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Polymast (144x10 mL Pail)

Item# MWI062935
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Recurring Saings in EprxAUTOSHIP & SAVE[Details]
Recurring Saings in EprxAUTOSHIP & SAVE[Details]
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PolyMast an antibiotic mastitis treatment providing bactericidal activity against Gram-positive and Gram-negative bacteria. Provides control against the major mastitis causing pathogens - Streptococcus agalactiae, Streptococcus dysgalactiae, Staphylococcus aureus and Escherichia coli. Potent bactericidal action that does not rely on the cow's immune system to kill bacteria.

Key Benefits

  • Milk withhold just 72 hours after last treatment
  • PolyMast reduces antibiotic use when you switch from extended therapy
  • Effective against a wide range of common bacteria
  • Convenient once-per-day dosing
  • Federal law restricts this drug to use by or on the order of a licensed veterinarian.


For the treatment of acute, chronic or subclinical bovine mastitis. PolyMast for intramammary infusion should be used at the first signs of inflammation or at the first indication of any alteration in the milk. Subclinical infections should be treated immediately upon determining, by C.M.T. or other tests, that the leukocyte count is elevated, or that a susceptible pathogen has been cultured from the milk.

PolyMast for intramammary infusion has been shown to be efficacious in the treatment of mastitis in lactating cows caused by susceptible strains of Streptococcus agalactiae, Streptococcus dysgalactiae, Staphylococcus aureus and Escherichia coli.

Polycillin (ampicillin) Susceptibility Test Discs, 10 mcg, should be used to estimate the in vitro susceptibility of bacteria to hetacillin.


View PolyMast Drug Facts Sheet.

Infuse the entire contents of one syringe (10 mL) into each infected quarter. Repeat at 24-hour intervals until a maximum of three treatments has been given.

If definite improvement is not noted within 48 hours after treatment, the causal organism should be further investigated.

Wash the udder and teats thoroughly with warm water containing a suitable dairy antiseptic and dry, preferably using individual paper towels. Carefully scrub the teat end and orifice with 70% alcohol, using a separate swab for each teat. Allow to dry.

PolyMast is packaged with the Opti-Sert protective cap

For Partial Insertion: Twist off upper portion of the OPTI-SERT protective cap to expose 3-4 mm of the syringe tip.

For Full Insertion: Remove protective cap to expose the full length of the syringe tip.

Insert syringe tip into the teat canal and expel the entire contents of one syringe into each infected quarter. Withdraw the syringe and gently massage the quarterto distribute the medication.

Do not infuse contents of the mastitis syringe into the teat canal if the OPTI-SERT protective cap is broken or damaged.

Residue Warnings:

  1. Milk that has been taken from animals during treatment and for 72 hours (6 milkings) after the latest treatment must not be used for food.
  2. reated animals must not be slaughtered for food until 10 days after the latest treatment.


Federal law restricts this drug to use by or on the order of a licensed veterinarian.


Because it is a derivative of 6-aminopenicillanic acid, PolyMast has the potential for producing allergic reactions. Such reactions are rare; however, should they occur, treatment should be discontinued and the subject treated with antihistamines, pressor amines, such as epinephrine or corticosteroids. The drug does not resist destruction by penicillinase and, hence, is not effective against strains of staphylococcus resistant to penicillin G.

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