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Synovex C Calf Implants, 10 x 10 Cartridges
Price: $155.73
Item #: 1017720 -
Availability: In Stock
Synovex H Implant, 10 x 10 (100) Doses
Price: $155.91
Item #: 1016520 -
Availability: In Stock
Synovex S Steer Implants, 10 x 10 Cartridges
Price: $155.73
Item #: 1017651 -
Availability: In Stock

Products 1-3 of 3

Steroid Hormone Implants for Cattle

Synovex is an implantable hormone cartridge for steer, calves, and heifers. Synovex-C for calves contains progesterone and estradiol for maximum growth. Synovex-H contains testosterone propionate and estradiol benzoate for maximal growth stimulation. Synovex-S for steer contains 200 mg of progesterone and 20 mg of estradiol per dosage.

Synovex implants administer two steroids to increase weight gain and improve feed efficiency in steers, calves, and heifers. The implants are generally well tolerated and not associated with severe side effects when used properly in otherwise healthy animals.

Benefits of Synovex:

  • Increases daily weight gain
  • Improves weaning weights
  • Does not usually cause serious side effects
  • Zero day slaughter withholding
  • Easy to use when directions are followed

Use Synovex only as directed by your veterinarian.

For subcutaneous ear implantation only.

Read all directions and package inserts before implanting.


  1. Wash your hands with soap and water before implantation. Use only sterilized instruments.
  2. Read and follow approved implantation technique described in the package insert.
  3. Restrain animals using appropriate restraint mechanism.
  4. Sterilize the site intended for implantation.
  5. Implant the complete contents of one cartridge cell into each animal.
  6. Administer implant to the ear only. Administering elsewhere is a violation of federal law.

Frequency of Use:

Re-implant Synovex S at 70 days.


Store Synovex at controlled room temperature, between 59 and 86 degrees F., and away from excessive humidity and heat. Keep out of reach of children.

It is a violation of Federal Law to use this product in a manner inconsistent with its labeling.

Synovex S Active Ingredients (per dose): Progesterone 200 mg, Estradiol 20 mg

Synovex C Active Ingredients (per dose): Progesterone 100 mg, Estradiol 10 mg

Synovex H Active Ingredients (per dose): Testosterone 200 mg, Estradiol 20 mg


Keep Synovex out of reach of children and animals. Do not use or store in or near open flame or heat.

Synovex S is for use in steers only. Not for use in veal calves or other animals.  Not for humans. Synovex C is for use in calves only. Not for use in bull calves intended for reproduction, in veal calves, or in calves less than 45 days old. Synovex H is for use in heifers only. Not for use in veal calves, dairy or beef replacement heifers, or humans.

CAUTION: A withdrawal period has not been established for Synovex C in pre-ruminating calves.

Synovex S may cause rectal prolapse, bulling, elevated tailheads, and ventral edema.

Synovex C may cause vaginal and rectal prolapse, ventral edema, udder development, and elevated tailheads.

Synovex H may cause udder development, rectal and vaginal prolapse, ventral edema, and elevated tailheads.

Do not use Synovex in animals with a known allergy to it or to similar medications.

Warranty and Manufacturer Information:

Fort Dodge Animal Health

Synovex S:

NDC 0856-3902-40 - 10 cartridges (100 Dose)

NADA 9-576, Approved by FDA

Each Cartridge Contains 10 Rows of 8 Pellets

Synovex C:

NADA 9-576, Approved by FDA

NDC 0856-3903-02 - 2 cartridges (20 Dose)

NDC 0856-3903-43 - 10 cartridges (100 Dose)

Each Cartridge Contains 10 Rows of 4 Pellets.

Synovex H:

NDC 0856-3901-40 - 10 cartridges (100 Dose)

Each Cartridge Contains 10 Rows of 8 Pellets.

2004 Fort Dodge Animal Health. All Rights Reserved.

Fort Dodge Animal Health, Fort Dodge, Iowa 50501 USA



NAC No.: 10032152