POM-V Prescription Required

Mycoflor, 300 mg/ml Solution for Injection for Cattle and Pigs

Active ingredient: Florfenicol

Form

Injection

Species

Cattle Pigs

Manufacturer

SP Veterinaria, S.A.

VMD MA No.

36967/3004

What it's used for

Cattle: Treatment of respiratory tract infections due to strains of haemolytica, Pasteurella multocida florfenicol. Pigs: Treatment of acute outbreaks of s...

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

Mycoflor, 300 mg/ml Solution for Injection for Cattle and Pigs — SPC Details

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

Cattle: Treatment of respiratory tract infections due to strains of
haemolytica, Pasteurella multocida
florfenicol.
Pigs: Treatment of acute outbreaks of swine respiratory disease caused by
strains of and
susceptible to florfenicol.

To ensure a correct dosage body weight should be determined as accurately as
possible to avoid underdosing. The vial cannot be broached more than 25
times.
Cattle: IM injection of 20 mg/kg BW (1ml/15kg) into the neck muscle twice 48
hours apart. The volume administered per injection site should not exceed
10 ml. Subsequent injections must be given at different sites.
Pigs: IM injection of 15 mg/kg BW (1 ml/20 kg) into the neck muscle, twice, 48
hour apart. The volume administered per injection site should not exceed 3 ml.
Subsequent injections must be given at different sites.
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.
Ensure that the injection site is clean before administration of the product

Revised: July 2024
AN: 00133/2024 & 00266/2024

Do not use in adult bulls and boars intended for breeding purposes.
Do not use in piglets of less than 2 kg.
Do not use in known cases of hypersensitivity to the active substance or to any
of the excipients.
Do not administer intravenously.
Do not use in known cases of resistance to the active substance.

Cattle:
A decrease in food consumption and transient softening of the faeces may
occur during the treatment period. The treated animals recover quickly and
completely upon termination of treatment.
Administration of the product by the intramuscular route may cause
inflammatory lesions at injection site which persist for 14 days.
On very rare occasions, anaphylactic reactions were observed
Pigs:

Revised: July 2024
AN: 00133/2024 & 00266/2024
Commonly observed adverse effects are transient diarrhoea and/or peri-anal
and rectal erythema/oedema which may affect 50% of the animals. These
effects can be observed for one week.
Transient swelling lasting up to 5 days may be observed at the site of injection.
Inflammatory lesions at the injection site may be seen up to 28 days.
Under field conditions, approximately 30% of treated pigs may present with
pyrexia (40
o
C) associated with either moderate depression or moderate
dyspnoea a week or more after administration of the second dose.
The frequency of adverse reactions is defined using the following convention:
very common (more than 1 in 10 animals displaying adverse reactions during
the course of one treatment)
common (more than 1 but less than 10 animals in 100 animals)
uncommon (more than 1 but less than 10 animals in 1,000 animals)
rare (more than 1 but less than 10 animals in 10,000 animals)
very rare (less than 1 animal in 10,000 animals, including isolated reports).

None.

Revised: July 2024
AN: 00133/2024 & 00266/2024

Special precautions for use in animals
The product should be used in conjunction with susceptibility testing and take
into account official and local antimicrobial policies.
The stopper must be cleaned before removing each dose. Use a dry, sterile
syringe and needle.
Use of the product deviating from the instructions given in the SPC may
increase the prevalence of bacteria resistant to florfenicol
the effectiveness of treatment with other antimicrobials, due to the potential for
cross-resistance.
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.
Avoid direct contact with skin, mouth and eyes. If eye exposure occurs, flush
eyes immediately with clean water. If skin exposure occurs, wash the affected
area with clean water. If accidental ingestion occurs, rinse the mouth with plenty
of water and seek medical advice immediately.
Wash hands after use.
People with known hypersensitivity to florfenicol should avoid contact with the
veterinary medicinal product.
Do not smoke, eat or drink while handling this product.
Laboratory studies in rabbits and rats with the excipient N-methyl pyrrolidone
have shown evidence of foetotoxic effects. Women of childbearing age,
pregnant women or women suspected of being pregnant should use the
veterinary medicinal product with serious caution to avoid accidental self-
injection
Other precautions:
The use of this veterinary medicinal product may pose a risk for terrestrial
plants, cyanobacteria and groundwater organisms.

interaction
No data available.

This veterinary medicinal product does not require any special temperature
storage conditions.
Keep the bottle in the outer carton in order to protect from light.

Cattle:
Meat and offal: 34 days
Milk: Not authorised for use in animals producing milk for human consumption.
Pigs:
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.