POM-V Prescription Required

Amphen 200 mg/ml Suspension for Use in Drinking Water for Pigs

Active ingredient: Florfenicol

Form

Suspension

Species

Pigs

Manufacturer

Huvepharma NV

VMD MA No.

30282/5005

What it's used for

Treatment and metaphylaxis at the group level where clinical signs of swine respiratory diseases associated with Actinobacillus pleuropneumoniae and Pasteu...

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.

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Prescription required

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

Clinical information

Amphen 200 mg/ml Suspension for Use in Drinking Water for Pigs — SPC Details

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

Treatment and metaphylaxis at the group level where clinical signs of swine
respiratory diseases associated with Actinobacillus pleuropneumoniae and
Pasteurella multocida
The presence of the disease in the group must be established before the
product is used.

Do not use in cases of hypersensitivity to the active substance or to any of the
excipients. See also section 3.7 for further information.

Revised: August 2025
AN: 00843/2025

Pigs:
Very common (>1 animal / 10
animals treated)
Diarrhoea
Erythema
Oedema
Undetermined frequency
(cannot be estimated from the
available data)
Decreased drinking
Constipation
Abnormal stool colouration
Rectal prolapse
1
perianal or rectal
dark brown
retroceding without 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 the national
competent authority via the national reporting system. See the package leaflet
for respective contact details.

Do not use the product with chlorinated water.
The uptake of medication by animals may be altered as a consequence of
illness. In case of insufficient water intake, animals should be treated
parenterally using a suitable injectable product prescribed by the veterinarian.

Special precautions for use in animals
In addition to medication, it is important to ensure proper husbandry conditions,
including good hygiene, proper ventilation and avoiding crowded conditions
Use of the product should be based on identification and susceptibility testing of
the target pathogens. 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.
An antibiotic with a lower risk of antimicrobial resistance selection (lower AMEG
category) should be used for first line treatment where susceptibility testing
suggests the likely efficacy of this approach.
Not for use for prophylaxis.
The duration of treatment should not exceed 5 days.
Special precautions to be taken by the person administering the veterinary
medicinal product to animals
This veterinary medicinal product may cause hypersensitivity reactions.
People with known hypersensitivity to florfenicol or sodium benzoate should
avoid contact with the veterinary medicinal product.
This veterinary medicinal product may be slightly irritating to the skin and eyes.
Avoid skin or eye contact, including hand-to-eye-contact.
This veterinary medicinal product may be harmful when ingested, including
effects on male fertility. Avoid oral ingestion, including hand-to-mouth-contact
when preparing the product. Do not eat, drink or smoke while handling this
product.
Personal protective equipment consisting of gloves, clothing and safety glasses
should be worn when handling and mixing the veterinary medicinal product.

Revised: August 2025
AN: 00843/2025
In case of accidental spillage onto eyes, wash them immediately with water. In
case of accidental spillage onto skin, wash immediately the affected area and
take the contaminated clothes off.
Wash hands after use.
If you develop symptoms following exposure such as skin rash, seek medical
advice immediately and show the package leaflet or the label to the physician.
Special precautions for the protection of the environment
The use of the veterinary medicinal product poses a risk to terrestrial organisms
(plants) and aquatic organisms (cyanobacteria), including groundwater
organisms.
In order to prevent any adverse effects on terrestrial plants and algae and
possible contamination of groundwater, manure from treated pigs must not be
spread onto land without dilution with manure from untreated pigs. Manure from
treated pigs must be diluted with at least 5 times the weight of manure from
untreated pigs before it can be spread onto arable land or before the manure is
traded.

See section 4.4 for further information.

Product as packaged for sale and after first opening: Do not store above 25°C.
Do not freeze. Protect from frost.

Accuracy of the dosing device should be thoroughly checked.
Shake the bottle vigorously for 60 seconds before use. The product should be
added to the water. Prepare the solution with fresh potable water.
For water tanks:
The maximal solubility is reached at concentrations of 2 mL/L (0.4 g of
florfenicol/L), 2.5 mL/L (0.5 g of florfenicol/L) and 3 ml/L (0.6 g of florfenicol/L)
at respectively 4°C, 10°C and 20°C. Solutions should be checked visually for
complete dissolution.
To treat pigs drinking 10% of their bodyweight, at the dose of 10 mg/kg, add the
veterinary medicinal product to the drinking water in the tank.
Use 1 L of product for every 2000 L of water. This corresponds to a
concentration of 0.10 g florfenicol /L in the drinking water.
Mix thoroughly, to achieve full dissolution the solution should be stirred
vigorously using a manual whisk for 10 minutes. When using a magnetic stirrer
at 100 rpm, the mixing time is of 5 minutes.
For dosing pumps:
The veterinary medicinal product can only be used at a concentration of 50
mL/L i.e. 10 g of florfenicol per litre of water of stock solution.
To treat pigs drinking 10% of their bodyweight, at the dose of 10 mg/kg, add the
veterinary medicinal product to the water in the reservoir of the dosing pump.
Add 1 L of product to 20 L of unmedicated water. This corresponds to a
concentration of 10 g/L in the stock solution.
Mix thoroughly using a manual whisk for 10 minutes or automatic stirring device
operating 840 rpm for 5 min until a homogeneous white milky suspension is
obtained.
Set the dosing pump on 1 % and turn on the dosing pump.
Medicated drinking water should be replaced every 24 hours.
After the end of the medication period the water supply system should be
cleaned appropriately to avoid intake of sub-therapeutic amounts of the active
substance .
4.10 Overdose (symptoms, emergency procedures, antidotes), if necessary
In case of overdosing, a decrease in weight gain, food and water consumption,
peri-anal erythema and oedema and modification of some haematological and
biochemical parameters indicative of dehydration may be observed.
4.11 Withdrawal period(s)
Meat and offal: 20 days

Revised: August 2025
AN: 00843/2025
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.