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POM-V Prescription Required Companion Animal

Isathal 10 mg/g Eye Drops, Suspension for Dogs, Cats and Rabbits

Active ingredient: Fusidic Acid

Form

Drops

Species

Cats Dogs Rabbits

Manufacturer

Dechra Veterinary Products A/S

VMD MA No.

24883/4003

What it's used for

Cats: For the topical treatment of conjunctivitis associated with secondary staphylococcal infections. Rabbits:For the topical treatment of conjunctivitis...

Full indications, dosage and side effects ↓
View official SPC (PDF)

The prescription itself has a price. See what practices near you charge for a consultation and the written prescription fee.

Paying less for Fusidic Acid

  1. 1

    Ask your vet for a written prescription

    They must provide one on request. Under the CMA Order the fee is capped at £21 from 2027.

  2. 2

    Fill it at a registered online retailer

    The CMA found online pharmacies 50–60% cheaper than practice dispensing on common medicines — typically £200–£300 a year.

Prescription required

Your vet must provide a written prescription on request. You can then purchase from any licensed online retailer.

Clinical information

Isathal 10 mg/g Eye Drops, Suspension for Dogs, Cats and Rabbits — SPC Details

Source: VMD Summary of Product Characteristics (SPC). Last updated 27 Mar 2026.

Cats: For the topical treatment of conjunctivitis associated with secondary
staphylococcal infections.
Rabbits:For the topical treatment of conjunctivitis associated with staphylococcal
infections.
External use only.
One drop of the veterinary medicinal product should be instilled into the eye once or
twice daily. Treatment should be continued for at least 24 hours after the eye has
returned to normal.
If a clinical response is not evident after 5 days following the commencement of
administration, the diagnosis should be re-established.
If the animal has one infected eye, it may be advisable to treat both eyes to prevent
cross infection. In such cases, it is better to treat the uninfected eye first to avoid
transferring infection via the tube nozzle.
Do not use in conjunctivitis associated with Pseudomonas spp.
Do not use in cases of hypersensitivity to the active substance or to any of the
excipients.
Dogs, cats, rabbits:
Very rare
(<1 animal / 10,000 animals treated,
including isolated reports):
Allergic reaction
a
, Hypersensitivity
reaction
a
a
Discontinue use if hypersensitivity to the product develops.
Reporting adverse events is important. It allows continuous safety monitoring of a
veterinary medicinal product. Reports should be sent, preferably via a veterinarian, to
either the marketing authorisation holder or its local representative or the national
competent authority via the national reporting system. See the package leaflet for
respective contact details.
In cats, the possibility of a primary cause of the conjunctivitis should be investigated
and treated if possible.
In rabbits, conjunctivitis may be associated with dacryocystitis and/or dental disease.
In such cases, appropriate additional treatment should be instituted.

Special precautions for safe use in the target species:
Use of the veterinary medicinal product should be based on identification and
susceptibility testing of the target pathogen(s). If this is not possible, therapy should
be based on epidemiological information and knowledge of susceptibility of the target
pathogens at farm level, or at local/regional level.
Use of the veterinary medicinal product should be in accordance with official, national
and regional antimicrobial policies. Using the veterinary medicinal product other than
as indicated in the SPC may increase the number of bacteria resistant to fusidic acid.
When the tube is squeezed, the veterinary medicinal product comes out as a thick
(viscous) drop. The drop quickly becomes liquid on contact with tear fluid and does
not affect the sight.
Care should be taken to avoid contamination of the contents during use and to avoid
the nozzle coming into direct contact with the eye. Avoid fingers touching the tube
nozzle.
Do not use the same tube to treat different animals.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals:
Wash hands after applying the veterinary medicinal product.
Special precautions for the protection of the environment:
Not applicable.
None known.
Do not store above 25 ˚C.
Replace the cap between applications.
Following withdrawal of first dose, use the product within 1 month.
Not for use in rabbits intended for human consumption.

This information is sourced from the official Summary of Product Characteristics (SPC) published by the Veterinary Medicines Directorate (VMD). It is provided for informational purposes only and does not replace professional veterinary advice. Always consult your vet before administering any medication.

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