POM-V Prescription Required

Floron 40 mg/g Premix for Medicated Feeding Stuff for Pigs

Active ingredient: Florfenicol

Form

Premix

Species

Pigs

Manufacturer

KRKA, d.d., Novo mesto

VMD MA No.

01656/4011

What it's used for

be established in the herd before initiating metaphylactic treatment.

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 Florfenicol

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

Floron 40 mg/g Premix for Medicated Feeding Stuff for Pigs — SPC Details

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

be established in the herd before initiating metaphylactic treatment.

Dosage:
10 mg of florfenicol per kg body weight (bw) (equivalent to 250 mg the veterinary
medicinal product) per day administered for 5 consecutive days.
Administration:
For a daily feed intake of 50 g/kg bodyweight, this dosage corresponds to a rate of
incorporation of 5 kg of medicated premix per ton of feed, i.e. 200 ppm of florfenicol.
The rate of incorporation of the medicated premix in the feed may be increased in order
to achieve the required dosage on a mg/kg bodyweight basis and to take into account
AN: 01459/2024 and 01461/2024Page 4 of 7
the actual feed intake. 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:
250 mg of the veterinary
medicinal product per kg
body weight and day
xAverage pig
body weight (kg)
= mg the veterinary medicinal
product per kg of feed
Average daily feed intake (kg/animal)
The maximum rate of incorporation is 12.5 kg/ton (500 ppm of florfenicol), higher rates
of inclusion may lead to poor palatability and decreased food consumption.
Under no circumstances should the incorporation rate of the premix be below 5 kg/ton
of feed.
In all cases the recommended dose of 10 mg of florfenicol per kg of body weight per
day, for 5 consecutive days has to be respected.
To ensure a correct dosage, body weight should be determined as accurately as
possible.
The use of suitably calibrated measuring equipment is recommended.
This veterinary medicinal product should be incorporated by feed manufacturers under
regulatory supervision. Calibrated mixer should be used for incorporation.
It is recommended that the veterinary medicinal product is added to the mixer
containing the feeding stuff ingredients and mixed thoroughly to produce a
homogeneous medicated feeding stuff. The veterinary medicinal product can be
incorporated in pelleted feed preconditioned with steam at a temperature not exceeding
o
C.

Do not use in in case of known resistance to florfenicol.
Do not use in cases of hypersensitivity to the active substance or to any of the
excipients.
See also section 3.7 Use during pregnancy, lactation or lay.
AN: 01459/2024 and 01461/2024Page 2 of 7

Pigs:
Common
(1 to 10 animals / 100 animals
treated):
Diarrhoea*, Rectal prolapse*
Perianal inflammation*
Undetermined frequency
(cannot be estimated from the
available data):
Hypercalcaemia
*The effect is transient, resolves on cessation of the treatment.
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.

Animals showing a decreased appetite and/or a poor general condition should be
treated by the parenteral route.

Special precautions for safe use in the target species:
Use of the 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 product should be in accordance with official, national and regional
antimicrobial policies.
Use of the veterinary medicinal product deviating from the instructions given in the SPC
may increase the prevalence of bacteria resistant to the florfenicol and may decrease
the effectiveness of treatment with other amphenicols, due to the potential for cross-
resistance.
This premix is intended for the manufacturing of solid medicated feed and cannot be
used as is; the incorporation rate of the premix in feed cannot be lower than 5kg/tonne.
This premix contains ground limestone, which can lead to a decrease in food
consumption and to a phosphorus calcium imbalance in feed intake. Care should
therefore be taken to consider the calcium content of the final medicated feeding stuff.
Treatment should not exceed 5 days.
In a field clinical study, within a week after the administration of the last dose, the
incidence of pigs presenting either mild depression and/or mild dyspnea and/or pyrexia
(40°C) was approx. 20% in the initially severely ill animals.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals:
Skin sensitisation may occur.
Avoid skin contact.
Do not handle this veterinary medicinal product in case of known sensitisation to
propylene glycol.
Handle this veterinary medicinal product with care to avoid exposure during
incorporation of premix into feed and administration of medicated feeding stuff to
animals, taking all recommended precautions.
Wear either a disposable half-mask respirator conforming to European standard EN 149
or a non-disposable respirator to European Standard EN 140 with a filter to EN 143,
chemically resistant gloves, protective coveralls and goggles while incorporating the
premix into feed.
Wear gloves and do not smoke, eat, or drink when handling the veterinary medicinal
product or medicated feeding stuff.
Wash hands thoroughly with soap and water after use of the veterinary medicinal
product or medicated feeding stuff.
Rinse thoroughly with water in case of exposure.
If you develop symptoms following exposure such as skin rash, you should seek
medical advice immediately and show the package leaflet or the label to the physician.
AN: 01459/2024 and 01461/2024Page 3 of 7
Special precautions for the protection of the environment:
Not applicable.

No data available.

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

Meat and offal: 14 days
AN: 01459/2024 and 01461/2024Page 5 of 7

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.