Mastitis Treatments

Penclox® 1200

Intramammary containing penicillin and cloxacillin, used to treat Strep. uberis and Staph. aureus mastitis in dairy cows

  • Cattle
  • AMR Class Orange
    AMR Class Orange
  • NZ Made
    NZ Made
  • Antibiotic

Penclox® 1200 is an intramammary mastitis treatment for lactating dairy cows that contains both procaine penicillin and cloxacillin. This unique combination of antibiotics makes the product ideal to treat the two most common mastitis pathogens in NZ - Strep. uberis & Staph. aureus, meaning one product can conveniently be used throughout the entire lactation.

  • The #1 selling lactating cow intramammary in NZ
  • Registered milk and meat WHPs for 3, 4, 5 or 6 treatments at 24-hour intervals, OAD and TAD milking
  • Developed, trialled and made in New Zealand


The entire contents of one syringe should be infused into the teat canal of each infected quarter immediately following milking. Repeat the treatment twice more at 24 hour intervals - three syringes provide a full course of treatment. If required, an extended treatment of 4, 5, or 6 syringes at 24 hour intervals may be given.


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 (twice-a-day): 108 hours / 9 milkings
  • Milk (once-a-day): 120 hours / 5 milkings
  • Meat: 10 days


Available in boxes of 24 syringes.


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 Penclox® 1200, download the Product Profile below and talk to your Vet. To learn more about mastitis, visit the mastitis page in our Health Care section.

Download SDS

Download Product Profile


Penclox® 1200 is a Restricted Veterinary Medicine. Available only under Veterinary Authorisation. Registered pursuant to the ACVM Act 1997, No. A10884.

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