Here is a detailed overview of Phenylephrine Eye Drops 10%:
💧 Phenylephrine Hydrochloride Ophthalmic Solution 10%
✅ DESCRIPTION
Phenylephrine 10% Eye Drops is a strong alpha-adrenergic agonist used in ophthalmology for pupil dilation (mydriasis), diagnostic testing, and as an adjunct in ocular surgeries. It causes contraction of the dilator muscle of the iris and vasoconstriction in the conjunctival blood vessels.
🧪 FORMULATION
- Active Ingredient: Phenylephrine Hydrochloride 10% (100 mg/mL)
- Preservative: Benzalkonium chloride 0.01% (may vary)
- Excipients:
- Sodium chloride
- Sodium citrate
- Citric acid
- Sodium metabisulfite (antioxidant)
- Purified water
- Form: Clear, sterile ophthalmic solution
🌿 NATURE
- Type: Sympathomimetic agent
- Class: Alpha-1 adrenergic receptor agonist
- Mechanism of Action:
Stimulates alpha-1 receptors → contracts iris dilator muscle → causes mydriasis (pupil dilation)
Also induces vasoconstriction → reduces redness & conjunctival congestion
💊 USES
- Diagnostic Purposes:
- Pupil dilation for fundus examination
- Testing for Horner’s syndrome
- Surgical Use:
- Pre-operative pupil dilation (e.g., cataract surgery)
- To maintain mydriasis during intraocular procedures
- Therapeutic Use:
- Anterior uveitis – prevents or breaks posterior synechiae
- Reducing ocular congestion
🌟 ADVANTAGES
- Produces intense and rapid pupil dilation
- Longer duration of action (up to 5–7 hours)
- Useful in patients with dark irises (less responsive to lower concentrations)
- Enhances intraoperative visibility
⚠️ PRECAUTIONS
Local Side Effects:
- Temporary stinging or burning
- Photophobia
- Conjunctival blanching
- Blurred vision
Systemic Side Effects (More likely with 10% solution):
- Hypertension, tachycardia, reflex bradycardia
- Palpitations, arrhythmias
- Headache, nervousness
- Rare: Pulmonary edema, cardiac events (especially in infants or elderly)
Contraindications:
- Severe cardiovascular disease
- Thyrotoxicosis
- Hypertension
- Narrow-angle glaucoma
- Infants under 1 year (use with extreme caution)
Use With Caution In:
- Elderly patients
- Patients on monoamine oxidase inhibitors (MAOIs)
- Apply punctal occlusion after instillation to reduce systemic absorption
🧊 STORAGE
- Store at 15°C to 25°C
- Protect from light and moisture
- Keep bottle tightly closed
- Do not freeze
- Discard 28 days after opening
- Keep out of reach of children
⚖️ Comparison: 5% vs 10% Phenylephrine Drops
| Feature | 5% Solution | 10% Solution |
|---|---|---|
| Mydriasis strength | Moderate | Strong & rapid |
| Use in children | Safer, preferred | Use with caution, avoid in infants |
| Systemic risk | Lower | Higher – monitor BP/HR |
| Dark irises | Less effective | More effective |