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Topical mast cell stabiliser Pregnancy: Preferably avoid in pregnancy. §4.6 verbatim — Pregnancy: 'There are no or limited amount of data from the use of ALOMIDE in pregnant-women. Animal studies do not indicate direct or indirect harmful effects with respect to reproductive toxicity. As a precautionary measure, it is preferable to avoid the use of ALOMIDE during pregnancy.' Lactation: 'It is not known whether lodoxamide is excreted in human milk. There is insufficient information on the excretion of lodoxamide from ALOMIDE in animal milk. A risk to the suckling child cannot be excluded. A decision must be made whether to discontinue breast-feeding or to discontinue/abstain from ALOMIDE therapy taking into account the benefit of breast feeding for the child and the benefit of therapy for the woman.'

Lodoxamide

Brand names: Alomide

Lodoxamide is a topical ophthalmic mast cell stabiliser used to treat allergic eye disorders, including vernal and seasonal allergic conjunctivitis and vernal keratoconjunctivitis.

Adult dose

Dose: Allergic conjunctivitis (topical mast cell stabiliser): one or two drops in each eye four times a day at regular intervals. §4.2 verbatim: 'Adults and children: One or two drops in each eye four times a day at regular intervals.'
Route: Topical (ophthalmic) — instilled into each eye. §4.4 warns, verbatim: 'ALOMIDE is not for injection.'
Frequency: Four times a day at regular intervals
Max: Two drops in each eye four times a day. §4.4 verbatim: 'The recommended frequency of administration should not be exceeded.' The SPC states no dose above this anywhere in §4.2.
The page is Lodoxamide, brand Alomide, topical ophthalmic mast cell stabiliser, ophthalmology — and the recovered source is the UK SPC for Alomide 0.1% w/v Eye Drops Solution, i.e. the page's own named brand and formulation. Indication (allergic conjunctivitis), route (topical ophthalmic) and population all match, so the §4.2 dose has been extracted. REGULARITY MATTERS (§4.2, verbatim): 'Patients should be advised that the effect of ALOMIDE therapy is dependent upon its administration at regular intervals, as directed.' TIME TO EFFECT (§4.2, verbatim): 'Improvements in signs and symptoms in response to ALOMIDE therapy (decreased discomfort, itching, foreign body sensation, photophobia, acute ocular pain, tearing, discharge, erythema/swelling, conjunctival redness, limbal reaction, epithelial disease, ptosis) are usually evident within a few days, but longer treatment for up to four weeks is sometimes required. Once symptomatic improvement has been established, therapy should be continued for as long as needed to sustain improvement.' INITIAL DISCOMFORT (§4.2, verbatim): 'Patients should also be advised that instillation of eye drops in allergic conjunctivitis may cause discomfort initially and that this will decline with improvement of the disease.' TECHNIQUE (§4.2, verbatim): 'Nasolacrimal occlusion or gently closing the eyelid after administration is recommended. This may reduce the systemic absorption of medicinal products administered via the ocular route and result in a decrease in systemic adverse reactions.' ELDERLY (§4.2, verbatim): 'There are no special precautions to be followed in prescribing ALOMIDE for the elderly.' CONCOMITANT STEROID (§4.2, verbatim): 'If required, corticosteroids may be used concomitantly with ALOMIDE.' CONTACT LENSES (§4.4): ALOMIDE contains 0.7 mg benzalkonium chloride in each 10 ml, equivalent to 0.07 mg/ml; 'Patients must be instructed to remove contact lenses prior to application of ALOMIDE and wait at least 15 minutes before reinsertion.' OTHER EYE DROPS (§4.5, verbatim): 'If more than one topical ophthalmic medicinal product is being used, the medicines must be administered at least 5 minutes apart. Eye ointments should be administered last.'

Paediatric dose

Route: Topical (ophthalmic)
Frequency: Four times a day at regular intervals
Max: Two drops in each eye four times a day — the same ceiling as adults; the SPC gives no separate paediatric dose
NOT WEIGHT-BASED — dosePerKg is deliberately null because this SPC expresses the dose as a fixed number of drops, not per kilogram. Do not derive a per-kg figure. §4.2 doses adults and children together, verbatim: 'Adults and children: One or two drops in each eye four times a day at regular intervals.' AGE FLOOR, verbatim: 'Children less than 4 years: The safety and effectiveness of ALOMIDE in children below the age of four years have not been established.' No dose is available from this source for a child under 4 years.

Dose independently re-sourced from UK Summary of Product Characteristics (SPC) via the eMC — clinician-reviewed. Always confirm against the product SmPC and your local formulary before prescribing.

Contraindications

  • Known hypersensitivity to lodoxamide or any component of the medicament (§4.3 verbatim)
  • Not a formal §4.3 contraindication but a §4.4 warning: ALOMIDE is not for injection
  • Soft contact lenses during use — benzalkonium chloride may be absorbed by soft lenses and may change their colour; remove lenses before instillation and wait at least 15 minutes before reinsertion (§4.4)

Side effects

  • Ocular discomfort (very common) — the most common adverse reaction in clinical trials
  • Vision blurred, dry eye, eye pruritus, lacrimation increased, ocular hyperaemia (common)
  • Eye pain, eye oedema, asthenopia, corneal deposits, conjunctival oedema, abnormal sensation in eye, foreign body sensation in eyes, eye discharge, eye irritation (uncommon)
  • Corneal erosion, corneal scar, corneal abrasion, anterior chamber cell, corneal epithelium defect, keratitis, blepharitis, eye allergy, visual impairment, eyelid oedema, conjunctival disorder (rare)
  • Dizziness, headache (uncommon); somnolence, dysgeusia (rare)
  • Nausea (uncommon); abdominal discomfort (rare)
  • Eyelid exfoliation (uncommon); rash (rare)
  • Feeling hot (uncommon)
  • Palpitations (not known)
  • Nasal dryness, sneezing (rare)

Monitoring

  • Do not exceed the recommended frequency of administration (§4.4)
  • If initial burning or stinging persists, the patient should be advised to contact the prescribing physician (§4.4)
  • Use with caution in dry eye patients and where the cornea may be compromised — benzalkonium chloride has been reported to cause eye irritation and symptoms of dry eyes, and may affect the tear film and corneal surface (§4.4)
  • Patients should be monitored in case of prolonged use (§4.4)
  • Response is usually evident within a few days, but up to four weeks of treatment is sometimes required (§4.2)

Clinical monograph

How it works

It stabilises mast cells and prevents the antigen-stimulated release of histamine and other inflammatory mediators that drive the ocular allergic response.

Prescribing in practice

  • Acts prophylactically rather than as a rescue treatment, so it should be used regularly and continuously to be effective and may take some days to produce symptomatic benefit.
  • Contact lenses should not be worn during treatment of allergic conjunctivitis, and the preservative may be absorbed by soft lenses.
  • Transient stinging or burning on instillation is common but usually settles.

Monitoring

Treatment is monitored clinically by reviewing symptom control and ocular comfort, with the drops continued throughout the period of allergen exposure.

Counselling the patient

  • Use the drops regularly every day as prescribed, not just when symptoms flare, because they work by preventing reactions.
  • Remove contact lenses before instilling and follow your clinician's advice on when they can be reworn.
  • Mild stinging when you put the drops in is normal and short-lived.

Evidence & guidelines

Mast cell stabilisers are an established option for allergic conjunctivitis and their place in therapy is supported by ophthalmology guidance and the SPC.

Reference: Drug verified in RxNorm (NLM); confirm dosing against the manufacturer SPC (eMC). Verify against your local formulary and current prescribing references before prescribing. The structured dose values shown have been reviewed by a clinician. Monograph status: clinician-reviewed (2026-07-04).

Related

Curated clinical cross-links plus same-class fallbacks.