POM-V Prescription Required

Neomay 500 000 IU/g Powder for Use in Drinking Water/Milk Replacer

Active ingredient: Neomycin

Form

Powder

Species

Cattle Chickens Duck Goose Partridge Pigs Quail Turkeys

Manufacturer

Laboratorios Maymo S.A.U.

VMD MA No.

42204/4001

What it's used for

For the treatment of mastitis in lactating cattle. The product is effective against Staphylococcus species (both penicillinase and non-penicillinase produc...

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 Neomycin

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

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.

Your prescription rights → VMD register of retailers →

Prescription required

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

Clinical information

Neomay 500 000 IU/g Powder for Use in Drinking Water/Milk Replacer — SPC Details

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

For the treatment of mastitis in lactating cattle. The product is effective
against Staphylococcus species (both penicillinase and non-penicillinase
producers) including Staphylococcus aureus, Streptococcus species
including Streptococcus agalactiae, Streptococcus dysgalactiae and
Streptococcus uberis, and coliform bacteria including Escherichia coli.

25 000 IU of neomycin per kg bodyweight per day for 3 to 4 consecutive days,
corresponding to 5 g of veterinary medicinal product per 100 kg bodyweight per day
for 3 to 4 days.
Based on the recommended dose and the number and weight of animals to be
treated, the exact daily concentration of the veterinary medicinal product should be
calculated according to the following formula:
g of product/kg bodyweight day x average bodyweight (kg) of
g of veterinary medicinal product = animals to be treated
per l of drinking water/milk replacer Average daily water/milk replacer intake (l/
animal)
To ensure a correct dosage body weight should be determined as accurately as
possible. The use of suitably calibrated measuring equipment is recommended.
The intake of medicated water depends on the clinical condition of the animals. In
order to obtain the correct dosage the concentration of neomycin may needto be
adjusted accordingly.
The maximum solubility of the powder is 255 000 IU of neomycin/ml (510 g of
veterinary medicinal product/L) of water.
For the administration of the veterinary medicinal product commercially available
dosing pumps can be used.

Do not use in cases of hypersensitivity to the active substance, to aminoglycosides or
to any of the excipients.
Do not use in cases of intestinal obstruction.

None known.
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 immediate packaging
for respective contact details.

Medicated drinking water intake can be affected by the severity of the disease. In
case of insufficient intake of water/milk replacer, calves and pigs should be treated
parenterally.
AN: 01462/2024 & 01463/2024Page 2 of 6

Special precautions for safe use in the target species:
Powder for oral solution that is to be dissolved in water and cannot be used as it is.
Special care should be taken when considering administration of the veterinary
medicinal product to the newborn calf due to the known higher gastrointestinal
absorption of neomycin in neonates. This higher absorption could lead to an
increased risk of oto- and nephrotoxicity. The use of the veterinary medicinal product
in neonates should be based on the benefit/risk determination from the attending
veterinarian.
Use of the veterinary medicinal product product should be based on susceptibility
testing of the bacteria isolated from the animal. If this is not possible, therapy should
be based on local (regional, farm level) epidemiological information about
susceptibility of the target bacteria. Official, national and regional antimicrobial policies
should be taken into account when the veterinary medicinal product is used.
Use of the veterinary medicinal product product deviating from the instructions given
in the SPC may increase the prevalence of bacteria resistant to neomycin and may
decrease the effectiveness of treatment with aminoglycosides due to the potential for
cross-resistance.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals
People with known hypersensitivity to aminoglycosides should avoid contact with the
veterinary medicinal product.
Wash hands after use.
In case of accidental spillage onto skin, seek medical advice immediately and show
the package leaflet or the label to the physician. Swelling of the face, lips or eyes or
difficulty with breathing are more serious symptoms and require urgent medical
attention.
Special precautions for the protection of the environment:
Not applicable.

General anaesthetics and muscle relaxing products increase the neuro-blocking
effect of aminoglycosides. This may cause paralysis and apnoea.
Special care should be taken when using concurrently with diuretics and potentially
oto- or nephrotoxic substances.

This veterinary medicinal product does not require any special storage conditions.

Cattle (Calves).
Meat and offal: 14 days.
Pigs (weaned and fattening pigs)
Meat and offal: 3 days
Chickens (including laying hens), ducks, turkeys, turkey hen, goose, quail and partridge.
Meat and offal: 14 days.
Eggs: zero days.
4.

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.