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Penicillin G Procaine (PEN) - Medicating Ingredient Brochure

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Status: Veterinary prescription required for approved claims

Revised January 2022

Table of approved species and claims
Approved livestock species Approved claim(s)
(abbreviated)Table note 1
Withdrawal time Name of approved brand(s)
Broiler chickens
  1. Aid in the treatment of necrotic enteritis
2 days (meat) Penicillin G Procaine 110

Broiler chickens

Table of approved claims and brands
Approved claims Name of approved brand(s) Drug concentration in DIN product
Claim 1 Penicillin G Procaine 110 Penicillin G Procaine USP at 110 g/kg

Claim 1

As an aid in the treatment of necrotic enteritis caused by Clostridium perfringens in broiler chickens.

Level of medicating ingredient in a complete feed

55 mg/kg (0.0055%) of penicillin G procaine in the complete feed.

Directions for use in a complete feed

This livestock feed contains a medically important antibiotic. To reduce the development of antimicrobial resistance and maintain effectiveness, use this antibiotic prudently.

Feed this medicated feed as the sole ration for 5 days after detection of the disease.

Additional information (not to appear on feed labels)

For feed manufacturers
Add and mix thoroughly into the ration at the following rate to provide 55 mg/kg (0.0055%) penicillin G procaine per metric tonne (1000 kg) of finished (complete) feed:


  1. Treated chickens must not be slaughtered for use in food for at least 2 days after the latest treatment with this medicated feed when fed at the recommended level of 55 mg/kg (0.0055%) penicillin G procaine in the complete feed.
  2. Do not feed to laying hens.
  3. This medicated feed can cause allergic reactions in sensitized individuals. Persons with known hypersensitivity to penicillins should avoid exposure to this product.
  4. When handling the product, avoid inhalation, oral exposure and direct contact with skin or eyes. Wash hands after handling. (Required on premix and supplement labels only)
  5. Keep out of reach of children. (Required on premix and supplement labels only)


  1. This medicated feed should only be used in the treatment of Clostridium perfringens infections following diagnosis by a veterinarian or poultry pathologist.
  2. If no improvement is seen during the treatment period, the diagnosis should be re-evaluated.

Accepted Compatibilities

Penicillin G procaine is compatible with the following drug/drug combinations. In cases where there are differences in withdrawal time for the compatible medicating ingredients, the longer withdrawal time is the one that must be used, and is the only one that is to appear on the label of the finished feed. For details, refer to the MIB as indicated.

Penicillin G procaine (broiler chickens)
Name of medicating ingredient MIB code Name of approved brand(s) Applicable claims
Amprolium AMP
  1. Amprol Feed Premix
  2. Amprolium 250
All claims
Clopidol CLO Coyden 25 Anticoccidial Premix All claims
Piperazine dihydrochloride PID Piperazine 52 All claims (chickens)
Zoalene ZOAF Zoamix Medicated Premix All claims
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