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Mydriacyl

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Short-acting eye drops used to enlarge the pupil before clinical examinations or ocular surgery.
Ingredient
Tropicamide
Category
Ophthalmic Care
Availability
In Stock
Delivery
Airmail (14-21 days) | EMS trackable (5-9 days)
Product is shipped in a fully discreet envelope with no content disclosure, including all required documentation inside

Product Sheet

Alternative/Local Brand
Mydriacyl
Active Ingredient(s)
Tropicamide
Primary Category
Eye Examination, Optometry
Therapeutic Class
Sensory Organs, Ophthalmologicals, Mydriatics and Cycloplegics
Pharmacological Class
Antimuscarinics
Indications
Dilating pupils for eye exams, Paralysis of the eye muscle for testing
Contraindications
Narrow-angle glaucoma, Hypersensitivity to tropicamide
Minor Side Effects
Stinging on application, Blurred vision, Sensitivity to light
Moderate Side Effects
Dry mouth, Headache, Increased eye pressure
Serious Side Effects
Acute glaucoma attack, Rapid heartbeat, Hallucinations (particularly in children)
Dosage Forms
Eye drops
Administration Route
Topical (Ophthalmic)
Mechanism of Action
Mydriacyl blocks the receptors in the muscles of the eye's iris. This action causes the pupil to widen (dilation) and temporarily prevents the eye from focusing, which allows an eye specialist to examine the back of the eye more easily.
Prescription Status
Rx
Manufacturer
Alcon
Patient Summary
Short-acting eye drops used to enlarge the pupil before clinical examinations or ocular surgery.
Onset Time
15-40 minutes
Duration
4-6 hours
Storage Instructions
Store below 25°C. Do not freeze.
Drug Interactions
Antihistamines, Antidepressants
Age Restrictions
Suitable for all ages, but use with caution in young children.
Pregnancy Use
Use only if clearly needed and prescribed by a doctor.
Alternative Drugs
Atropine, Cyclopentolate, Phenylephrine

What is Mydriacyl?

Mydriacyl is an ophthalmic solution used to dilate the pupil for eye examinations and certain procedures.

  • Therapeutic classification: Ophthalmic Care (mydriatic agent)
  • Active ingredient: Tropicamide, a selective antimuscarinic compound
  • Formulation: Clear liquid supplied in a bottle
  • Strength: 1 % (w/v) tropicamide solution
  • Regulatory status in Hong Kong: Prescription-only medication, regulated by the Hong Kong Department of Health

This article covers tropicamide, available as a generic medication and marketed under brand names such as Mydriacyl.

How Mydriacyl Works in the Body

Tropicamide blocks muscarinic (M4) receptors in the iris sphincter muscle.

  • Result: Relaxation of the sphincter muscle, producing pupil dilation (mydriasis) and temporary paralysis of the ciliary muscle (cycloplegia).
  • Onset: Typically 15-30 minutes after instillation.
  • Peak effect: 30-60 minutes.
  • Duration: The dilated state lasts 4-6 hours, after which normal pupil function returns as the drug is metabolized and cleared from the ocular surface.

By reducing the eye’s ability to constrict, tropicamide provides a clear view of the retina, optic nerve, and other internal structures.

Conditions Treated by Mydriacyl

Mydriacyl is approved for diagnostic and therapeutic procedures that require a dilated pupil.

  • Routine eye examinations (e.g., fundus photography, retinal screening)
  • Pre-surgical assessment for cataract or glaucoma surgery
  • Diagnostic testing such as fluorescein angiography or laser procedures

The medication is intended for adult patients who need a reliable, short-acting mydriatic effect.

Patient Suitability and Contraindications

Who should use Mydriacyl?

  • Adults requiring pupil dilation for clinical evaluation.

Absolute contraindications

  • Known hypersensitivity to tropicamide or any component of the formulation.
  • Presence of acute narrow-angle (angle-closure) glaucoma.

Relative contraindications

  • History of chronic open-angle glaucoma (use with caution and monitor intra-ocular pressure).
  • Severe cardiovascular disease, especially uncontrolled tachyarrhythmias.
  • Pregnancy or breastfeeding (consult a healthcare professional; safety data are limited).

Patients with these conditions should discuss alternative strategies with their eye care provider.

Safety Profile: Side Effects and Interactions

Common Side Effects

  • Transient stinging or burning sensation on the ocular surface.
  • Mild redness or increased lacrimation.
  • Temporary blurred vision due to loss of accommodation.

These effects usually resolve within a few hours as the drug wears off.

Serious Adverse Events

  • Acute angle-closure glaucoma (rare but vision-threatening; seek emergency care).
  • Persistent cycloplegia lasting longer than 6 hours.
  • Systemic anticholinergic effects such as dry mouth, tachycardia, or urinary retention (uncommon with ocular use).

Drug Interactions

  • Major: Concomitant use of other potent mydriatics (e.g., phenylephrine) may produce excessive dilation and raise intra-ocular pressure.
  • Moderate: Systemic anticholinergic agents (e.g., atropine) can potentiate ocular antimuscarinic effects.

Patients should inform their ophthalmologist of all ocular and systemic medications, including over-the-counter eye drops.

Food and Lifestyle Interactions

  • No specific food interactions have been identified.
  • Alcohol does not alter the mydriatic effect but may increase the risk of dizziness from systemic anticholinergic activity.
  • Driving or operating machinery should be avoided until vision clears after the drug’s effect subsides.

How to Take Mydriacyl

  • Standard dosing: Instill 1-2 drops of the 1 % solution into the conjunctival sac of the target eye(s) 15-30 minutes before the planned procedure.
  • Multiple eyes: If both eyes require dilation, repeat the same dose in each eye, observing a brief interval to avoid cross-contamination.
  • Special populations: No dosage adjustment is required for elderly patients, but clinicians may start with a single drop to assess tolerance.
  • Administration tips:
  • Wash hands before handling the bottle.
  • Tilt the head back, gently pull down the lower eyelid, and place the drop(s) without touching the bottle tip to the eye or lashes.
  • Close the eyes gently for 1-2 minutes to enhance absorption.
  • Missed dose: If a scheduled dose is missed before a procedure, repeat the dose at the next appropriate time; do not double the amount.
  • Overdose: Excessive ocular exposure may cause prolonged cycloplegia and systemic anticholinergic symptoms. Seek medical attention if severe irritation, vision loss, or systemic signs occur.
  • Discontinuation: No tapering is required; the effect wears off naturally.

Monitoring and Follow-Up

  • Intra-ocular pressure (IOP) check: Recommended for patients with glaucoma risk factors, especially if multiple mydriatic agents are used.
  • Visual assessment: Patients should be advised to report persistent blurred vision or pain beyond the expected duration.
  • Routine follow-up with the eye care professional is advised after any diagnostic procedure that required dilation.

Storage and Handling

  • Store the bottle at room temperature (15-30 °C).
  • Keep away from direct sunlight and moisture.
  • Ensure the cap is tightly closed to maintain sterility.
  • Discard any solution that appears contaminated, discolored, or past the expiration date printed on the label.
  • Keep out of reach of children and pets.

Medication-Specific Glossary

Mydriasis
Pharmacologic dilation of the pupil achieved by relaxing the iris sphincter muscle.
Cycloplegia
Temporary paralysis of the ciliary muscle that inhibits the eye’s ability to focus on near objects.
Antimuscarinic
A class of drugs that block muscarinic acetylcholine receptors, reducing parasympathetic activity in target tissues.
Intra-ocular pressure (IOP)
The fluid pressure inside the eye; elevated IOP is a risk factor for glaucoma.

Medical Disclaimer

This article provides educational information about Mydriacyl and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.

Mydriacyl FAQ

What is the typical onset time for pupil dilation after using Mydriacyl?

Pupil dilation usually begins within 15-30 minutes after instillation, reaching its peak effect around 30-60 minutes.

Can Mydriacyl be used in children for eye examinations?

Mydriacyl is primarily approved for adult use; pediatric application should be decided by an ophthalmologist based on safety considerations.

How does Mydriacyl differ from phenylephrine eye drops?

Mydriacyl (tropicamide) works by blocking muscarinic receptors, while phenylephrine stimulates alpha-adrenergic receptors; the former primarily induces cycloplegia, whereas the latter mainly causes dilation without affecting accommodation.

Is it safe to drive after receiving Mydriacyl drops?

Vision may remain blurred for several hours due to cycloplegia; patients should avoid driving or operating machinery until visual clarity returns.

What should I do if I experience severe eye pain after using Mydriacyl?

Severe pain could indicate acute angle-closure glaucoma; seek emergency medical care immediately.

Can systemic medications like antihistamines affect the action of Mydriacyl?

Systemic anticholinergic agents may enhance ocular antimuscarinic effects, potentially prolonging dilation; inform your doctor of all medications you are taking.

Is there a risk of allergic reaction to the bottle’s preservative?

Some patients may react to preservatives such as benzalkonium chloride; if you notice persistent itching, redness, or swelling, discontinue use and consult your eye care provider.

How long can an opened bottle of Mydriacyl be used safely?

Follow the expiration date on the label; typically, the solution remains stable for 30 days after opening if stored properly and the cap remains sealed.

Will Mydriacyl affect my contact lens wear schedule?

It is recommended to remove contact lenses before instillation and avoid re-inserting them until the medication effect has worn off and any ocular irritation has resolved.

Are there any special considerations for patients with diabetes?

Diabetic patients should be monitored for changes in blood glucose if systemic anticholinergic absorption occurs, although ocular use generally poses minimal systemic risk.

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