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POM-V Prescription Required

Kriptazen 0.5 mg/ml Oral Solution for Calves

Active ingredient: Halofuginone

Form

Liquid

Species

Cattle

Manufacturer

Virbac

VMD MA No.

EU/2/18/234/001-006

What it's used for

Administration should start in the first 24 to 48 hours of age. Reduction of diarrhoea due to diagnosed Cryptosporidium parvum. Administration should start...

Full indications, dosage and side effects ↓
View official SPC (PDF)

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Paying less for Halofuginone

  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

Kriptazen 0.5 mg/ml Oral Solution for Calves — SPC Details

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

Administration should start in the first 24 to 48 hours of age.
Reduction of diarrhoea due to diagnosed Cryptosporidium parvum.
Administration should start within 24 hours after the onset of diarrhoea.
In both cases, the reduction of oocysts excretion has been demonstrated.
To be administered after feeding.
The dosage is: 100 mcg of halofuginone base / kg body weight (BW) / once a day for
7 consecutive days, i.e. 2 ml of the veterinary medicinal product / 10 kg BW / once a
day for 7 consecutive days.
However, in order to make the treatment easier, a simplified dosage scheme is
proposed:
▪≤
during 7 consecutive days
▪
during 7 consecutive days
For smaller or higher weights, a precise calculation should be performed (2 ml/10 kg
BW).
Underdosing could result in ineffective use and may favour resistance development.
To ensure a correct dosage, body weight should be determined as accurately as
possible.
The use of suitably calibrated measuring equipment is recommended.
The consecutive treatment should be done at the same time each day.
Once the first calf has been treated, all the forthcoming new-born calves must be
systematically treated as long as the risk for diarrhoea due to Cryptosporidium
parvum persists.
Do not use on an empty stomach.
Do not use in case of diarrhoea established for more than 24 hours and in weak
animals.
Do not use in cases of hypersensitivity to the active substance or to any of the
excipients.
Cattle (newborn calf):
Very rare
(<1 animal / 10,000 animals
treated, including isolated
reports):
Diarrhoea
1
an increase in the level of diarrhoea has been observed.
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.
Unnecessary use of antiparasitics or use deviating from the instructions given in the
SPC may increase the resistance selection pressure and lead to reduced efficacy.
The decision to use the product should be based on confirmation of the parasitic
species and burden, or risk of infection based on its epidemiological features, for
each herd.

Special precautions for safe use in the target species:
Administer after colostrum feeding, or after milk or milk replacer feeding only, using
either a syringe or any appropriate device for oral administration.
Do not use on an empty stomach.
For treatment of anorexic calves, the product should be administered in half a litre of
an electrolyte solution. The animals should receive enough colostrum according to
good breeding practice.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals:
Repetitive contact with the product may lead to skin allergies.
Avoid skin, eye and mucosal contact with the veterinary medicinal product.
People with known hypersensitivity to halofuginone should administer the veterinary
medicinal product with caution.
Personal protective equipment consisting of gloves should be worn when handling
the veterinary medicinal product.
In case of accidental spillage onto skin or eye contact wash the exposed area
thoroughly with clean water. If eye irritation persists, seek medical advice
immediately and show the package leaflet or the label to the physician.
Wash hands after use.
Special precautions for the protection of the environment:
Not applicable.
Other precautions:
Not applicable.
None known.
This veterinary medicinal product does not require any special storage conditions.
Meat and offal: 13 days.

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.

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