POM-V Prescription Required

Fenflor 300 mg/ml Solution for Injection for Pigs

Active ingredient: Florfenicol

Form

Injection

Species

Pigs

Manufacturer

KRKA, d.d., Novo mesto

VMD MA No.

01656/5065

What it's used for

Treatment of acute outbreaks of respiratory disease caused by strains of Actinobacillus pleuropneumoniae and Pasteurella multocida susceptible to florfenic...

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

Fenflor 300 mg/ml Solution for Injection for Pigs — SPC Details

Source: VMD Summary of Product Characteristics (SPC). Last updated 26 Mar 2026.

Treatment of acute outbreaks of respiratory disease caused by strains of Actinobacillus
pleuropneumoniae and Pasteurella multocida susceptible to florfenicol.

Intramuscular use.
15 mg/kg bodyweight (1 ml per 20 kg) by intramuscular injection into the neck muscle
twice at 48 hour intervals using a dry, sterile 16-gauge needle.
The volume administered per injection site should not exceed 3 ml.
It is recommended to treat animals in the early stages of disease and to evaluate the
response to treatment within 48 hours after the second injection.
If clinical signs of respiratory disease persist 48 hours after the last injection, treatment
should be changed using another formulation or another antibiotic and continued until
clinical signs have resolved.
To ensure a correct dosage, body weight should be determined as accurately as
possible.

Do not administer to boars intended for breeding.
Do not use in case of hypersensitivity to the active substance or to any of the excipients.
Do not use in cases of known resistance to the active substance.

Pigs:
Very common
(>1 / 10 animals treated):
Diarrhoea
Peri-anal and rectal erythema/oedema
Pyrexia (40 °C) associated with either moderate
depression or moderate dyspnea
Undetermined frequency
(cannot be estimated from the
available data):
Injection site swelling
Injection site inflammation
May affect up to 50% of the animals; can be observed for one week.
Approximately 30% of treated pigs presented with week or more after administration of
the second dose.
May last up to 5 days.
May last up to 28 days.
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 the national competent authority via the
national reporting system. See the package leaflet for respective contact details.

Revised: November 2023
AN: 03907/2022

None

Special precautions for use in animals
Wipe the stopper before removing each dose. Use a dry, sterile syringe and needle.
Do not use in piglets of less than 2 kg.

Revised: November 2023
AN: 03907/2022
The product should be used in conjunction with susceptibility testing and take into
account official and local antimicrobial policies.
Use a suitable draw-off needle or automatic dosing syringe to avoid excessive
puncturing of the closure.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals
Care should be taken to avoid accidental self-injection.
In case of accidental self-injection, seek medical advice immediately and show the
package leaflet or the label to the physician.
People with known hypersensitivity to florfenicol, propylene glycol and polyethylene
glycols should avoid contact with the veterinary medicinal product.
In case of accidental contact with eyes, rinse immediately with plenty of water.
Special precautions for the protection of the environment
Not applicable.
Other precautions
Not applicable.

No data available.

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

Meat and offal: 18 days
5.

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.