Minims (Oxybuprocaine Hydrochloride)

Oxybuprocaine Hydrochloride is used as a topical ophthalmic anesthetic for procedures involving the ocular surface.

• Diagnostic eye examinations: provides rapid corneal anesthesia to facilitate slit‑lamp biomicroscopy and tonometry.
• Minor ocular surgeries: enables painless performance of procedures such as foreign‑body removal or laser applications.
• Contact lens fitting: reduces discomfort during lens placement and removal for patients with sensitivity.
• Intravitreal injections: offers temporary surface anesthesia to improve patient comfort.

• Oxybuprocaine Hydrochloride acts by reversibly blocking voltage‑gated sodium channels in peripheral nerve membranes of the ocular surface. This inhibition prevents the initiation and propagation of nerve impulses, resulting in a rapid loss of sensation in the cornea and conjunctiva without affecting deeper ocular structures.

Oxybuprocaine Hydrochloride may cause ocular irritation or allergic reactions, although most patients tolerate it well.

Common Side Effects

• Burning or stinging sensation upon instillation.
• Transient redness of the conjunctiva.
• Increased tearing or watery discharge.
• Temporary blurred vision.
• Mild eyelid edema.
• Mild allergic conjunctivitis.

Serious or Rare Side Effects

• Corneal epithelial defect or ulceration.
• Severe allergic reaction with swelling and itching.
• Anaphylaxis (rare systemic reaction).
• Persistent keratitis.
• Elevated intra‑ocular pressure.
• Vision loss (extremely rare).

Before using Minims, consider the following safety measures.

• Allergy assessment: verify no known hypersensitivity to oxybuprocaine or related anesthetics.
• Contact lens use: remove lenses before instillation and wait recommended interval before reinsertion.
• Repeated application: limit frequency to avoid corneal toxicity.
• Pediatric use: exercise caution and follow specialist guidance.
• Pre‑existing ocular disease: assess risk in patients with keratitis, ulceration, or severe dry eye.
• Store at room temperature: keep in the original container, protect from light and moisture.

Oxybuprocaine Hydrochloride may interact with other ophthalmic agents; monitor patients accordingly.

Major Interactions (Avoid)

• Concurrent use of multiple ophthalmic anesthetics: increased risk of corneal toxicity.
• Combination with topical vasoconstrictors: may exacerbate ocular irritation.

Moderate Interactions (Monitor Closely)

• Use with topical antibiotics: monitor for delayed wound healing.
• Co‑administration with anti‑inflammatory eye drops: possible alteration of drug absorption.
• Interaction with preservative‑containing solutions: may increase ocular surface irritation.
• Use with systemic sodium channel blockers: no direct effect but monitor overall patient status.