Pennchlor S

(chlortetracycline, sulfamethazine)
Type A Medicated Article

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  • Antibacterial combination premix for oral administration in feed to beef cattle
  • Each pound of premix contains 35 Grams of chlortetracycline activity and 35 Grams (7.7%) of sulfamethazine.
  • Free-flowing meal feed medication.
  • Ingredients: Chlortetracycline calcium complex, sulfamethazine, calcium sulfate, dried Streptomyces aureofaciens fermentation product, mineral oil.
  • 50-lb, fuchsia color-coded bags.
  • Combination of two potent antibacterial agents (chlortetracycline and sulfamethazine), providing broad-spectrum activity for cattle weight gain and cattle shipping fever treatment
  • Readily absorbed, providing effective blood and lung tissue concentrations
  • Excellent feed medication in starter diets for beef cattle. Perfect for well-managed receiving and weaning programs.
  • Carriers and ingredients enhance pellet quality when used in easy-to-feed beef crumbles
  • Free-flowing formulation promotes consistent mixing
  • Wide safety margin
  • Color-coded bag for easy identification
  • High-quality manufacturing at US Pharmgate facilities

For Use in the Manufacture of Beef Cattle Feeds: As an aid in the maintenance of weight gains in the presence of respiratory disease such as shipping fever.

Use Levels of Chlortetracycline

Mix sufficient Pennchlor•S® in the feed to supply 350 mg of Chlortetracycline and 350 mg of Sulfamethazine per head per day. The following table shows the amounts of Pennchlor•S® needed for the various quantities of supplement.

Pennchlor S lb/Ton Supplement

Supplement will contain Chlortetracycline g/ton

Supplement will contain Sulfamethazine g/ton

Feed Supplement at lb/Head/Day

40 1400 1400 0.5
20 700 700 1
10 350 350 2
5 175 175 4
4 140 140 5
2 70 70 10
1 35 35 20

WARNING: WITHDRAW 7 DAYS PRIOR TO SLAUGHTER. A WITHDRAWAL PERIOD HAS NOT BEEN ESTABLISHED FOR THIS PRODUCT IN PRE-RUMINATING CALVES. DO NOT USE IN CALVES TO BE PROCESSED FOR VEAL


  • 7 days.
  • A withdrawal period has not been established for this product in pre-ruminating calves.
  • 50-lb, fuchsia color-coded bags.
  • Free-flowing meal feed medication.
  • Ingredients: Chlortetracycline calcium complex, sulfamethazine, calcium sulfate, dried Streptomyces aureofaciens fermentation product, mineral oil.
  • CAUTION: Federal law restricts medicated feed containing this veterinary feed directive (VFD) drug to use by or on the order of a licensed veterinarian.
  • Type A Medicated Article for use in the manufacture of beef cattle feeds.
  • Category II drug; requires a feedmill license (not required for Type B and Type C medicated feeds).
  • Store at, or below 25ºC (77ºF), excursions permitted to 37ºC (99ºF).
Pennchlor S: Two potent antibacterial agents (chlortetracycline and sulfamethazine) providing broad-spectrum activity for cattle weight gain and cattle shipping fever treatment.
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Available in the USA

The labeling contains complete use information, including any cautions and warnings. Always read, understand and follow the labeling and use directions. See the reverse side for use directions and additional information.