Penicillin - Long Acting

Long-acting penicillin is a suspension containing 150,000 units penicillin G benzathine and 150,000 units penicillin G procaine in each ml.   30-day withdrawal period before slaughter. Private label brands may vary!  

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Availability: All sizes on manufacturer back order

No Sale to California


Dosage: 2 ml injected SQ for each 150 pounds of body weight in cattle. Repeat 48 hours later.

For subcutaneous use only!!!!!! For use in beef cattle only!!!!! Do not use in calves processed for veal!! 

This product is indicated for the treatment of the  following bacterial infections in beef cattle due to penicillin-susceptible microorganisms that are susceptible to the serum levels common to this particular dosage form, Bacterial pneumonia(shipping  fever complex), Upper respiratory infections such as rhinitis or pharyngitis , and Blackleg.


Exceeding the recommended doses and dosage levels may result in antibiotic residues beyond the withdrawal time. Do not inject this product intramuscularly.

Penicillin G is a substance of low toxicity. However, side effects, or so-called allergic or anaphylactic reactions - sometimes fatal, have been known to occur in animals hypersensitive to penicillin and procaine. Such reactions can occur unpredictably with varying intensity. Animals administered penicillin G should be kept under close observation for at least one-half hour. Should allergic or anaphylactic reactions occur, discontinue use of the product and immediately administer epinephrine following manufacturer’s recommendations and call a veterinarian.

As with all antibiotic preparations, use of this drug may result in overgrowth of non-susceptible organisms, including fungi. A lack of response by the treated animal, or the development of new signs or symptoms suggests that an overgrowth of non-susceptible organisms has occurred. In such instances, consult your veterinarian.

Since bactericidal drugs may interfere with the bacteriostatic action of tetracyclines, it is advisable to avoid giving penicillin in conjunction with tetracyclines.

Residue Warning:

 Beef cattle should be withheld from slaughter for food use for 30 days following the last treatment. Treatment in beef cattle must be limited to two (2) doses, by subcutaneous injection only. Do not inject intramuscularly.

A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal

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