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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.

05653/5012

What it's used for

In new born calves: -Cryptosporidium parvum, in farms with history of cryptosporidiosis. Administration should start in the first 24 to 48 hours of age. -C...

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 26 Mar 2026.

In new born calves:
-Cryptosporidium parvum, in farms
with history of cryptosporidiosis.
Administration should start in the first 24 to 48 hours of age.
-Cryptosporidium parvum.
Administration should start within 24 hours after the onset of diarrhoea.
In both cases, the reduction of oocysts excretion has been demonstrated.
For oral use in calves after feeding.
The dosage is: 100 μg of halofuginone / kg bw, once a day for 7 consecutive days;
i.e. 2 ml of Kriptazen / 10 kg bw, once a day for 7 consecutive days.
The consecutive treatment should be administered 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 C. parvum persists.
Bottle without a pump: To ensure a correct dosage, the use of either a syringe or any
appropriate device for oral administration is necessary.
Bottle with a pump: To ensure a correct dosage, the most appropriate metering pump
should be selected, depending on the weight of the animals to be treated. In cases
where the dosing pump is unsuitable for the weight of animals to be treated, either a
syringe or any other appropriate device can be used.
4 ml pump
1) Choose the dip tube designed for the height of the bottle (the shorter one for the
490 ml bottle and the longer one for the 980 ml bottle) and insert it into the free hole
located in the base of the pump cap.
2) Remove the cap and the protective seal from the bottle and screw the pump on.
3) Remove the protector cap from the tip of the nozzle of the pump.
4) Prime the pump by pressing the trigger gently, until a drop appears at the tip of the
nozzle.
5) Restrain the calf and insert the nozzle of the metering pump into its mouth
6) Pull the trigger of the metering pump completely for release of a dose that equals
4 ml of solution. Pull two or three times, respectively, for administration of the desired
volume (8 ml for calves weighing more than 35 kg but less than or equal to 45 kg and
12 ml for calves weighing more than 45 kg but less than or equal to 60 kg).
For lighter or heavier animals, a precise calculation should be performed (2 ml/10 kg
bw).
7) Continue using until the bottle is empty. If product remains in the bottle, leave the
pump attached until further use.
8) Always replace the cap on the tip of the nozzle after use.

Unlimited Renewal: August 2023
AN: 01398/2023
9) Always replace the bottle in the box.
4 to 12 ml pump
1) Choose the dip tube designed for the height of the bottle (the shorter one for the
490 ml bottle and the longer one for the 980 ml bottle) and insert it into the free hole
located in the base of the pump cap.
2) Remove the cap and the protective seal from the bottle and screw the pump on.

3) Remove the protector cap from the tip of the nozzle of the pump.
4) To prime the pump, turn the dosage ring and select 60 kg (12 ml).
5) Press the trigger gradually with the cannula pointed up, until a drop appears at
the tip of the nozzle.
6) Turn the ring, in order to select the weight of the calf to be treated.
7) Restrain the calf and insert the nozzle of the metering pump into its mouth.
8) Pull the trigger of the metering pump completely for release of the adequate dose.
9) Continue using until the bottle is empty. If product remains in the bottle, leave the
pump attached until further use.
10) Always replace the cap on the tip of the nozzle after use.

Unlimited Renewal: August 2023
AN: 01398/2023
11) Always replace the bottle in the box.
Do not use on an empty stomach.

Unlimited Renewal: August 2023
AN: 01398/2023
Do not use in cases 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.
An increase in the level of diarrhoea has been observed in rare cases, in treated
animals.
The frequency of adverse reactions is defined using the following convention:
- Very common (more than 1 in 10 animals treated displaying adverse reactions)
- Common (more than 1 but less than 10 animals in 100 animals treated)
- Uncommon (more than 1 but less than 10 animals in 1,000 animals treated)
- Rare (more than 1 but less than 10 animals in 10,000 animals treated)
- Very rare (less than 1 animal in 10,000 animals treated, including isolated reports).
None.

Special precautions for use in animals
Administer after colostrum feeding, or after milk or milk replacer feeding only, using
an 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
-
should administer the veterinary medicinal product with caution.
-
-
-
-
If eye irritation persists, seek medical advice.
-
None known.

Unlimited Renewal: August 2023
AN: 01398/2023
Keep the bottle in the outer carton in order to protect from light.
Store upright in the original packaging.
Meat and offal: 13 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.

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