Amphoprim® Bolus

Antibiotic bolus containing Trimethoprim, used to treat bacterial infections in cattle, sheep, pigs and horses

  • Cattle
  • Horse
  • Goat
  • Sheep
  • AMR Class Orange
    AMR Class Orange
  • Antibiotic

Amphoprim® Bolus is an antibiotic bolus containing Trimethoprim and Sulphamethoxypyridazine. It is used to treat infections of the respiratory tract, digestive tract, urogenital tract, and other local/generalised infections.

  • Once-a-day administration.
  • Broad-spectrum.
  • Oral or intrauterine administration.


  • Cattle, calves, horses, foals, sheep and goats: one bolus per 50 kg bodyweight for 3-5 days.
  • When administering orally, give whole or dissolved in water. When administering intrauterine for metritis, place one whole bolus into the uterus - repeat in 24 - 48 hours if required. Ensure adequate drinking water is available during treatment.


It is an offence for users of this product to cause residues exceeding the relevant MRL in the Food Notice: Maximum Residue Levels for Agricultural Compounds.

  • Milk (cattle): 48 hours / 4 milkings
  • Milk (sheep and goats): 35 days
  • Meat (cattle, sheep and goats): 5 days
  • Meat (horses): 63 days


Available in packs of 20 boluses.


This product is classified as orange under Antibiotic Judicious Use Guidelines for the New Zealand Veterinary Profession. Orange light antimicrobials are restricted to specifi­c indications or used as second line therapy under therapeutic conditions. Visit and talk to your Vet to learn more. Please use antibiotics responsibly.

To learn more about Amphoprim® Bolus, download the Product Profile below and talk to your Vet.

Download SDS

Download Product Profile


Amphoprim® Bolus is a Restricted Veterinary Medicine. Available only under Veterinary Authorisation. Registered pursuant to the ACVM Act 1997, No. A4807.

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