Oral solution for the treatment of Cryptosporidium (crypto) in calves. 

Why Halocur®

Halocur is a registered veterinary medicine (RVM) that can treat scours caused by Cryptosporidium parvum and be given to other calves in the pen to help prevent the spread of Cryptosporidiosis. Calf scours caused by Cryptosporidium parvum is highly contagious spreading to all calves in the pen and is easily spread to humans.

Talk to your veterinarian about Halocur – A product that does more than just treat.

Controlling crypto with Halocur

  1. Diagnosis 

Call your vet to investigate the calf scours. Cryptosporidiosis can be diagnosed using clinical signs, examination of faecal samples, and/or necropsy. 

  1. Therapy 

To ensure rapid control of clinical signs, all calves aged less than 3 weeks with diagnosed cryptosporidiosis should be treated once daily with 2 mL per 10 kg of bodyweight of Halocur within 24 hours of onset of diarrhoea for seven days, in addition to symptomatic therapies. 

  1. Prevention 

Treat all newborn calves with Halocur within 24-48 hours of birth. Once daily, for 7 consecutive days administer 2 mL per 10 kg of bodyweight, orally. 

  1. Improve management practices 

Improve hygiene around calving, paying attention to both the cow and the environment. •Review the housing of newborn calves; consider ‘all in, all out’ systems and prevent other causes of neonatal calf diarrhoea. 

Produce antibody-rich colostrum by vaccinating cows with Rotavec® Corona and ensure calves have adequate colostrum intake immediately after birth, and as part of their diet for a minimum of 3 weeks.

Using Halocur® to treat and prevent 

For the prevention of diarrhoea caused by Cryptosporidium parvum, treatment should be commenced within 24-48 hours post-birth. 

For the treatment of diarrhoea caused by Cryptosporidium parvum, treatment should be commenced within 24 hours after onset of diarrhoea. 

Dose and administration 

For oral use in calves, directly after feeding:

2 mL per 10 kg bodyweight, once daily for 7 consecutive days. 


Overdosing may cause adverse effects. 

Follow label instructions for application and dosage and for additional information about the product and its use. 


Do not administer to calves with an empty stomach. 

Do not administer to weakened calves or to calves that have been ill for more than 24 hours. 

Not for use in bobby calves. 

AVAILABLE ONLY UNDER VETERINARY AUTHORISATION. ACVM No. A9802. Schering-Plough Animal Health Ltd. Ph: 0800 800 543. www.msd-animal-health.co.nz Copyright © 2022 Merck & Co., Inc., Rahway, NJ, USA and its affiliates. All rights reserved. NZ-HAC-220600001