderate dry eye disease (DED) in the Indian population, where environmental factors like pollution and low humidity exacerbate symptoms.
| Onset | Duration | Bioavailability |
|---|---|---|
| Immediate (within 1-2 minutes of instillation) | Approximately 60-90 minutes per instillation | Topical ophthalmic; negligible systemic absorption. |
2. Mechanism of Action
The combination works synergistically. Carboxymethylcellulose (CMC) is a water-soluble polymer that adheres to the mucin layer of the tear film, increasing its viscosity and residence time on the ocular surface. It lubricates, protects, and hydrates the corneal and conjunctival epithelium. Glycerin, a hyperosmotic agent, creates an osmotic gradient that draws water from the corneal stroma and conjunctiva into the tear film, thereby reducing tear film hyperosmolarity (a key inflammatory trigger in DED) and mitigating corneal epithelial edema. This dual action restores tear film stability and homeostasis.
3. Indications & Uses
- Dry Eye Disease (DED) / Keratoconjunctivitis Sicca (KCS) - Mild to Moderate
- Tear Film Insufficiency
- Symptomatic Relief of Dryness, Burning, Irritation, and Grittiness
4. Dosage & Administration
Adult Dosage: Instill 1-2 drops into the affected eye(s) as needed, typically 3 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. Hold dropper tip down, squeeze bottle to instill 1-2 drops into the pouch without touching the eye or any surface. 5. Close eyes gently for 1-2 minutes, applying light pressure to the inner corner of the eye (nasolacrimal occlusion) to minimize systemic drainage. 6. Wait at least 5-10 minutes before instilling any other ophthalmic medication. 7. Discard single-use vial immediately after use. For multi-dose bottles, replace cap tightly and do not touch tip.
5. Side Effects
Common side effects may include:
- Transient mild blurring of vision (lasts 1-5 minutes)
- Mild ocular discomfort or stinging upon instillation
- Sticky eyelashes upon drying
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Other Topical Ophthalmic Medications (e.g., Glaucoma drops, Antibiotics, Steroids) | Physical incompatibility or dilution. May reduce contact time and efficacy of the other drug if instilled simultaneously. | Moderate |
7. Patient Counselling
- DO wash hands before use.
- DO use as frequently as needed to relieve symptoms.
- DO wait 5-10 minutes between different eye drops.
- DO store unopened vials/bottles as directed.
- DON'T touch the dropper tip to your eye, fingers, or any surface.
- DON'T share your eye drops with others.
- DON'T use if the solution is discolored or contains particles.
- DON'T wear contact lenses while using unless the product is specifically labeled as 'for use with contacts'.
8. Toxicology & Storage
Overdose: Accidental ingestion of bottle contents: GI upset, diarrhea (due to glycerin's osmotic laxative effect). Ocular overdose: Excessive blurring, stickiness, possible foreign body sensation from polymer residue.
Storage: Store at room temperature (15°C - 25°C). Protect from light. Do not freeze. Keep out of reach of children. For single-use vials: Use immediately after opening and discard any unused solution. Do not store opened vials. For multi-dose bottles: Use within 28 days of opening. Do not use if the tamper-proof seal is broken.