Skip to content
POM-V Prescription Required

Rhemox 500 mg/g Powder for Use in Drinking Water for Pigs, Chicken Broilers, Duck Broilers and Turkeys for Meat Production

Active ingredient: Amoxicillin Trihydrate

Form

Powder

Species

Chickens Duck Pigs Turkeys

Manufacturer

Industrial Veterinaria SA

VMD MA No.

36547/4005

What it's used for

Chickens: Treatment of respiratory tract infections and gastro-intestinal tract infections (other than salmonella infections) caused by micro-organisms sus...

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. 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. 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.

Prescription required

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

Clinical information

Rhemox 500 mg/g Powder for Use in Drinking Water for Pigs, Chicken Broilers, Duck Broilers and Turkeys for Meat Production — SPC Details

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

Chickens:
Treatment of respiratory tract infections and gastro-intestinal tract infections (other
than salmonella infections) caused by micro-organisms susceptible to amoxicillin.
In drinking water use and in-feed use in pigs.
In drinking water use in chickens.
Appearance of the product after dissolution in water: Colourless to pale yellowish
solution.
Chickens:
The recommended dosage is 16 mg amoxicillin trihydrate per kg body weight per day
(corresponding to 14 mg amoxicillin/kg body weight, or 20 mg of the veterinary
medicinal product/kg body weight) administered in the drinking water, for 3-5 days.
Pigs:
The recommended dosage is 16 mg amoxicillin trihydrate per kg body weight per day
(corresponding to 14 mg amoxicillin/kg body weight, or 20 mg of the veterinary
medicinal product/kg body weight), for 3-5 days.
AN: 01078/2023Page 4 of 7
In-water use:
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. The intake of
medicated water depends on the clinical condition of the animals and other factors,
like breed and husbandry system (e.g. different temperature, different light regimes).
In order to obtain the correct dosage, the concentration of amoxicillin may need to be
adjusted accordingly.
To ensure a correct dosage, body weight should be determined as accurately as
possible.
The use of suitably calibrated measuring equipment is recommended.
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:
x mg veterinary medicinal
product per kg bodyweight
per day
X
mean body weight
(kg) of animals to be
treated
mean daily water consumption (L)
per animal
=
x mg veterinary
medicinal product per
litre drinking water
Bolus dosage: It is recommended to administer the veterinary medicinal product once
daily via the drinking water for a limited period of time. Restrict access to the drinking
water system for approx. two hours (shorter time in warm weather) until the time of
medication. Scatter the calculated daily quantity of powder on the surface of 5-10
litres water. Mix thoroughly until the powder has dissolved. Mix this solution by
stirring into the volume of drinking water that will be consumed within about 2 hours.
Maximum solubility of the veterinary medicinal product in water is approximately 8 g/L
at room temperature (approximately 20 °C). The maximum solubility can be
considerably reduced at lower temperatures. The complete dissolution of the powder
should be ensured.
Continuous treatment: Preparation of medicated water should provide an amount to
be consumed within the next 12 hours. Any unused medicated water should be
discarded after 12 hours, and freshly medicated water for the next 12 hours should
be prepared. The maximum concentration of the pre-diluted medicated water is
approximately 8 g/L at room temperature (approximately 20 °C). The maximum
solubility can be considerably reduced at lower temperatures. The complete
dissolution of the powder should be ensured. The proportioner setting should be
changed accordingly. In target animal species, water uptake may vary due to various
factors, including environmental temperature, age and type of feed.
Make sure the animals do not have access to non-medicated water during the period
when the medicated water is given. When all medicated water has been consumed,
turn on the normal water supply again. 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.
AN: 01078/2023Page 5 of 7
In-feed use in pigs:
The veterinary medicinal product may also be offered via the feed at the
recommended daily dose. This way of administration is only intended for the
treatment of individual pigs on farms where only a small number of pigs are to
receive the treatment. Only the pack size of 100 g is suitable for the in-feed use.
Larger groups should be treated with medicated drinking water.
Before each administration the powder should be thoroughly mixed into a small
amount of food and should be given directly to the animal before the main ration.
Care should be taken to ensure complete consumption of all medicated feed prior to
providing the remainder of the daily feed ration.
When used in feed for the treatment of individual pigs, the veterinary medicinal
product should be mixed with a sufficient quantity of feed to ensure consumption of
the entire dose prior to providing the remainder of the daily feed ration.
Do not use in cases of hypersensitivity to penicillin, other substances of the beta-
lactam group or to any of the excipients.
Do not use in animals with serious kidney disease including anuria or oliguria.
Do not use in rabbits, guinea pigs, hamsters, gerbils or any other small herbivores.
Do not use in ruminants or horses.
AN: 01078/2023Page 2 of 7
Do not use in the presence of ß-lactamase-producing bacteria.
Pigs, chickens:
Undetermined frequency
(cannot be estimated from the
available data):
Hypersensitivity reaction*
*Allergic reactions may occasionally be serious.
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.
Sick animals may have reduced water and/or feed intake and consequently, may
require parenterally administered medication instead.

Special precautions for safe use in the target species:
Official, national and regional antimicrobial policies should be taken into account
when the veterinary medicinal product is used.
Use of the veterinary medicinal product should be based on susceptibility testing of
the bacteria isolated from the animal. If this is not possible, therapy should be based
on local (regional, farm level) epidemiological information about susceptibility of the
target bacteria.
Use of the veterinary medicinal product deviating from the instructions given in the
SPC may increase the prevalence of bacteria resistant to the amoxicillin and may
decrease the effectiveness of the treatment.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals:
Penicillins may cause hypersensitivity (allergy) following injection, inhalation,
ingestion or skin contact. Hypersensitivity to penicillins may lead to cross sensitivity
to cephalosporins and vice versa. Allergic reactions to these substances may
occasionally be serious.
People with known hypersensitivity to beta-lactam antibiotics should avoid handling
the veterinary medicinal product.
Handle this veterinary medicinal product with care to avoid exposure, taking all
recommended precautions.
Avoid skin and eye contact as this veterinary medicinal product may be irritating.
Do not smoke, eat or drink while handling the veterinary medicinal product.
During preparation and administration of the medicated drinking water, skin contact
with the veterinary medicinal product and inhalation of dust particles should be
avoided. Personal protective equipment consisting of gloves and an appropriate dust
mask (either a disposable half mask respirator conforming to European Standard
EN149 or a non-disposable respirator conforming to European Standard EN140 with
a filter conforming to EN 143) should be worn when handling and mixing the
veterinary medicinal product. Wash hands after use.
In the event of eye or skin contact, rinse the affected area with large amounts of
clean water.
If you develop symptoms following exposure such as skin rash, you should seek
medical advice and show the package leaflet or label to the physician. 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.
AN: 01078/2023Page 3 of 7
Amoxicillin exerts its bactericidal action by inhibition of bacterial cell wall synthesis
during multiplication. It is therefore in principle not compatible with bacteriostatic
antibiotics (e.g. tetracyclines) which inhibit multiplication. Synergism occurs with ß-
lactam antibiotics and aminoglycosides.
The unopened medicinal product does not require any special temperature storage
conditions.
Once opened, do not store above 25 °C.
Store in the original package in order to protect from moisture.
Keep the bag tightly closed.
Pigs: Meat and offal: 2 days.
Chickens: Meat and offal: 1 day.
Not for use in birds producing eggs for human consumption. Do not use within 3
weeks before the start of the laying period.

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.

Medication costs adding up?

Pet insurance can cover prescription medications. Find the right policy for your pet.

Compare insurance

Find cheaper vets near you

Compare vet consultation prices in your area. Save on procedures and get a prescription to buy medications online.