Maxitrol (Neomycin Sulfate, Polymyxin B Sulfate, Dexamethasone)

Maxitrol is used in ophthalmology to manage bacterial infections and inflammatory conditions of the eye.

• Bacterial conjunctivitis: reduces bacterial load and alleviates associated redness and discharge.
• Keratitis: treats bacterial corneal infection and controls inflammatory response to preserve vision.
• Blepharitis: eliminates bacterial overgrowth on eyelid margins and diminishes swelling and irritation.

• Neomycin sulfate binds to the bacterial 30S ribosomal subunit, inhibiting protein synthesis, while Polymyxin B sulfate interacts with the lipopolysaccharide layer of Gram‑negative bacterial membranes, disrupting permeability and causing cell death. Dexamethasone, a potent glucocorticoid, activates intracellular glucocorticoid receptors, modulating gene transcription to suppress the release of inflammatory mediators, thereby reducing edema, erythema and pain.

Topical ocular administration of Maxitrol may be associated with a range of local and systemic adverse reactions.

Common Side Effects

• Burning or stinging sensation: transient discomfort upon instillation.
• Blurred vision: temporary visual disturbance that resolves after the drop spreads.
• Itching or redness: mild irritation of the conjunctiva.
• Foreign body sensation: feeling of something in the eye.
• Increased tearing: watery eyes shortly after dosing.

Serious or Rare Side Effects

• Allergic reaction: swelling, rash, or severe eye irritation requiring medical attention.
• Secondary ocular infection: overgrowth of non‑susceptible organisms leading to worsening symptoms.
• Elevated intra‑ocular pressure: potential risk of glaucoma with prolonged use.
• Cataract formation: rare risk with extended corticosteroid exposure.
• Corneal ulceration: severe corneal damage necessitating immediate discontinuation.

Before prescribing Maxitrol, clinicians should consider several safety precautions to minimize risks.

• Hypersensitivity: avoid use in patients with known allergy to any component.
• Viral infections: do not use for viral conjunctivitis or keratitis.
• Glaucoma: use with caution in patients with elevated intra‑ocular pressure or glaucoma.
• Prolonged therapy: limit duration to reduce risk of corticosteroid‑related side effects.
• Contact lens wear: advise removal of lenses before and after instillation.
• Store at room temperature: keep in original container, protect from light and moisture.

Maxitrol may interact with other ophthalmic or systemic agents, affecting efficacy or safety.

Major Interactions (Avoid)

• Systemic corticosteroids: concurrent use can increase risk of systemic glucocorticoid effects.
• Other topical antibiotics: may lead to additive toxicity or resistance.
• Antiviral eye drops: reduced effectiveness when combined with the corticosteroid component.

Moderate Interactions (Monitor Closely)

• Anticholinergic eye drops: possible increase in intra‑ocular pressure.
• Non‑steroidal anti‑inflammatory eye drops: monitor for corneal healing complications.
• Contact lens solutions containing preservatives: may exacerbate ocular irritation.