Duocillin LA

Veterinary drug DUOCILLIN LA

The drug is used for the treatment of bacterial infections

  • Effective against diseases of various organs and tissues

  • Becomes active in 1-2 hours after injection

  • Long therapeutic action (3 days)

  • Short withdrawal period for milk (3 days)

Therapeutic indications:

Duocillin LA is used in cattle, pigs, sheep and goats for the treatment of arthritis, mastitis, gastrointestinal, respiratory and urogenital infections caused by microorganisms which are sensitive to benzylpenicillin.

Composition of the veterinary drug:

1 ml of the drug contains:

  • 150,000 IU of procaine benzylpenicillin,
  • 150,000 IU of benzylpenicillin benzathine.

Pharmacological activity:

Duocillin LA is a complex long-acting antibacterial drug.

The active substance of the drug contains: benzilpenicillin procaine and benzilpenicillin benzatine – antibiotics of β-lactam group, which has bactericidal activity against gram-positive and gram-negative bacteria, such as Clostridium spp., Corynebacterium spp., Erysipelothrix rhusiopathiae (insidiosa), Listeria monocytogenes, Streptococcus spp. Also these antibiotics have a bacteriostatic effect on Staphylococcus spp., Leptospira spp., Treponema spp. and so on, which do not produce penicillinase.

The mechanism of action of the drug: procaine benzylpenicillin and benzathine benzylpenicillin inhibit the synthesis of the component of mucopeptide (acetylmuramic acid), required for building the bacterial cell wall. As a result, bacterial cells stop growing that leads to further bacterial lysis.

After intramuscular administration of the drug, a therapeutic concentration of active substances in the blood is reached in 1 - 2 hours, and due to slow resorption its therapeutic effect is maintained for 3 days.

Penicillins are excreted from the body in unchanged form mainly with urine.


The drug is given intramuscularly in one single dose:

  • Cattle - dose of 1 ml of the drug per 25 kg of body weight, but not more than 20 ml in one injection site.
  • Pigs - dose of 1 ml of the drug per 20 kg of body weight, not more than 10 ml in one injection site.
  • Calves, piglets, sheep, goats - dose of 1 ml of the drug per 10 kg of body weight, not more than 5 ml in one injection site.

If necessary, the injection of the same dose is repeated in 72 hours.

Before use, the flask containing the drug should be shaken thoroughly.

Precautions and adverse reactions:

When using the drug, side effects such as premature parturition in sows, ototoxicity, neurotoxicity, nephrotoxicity and allergic reactions may be observed.

If symptoms of an allergic reaction occur, the drug should be cancelled; antihistamines and calcium should be prescribed.

No overdose symptoms when using the drug have been observed.

Do not use in animals with hypersensitivity to penicillins and/or cephalosporins, as well as in animals with disorders of renal excretory function.

Do not use the drug simultaneously with macrolide, tetracycline, polymyxin and lincosamide antibiotics.

Follow the rules of personal hygiene and safety while handling the drug.

Avoid direct contact with the drug in case of hypersensitivity to its components.

Withdrawal period:

Animals must not be slaughtered for human consumption before 14 days after the last drug administration.

The withdrawal period for meat for human consumption at injection sites:

  • for cattle and pigs - 70 days,
  • for sheep - 56 days.

Meat of animals forcibly slaughtered before the specified period expires may be used for feeding carnivores.

It is forbidden to use milk for human consumption during the treatment period and within 3 days after the last drug administration.  Milk obtained before the expiry of the established period is allowed for animal feeding after thermal treatment.

Storage conditions:

Store in a dark place at a temperature between +2 °C to +15 °C. After the first opening of the vial, the drug is stored at a temperature between +2 °C to +8 °C.

The drug should be kept out of reach of children.


Shelf-life of the veterinary drug is 2 years from the date of manufacture. Shelf-life after first opening of the bottle is 14 days under appropriate storage conditions. Do not use the drug after the expiry date. Unused veterinary drug should be utilized in accordance with the requirements of the law.

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