POM-V Prescription Required

Huvacillin 800 mg/g Powder for Use in Drinking Water for Chickens and Pigs

Active ingredient: Amoxicillin Trihydrate

Form

Powder

Species

Chickens Pigs

Manufacturer

Huvepharma N.V.

VMD MA No.

30282/3000

What it's used for

In pigs: Treatment of respiratory tract, gastrointestinal and urogenital infections, infections secondary to viral diseases and septicaemia.

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 Amoxicillin Trihydrate

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

Huvacillin 800 mg/g Powder for Use in Drinking Water for Chickens and Pigs — SPC Details

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

In pigs:
Treatment of respiratory tract, gastrointestinal and urogenital infections, infections
secondary to viral diseases and septicaemia.

Chickens:
The recommended dosage is 23.0 mg amoxicillin trihydrate per kg bodyweight per
day, equivalent to 20 mg of amoxicillin/kg of bodyweight/day (corresponding to 28.8
mg veterinary medicinal product/kg bodyweight/day) for 3 to 5 consecutive days.
Pigs:
The recommended dosage is 12.9 mg amoxicillin trihydrate per kg bodyweight,
equivalent to 11.2 mg amoxicillin/bodyweight/day, (corresponding 16.1 mg veterinary
medicinal product/kg bodyweight/day) for 3 to 5 consecutive days.
For the preparation of medicated water, the body weight of the animals to be treated
and their actual daily water consumption should be taken into account. Consumption
may vary depending on factors like species, age, state of health, breed and
husbandry system (e.g. different temperature, different light regimes). In order to
obtain the correct dosage, the concentration of amoxicillin has to be adjusted
accordingly.
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:
mg veterinary medicinal
product / per kg
bodyweight per day
X
Average body
weight (kg) of
animals to be
treated
average daily water intake (L/animal)
= mg veterinary
medicinal product per
litre of
drinking water
To ensure a correct dosage, bodyweight should be determined as accurately as
possible.
The required amount of veterinary medicinal product should be weighed as
accurately as possible using suitability calibrated weighing equipment.
All animals to be treated should have sufficient access to the water supply system to
ensure adequate consumption of the medicated drinking water.
In order to ensure consumption of the medicated water, animals should not have
access to other water supplies whilst being treated.
Prepare the solution with fresh potable water.
Complete dissolution of the veterinary medicinal product should be ensured by gently
mixing the veterinary medicinal product until fully dissolved. The homogeneity of the
medicated drinking water should be kept during the administration to animals. Any
unused medicated water should be discarded after 24 hours and the medicated
drinking water replenished.
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,
When using a water tank, it is recommended to prepare a stock solution and to dilute
it to the target final concentration. Turn off the water supply to the tank until all the
medicated solution is consumed.
For stock solutions, take care not to exceed the maximum solubility of the veterinary
medicinal product, i.e. 3 g/L in soft/hard water at 5°C or 8g/L at 20°C.
When using a proportioner, adjust flow rate settings of the dosing pump according to
the concentration of the stock solution and water intake of the animals to be treated.
Care should be taken that the intended dose will be completely ingested.

Do not use in horses, rabbits, guinea pigs, hamsters, gerbils or any other small
herbivores given that amoxicillin, as for all aminopenicillins, has a deleterious effect
on caecal bacteria.
Do not use in ruminants.
Do not use in animals with hypersensitivity to penicillins or other ß-lactam antibiotics
or to any of the excipients.
Do not use in animals with renal disease including anuria or oliguria.
Do not use in the presence of ß-lactamase-producing bacteria, as the veterinary
medicinal product is not effective against them.

Chickens (for reproduction, broiler, pullet), pigs
Undetermined frequency
(cannot be estimated from the
available data)
Hypersensitivity reaction (varying from allergic
skin reaction to anaphylactic shock)
Digestive tract disorders (vomiting, diarrhoea)
Immediately stop administering the veterinary medicinal product.
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.

The uptake of medication by animals may be altered as a consequence of illness. In
case of insufficient water/feed uptake, animals should be treated parenterally instead
using a suitable injectable veterinary medicinal product prescribed by the
veterinarian.
Cross-resistance has been shown between amoxicillin and other penicillins, in
particular amino-penicillins in bacteria susceptible to amoxicillin. Use of the veterinary
medicinal product/amoxicillin should be carefully considered when antimicrobial
susceptibility testing has shown resistance to penicillins because its effectiveness
may be reduced.

Special precautions for safe use in the target species:
Use of the veterinary medicinal 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 veterinary medicinal 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 amoxicillin and may
decrease the effectiveness of treatment with other penicillins, due to the potential for
cross-resistance.
Narrow spectrum antibacterial therapy with a lower risk of antimicrobial resistance
selection should be used for first line treatment where susceptibility testing suggests
the likely efficacy of this approach.
Do not leave medicated water available to other animals.
Repeated and protracted use should be avoided by improving management practices
through cleaning and disinfection.
Prolonged use of the veterinary medicinal product can induce intestinal bacterial flora
alteration and favour the development of non-sensitive microorganisms.
The antimicrobial should not be used as part of heard health programmes.
Not for use for prophylaxis.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals:
Penicillins and cephalosporins may cause hypersensitivity (allergy) following
injection, inhalation, ingestion or skin contact. Hypersensitivity to penicillins may lead
to cross reactions to cephalosporins and vice versa. Allergic reactions to these
substances may occasionally be serious.
This veterinary medicinal product may be irritating to the respiratory tract.
People with known hypersensitivity to beta-lactam antibiotics should avoid handling
the veterinary medicinal product.
Handle this veterinary medicinal product with great care to avoid exposure, taking all
recommended precautions.
Avoid inhalation of dust. Wear either a disposable half-mask respirator conforming to
European Standard EN149 or a non-disposable respirator to European Standard
EN140 with a filter to EN143.
Wear gloves when handling the veterinary medicinal product or the medicated water.
Wash hands after use. Wash any exposed skin after handling the veterinary
medicinal product or medicated water.
In the event of eye or skin contact , rinse the affected area with large amounts of
clean water.
Do not smoke, eat or drink while handling the veterinary medicinal product. In case of
accidental ingestion, immediately rinse the mouth with water and seek medical
advice.
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.
Special precautions for the protection of the environment:
Not applicable.

Do not combine with bacteriostatic antibiotics.
Synergism with other beta-lactam antibiotics and aminoglycosides may occur.
Do not use simultaneously with neomycin since it blocks the absorption of oral
penicillins.
Do not use together with antibiotics which inhibit bacterial protein synthesis as they
can antagonise the bactericidal effect of penicillins.

Do not refrigerate or freeze.
Store in the original container in order to protect from light and moisture.
Keep the container tightly closed in order to protect from moisture.
Store in a dry place.

Chickens: Meat and offal: 1 day.
Pigs: Meat and offal: 2 days.
Not for use in birds producing or intended to produce eggs for human consumption.

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.