POM-V Prescription Required

Phenocillin 800 mg/g Powder for Use in Drinking Water for Chickens

Active ingredient: Phenoxymethylpenicillin

Form

Powder

Species

Chickens

Manufacturer

Eurovet Animal Health B.V.

VMD MA No.

16849/4054

What it's used for

For the treatment and metaphylaxis of necrotic enteritis caused by Clostridium perfringens. The disease must have been currently diagnosed in the flock bef...

Full indications, dosage and side effects ↓

View official SPC (PDF)

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Paying less for Phenoxymethylpenicillin

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

Phenocillin 800 mg/g Powder for Use in Drinking Water for Chickens — SPC Details

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

For the treatment and metaphylaxis of necrotic enteritis caused by Clostridium
perfringens. The disease must have been currently diagnosed in the flock before
metaphylactic use.

17 – 25 mg of the product per kg body weight per day, for 5 days.
Method of administration: oral use, dissolve in drinking water and use within 12
hours. The maximum solubility is 100 g product per litre drinking water.
The following calculation may be used to determine the quantity in grams of the
product to be added to 1000 litres of water:
mg product/kg
body weight/day
x
mean body weight
of individual
animals (kg)
x
number of
animals
Total water consumption (litre) of the group to be treated
on the previous day
=
mg
product
/litre
=
g
product/
1000 l
water
To calculate correctly the amount of powder required, the use of calibrated weighing
equipment is recommended. Taking into account that sick animals may drink less, it
is recommended to start therapy with the highest authorised dose, to compensate for
a possible lower intake of medicated water.
To ensure correct dosage, the body weight of the animals should be determined as
accurately as possible to avoid under dosing.
No other source of drinking water should be available during the medication period.
In cases of altered drinking water consumption in chickens, the concentration should
be adjusted so that the recommended dosage is achieved. After the end of the
treatment period, the water supply system should be cleaned to avoid subsequent
intake of sub-therapeutic amounts of the active substance.

Do not use in known cases of hypersensitivity to the active substance, other
substances of the beta-lactam group or to any of the excipients.

Although no adverse reactions have been observed after the administration of the
product, penicillins may cause vomiting, diarrhoea and alter gut flora by selecting
resistant bacteria.

Revised: March 2021
AN: 00258/2020

None.

Revised: March 2021
AN: 00258/2020

Special precautions for use in animals
Use of the product should be based on susceptibility testing of bacteria isolated from
the animals on the farm. If this is not possible, therapy should be based on local
(regional, farm level) epidemiological information about susceptibility of the target
bacteria. The product should not be used to compensate for poor hygiene and
management of the farm houses.
Use of the product deviating from the instructions given in the SPC may increase the
prevalence of bacteria resistant to phenoxymethylpenicillin and may decrease the
effectiveness of treatment with other penicillins, due to the potential for cross-
resistance. Official, national and regional antimicrobial policies should be taken into
account when the product is used.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals
Penicillins, such as phenoxymethylpenicillin may cause hypersensitivity (allergy)
following inhalation, ingestion or skin contact. Hypersensitivity to
phenoxymethylpenicillin may lead to cross-sensitivity to other penicillins and
cephalosporins and vice versa. Allergic reactions to these substances may
occasionally be serious.
1. Do not handle this product if you know you are sensitised, or if you have been
advised not to work with such preparations.
2. Handle this product with great care to avoid exposure, taking all recommended
precautions.
3. If you develop symptoms following exposure such as a skin rash you should seek
medical advice and show the doctor this warning. Swelling of the face, lips or
eyes or difficulty with breathing, are more serious symptoms and require urgent
medical attention.
Persons handling this product should avoid inhalation of any dust and contact with
skin. Wear protective clothing, impervious gloves and either a disposable half mask
respirator conforming to European Standard EN149 or a non-disposable respirator
conforming to European Standard EN140 with a filter to EN143 when mixing and
handling the product.
Hands and exposed skin should be washed thoroughly after use.

This veterinary medicinal product should not be combined with bacteriostatic
antibiotics.

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

Meat and offal: 2 days.
Eggs: zero 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.