Synovex Choice

Manufacturer
Zoetis Inc.
Effective date
2025-02-21
Label type
OTC ANIMAL DRUG LABEL
Version
7
Source
full-release
Hydrated at
2026-06-01 02:44:22

Label at a glance#

ProductSynovex Choice
Active ingredientTRENBOLONE ACETATE, ESTRADIOL BENZOATE
Label structure14 sections

Dosage and administration

Administer one SYNOVEX Choice® implant (four pellets), containing 100 mg of trenbolone acetate and 14 mg of estradiol benzoate, to each steer or heifer by subcutaneous implantation in the middle-third of the ear. If using in a reimplantation program, reimplant steers or heifers 60 to 120 days later with a SYNOVEX Choice®, SYNOVEX Plus®, or SYNOVEX® ONE Feedlot implant. Use only a SYNOVEX applicator. Approved impla...

Storage and handling

Store unopened product at controlled room temperature 20°-25°C (68°-77°F) with excursions between 15°-30°C (59°-86°F). Avoid excessive heat and humidity. Use product before the expiration date on the label. Once the pouch is opened, unused product may be stored in the end-folded pouch (away from light) for up to six months under refrigerated conditions 2°-8°C (36°-47°F) or at room temperature 20°-25°C (68°-77°F) w...

Label contents#

Full prescribing information#

SPL UNCLASSIFIED SECTION

SUBCUTANEOUS IMPLANTS FOR GROWING BEEF STEERS AND HEIFERS ON PASTURE, IN A DRY LOT AND FED IN CONFINEMENT FOR SLAUGHTER

SYNOVEX Choice®
(trenbolone acetate and estradiol benzoate implants)

100 mg trenbolone acetate and 14 mg estradiol benzoate per implant

DESCRIPTION SECTION

SYNOVEX Choice® (trenbolone acetate and estradiol benzoate implants) is a growth promoting implant containing 100 mg of trenbolone acetate and 14 mg of estradiol benzoate per implant. Each implant consists of 4 pellets. Ten implants are provided in each cartridge.

NOTE: Administration of a single SYNOVEX Choice® implant or its use in a reimplantation program with a SYNOVEX Choice®, SYNOVEX Plus®, or SYNOVEX® ONE Feedlot implant may result in decreased marbling scores when compared to non-implanted steers and heifers.

WITHDRAWAL PERIODS AND RESIDUE WARNINGS

WARNINGS SECTION

No withdrawal period is required when used according to labeling.

Do not use in beef calves less than 2 months of age, dairy calves, and veal calves. A withdrawal period has not been established for this product in pre-ruminating calves.

Do not use in dairy cows or in animals intended for subsequent breeding. Use in these cattle may cause drug residues in milk and/or in calves born to these cows.

Implant pellets subcutaneously in ear only. Any other location is a violation of Federal law. Do not attempt salvage of implanted site for human or animal food.

USER SAFETY WARNINGS

USER SAFETY WARNINGS SECTION

Not for use in humans. Keep out of reach of children.

ANIMAL SAFETY WARNINGS

WARNINGS SECTION

Bulling has occasionally been reported in implanted steers and heifers. Vaginal and rectal prolapse, udder development, ventral edema and elevated tailheads have occasionally been reported in heifers administered SYNOVEX Choice® implants.

DIRECTIONS

DOSAGE & ADMINISTRATION SECTION

Administer one SYNOVEX Choice® implant (four pellets), containing 100 mg of trenbolone acetate and 14 mg of estradiol benzoate, to each steer or heifer by subcutaneous implantation in the middle-third of the ear. If using in a reimplantation program, reimplant steers or heifers 60 to 120 days later with a SYNOVEX Choice®, SYNOVEX Plus®, or SYNOVEX® ONE Feedlot implant.

Use only a SYNOVEX applicator. Approved implantation technique is fully described in the fold-out carton section. Never sacrifice careful, clean technique for speed of implantation.

STORAGE

STORAGE AND HANDLING SECTION

Store unopened product at controlled room temperature 20°-25°C (68°-77°F) with excursions between 15°-30°C (59°-86°F). Avoid excessive heat and humidity. Use product before the expiration date on the label.

Once the pouch is opened, unused product may be stored in the end-folded pouch (away from light) for up to six months under refrigerated conditions 2°-8°C (36°-47°F) or at room temperature 20°-25°C (68°-77°F) with excursions between 15°-30°C (59°-86°F) for up to one month.

DISPOSAL

ENVIRONMENTAL WARNING SECTION

SYNOVEX Choice® waste materials should be disposed of according to prescribed Federal, State, and Local guidelines.

INDICATIONS FOR USE

VETERINARY INDICATIONS SECTION

  • For increased rate of weight gain in growing beef steers and heifers on pasture (stocker, feeder, and slaughter).
  • For increased rate of weight gain in growing beef steers and heifers in a dry lot.
  • For increased rate of weight gain in growing beef steers fed in confinement for slaughter and for increased rate of weight gain and improved feed efficiency in growing beef heifers fed in confinement for slaughter.
  • For increased rate of weight gain for up to 200 days in growing beef steers and heifers fed in confinement for slaughter in a reimplantation program where SYNOVEX Choice® is the first implant and a SYNOVEX Choice®, SYNOVEX Plus®, or SYNOVEX® ONE Feedlot implant is administered 60 to 120 days later.
  • Other than as described on the labeling, this implant is not approved for repeated implantation (reimplantation) with any other cattle ear implant in growing beef steers and heifers fed in confinement for slaughter, on pasture, or in a dry lot as safety and effectiveness have not been evaluated.

Do not use in beef calves less than 2 months of age, dairy calves, and veal calves because effectiveness and safety have not been established.

Do not use in animals intended for subsequent breeding, or in dairy cows.

QUESTIONS/COMMENTS?

SPL UNCLASSIFIED SECTION

For a copy of the Safety Data Sheet or to report side effects, contact Zoetis Inc. at 1-888-963-8471. For additional information about reporting side effects for animal drugs, contact FDA at 1-888-FDA-VETS or www.fda.gov/reportanimalae.

SPL UNCLASSIFIED SECTION

SYNOVEX Plus® (trenbolone acetate and estradiol benzoate implants) and SYNOVEX® ONE Feedlot (trenbolone acetate and estradiol extended-release implants) are owned by Zoetis.
Manufactured By A Non-Sterilizing Process

Restricted Drug (California)—Use Only As Directed.

IMPORTANT

SPL UNCLASSIFIED SECTION

Read ALL sides of carton

SPL UNCLASSIFIED SECTION

NET CONTENTS: 10 CARTRIDGES
Each Cartridge Contains 10 implants (100 implants total)

Approved by FDA under NADA # 141-043

zoetis

Distributed by:
Zoetis Inc.
Kalamazoo, MI 49007

40049036

PRINCIPAL DISPLAY PANEL - 10 Cartridge Implant Carton

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL

Steps
Steps
applicators
applicators

40049036

DailyMed RxNorm Mappings#

RxCUI, RxNorm string, TTY table
RxCUIRxNorm stringTTYSPL version
1594951SYNOVEX Choice 100 MG / 14 MG Drug ImplantPSN7
1594946trenbolone acetate 100 MG / estradiol benzoate 14 MG Drug ImplantPSN7
1594951estradiol 3-benzoate 14 MG / trenbolone acetate 100 MG Drug Implant [Synovex]SBD7
1594946estradiol 3-benzoate 14 MG / trenbolone acetate 100 MG Drug ImplantSCD7
1594946estradiol benzoate 14 MG / trenbolone acetate 100 MG Drug ImplantSY7
1594951Synovex Choice (estradiol benzoate 14 MG / trenbolone acetate 100 MG) Drug ImplantSY7

DailyMed Product Concepts#

Product concept, Relation, Version table
Product conceptRelationVersionEffective
5bec24fd-caeb-8b32-1ff0-ca0dd1751379Product name220250618
3fcaf367-cbc2-4d1e-845e-e1ce4b0d86a6Product name220250616
4ca088c7-0c0e-114d-ffaa-d1b94f9eadc1Product name620250311
99d68ea7-fba4-0d7b-b5fa-468e21dd1cbfProduct name220250204
a1c50ef5-9c2c-d846-1ca1-70fabf2428e1Product name320240507
66263a7f-f64d-41c4-90f1-2cee106617ccProduct name120240501
76820076-f087-4073-b1d1-aa04b361335eProduct name220220921
132e7bcf-ca42-94e4-3c78-c44ae7819a94Product name320220126
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001f367b-fa14-49a0-865b-b395f2553601Product name220190611
3f090665-4687-4bb4-8790-8efb1930ee74Product name120180801
7a549f52-8b99-472c-8b1d-3a70c53c9bf4Product name120160623
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5f44c957-835a-ada0-662f-5b1071b7a68bProduct name120140508
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d6b36b6b-65d6-a810-0fa7-61ddf1a96352Product name120140508

DailyMed Package Descriptions#

Package NDC, Product, Description table
Package NDCProductDescriptionFormQuantityStrengthSPL version
54771-3908-1Synovex Choice1 in 1 BOXIMPLANT17
54771-3908-1Synovex Choice10 in 1 POUCHIMPLANT107

DailyMed Dashboard NDC Coverage#

NDC, Dashboard title, SPL version table
NDCDashboard titleSPL versionValidationDashboard ZIP
54771-3908SYNOVEX CHOICE (TRENBOLONE ACETATE AND ESTRADIOL BENZOATE) IMPLANT [ZOETIS INC.]72 package rows20250224_721167af-d5a2-4a5e-afca-6b17465256ed.zip

DailyMed Socrata Ingredients#

Ingredient, Type, UNII table
IngredientTypeUNIISPL versionUploaded
estradiol benzoateACTIVE INGREDIENT1S4CJB5ZGN1
trenbolone acetateACTIVE INGREDIENTRUD5Y4SV0S1
estradiolACTIVE MOIETY4TI98Z838E1
trenboloneACTIVE MOIETYP53R4420TR1

Products#

Every source-derived product name is available through these pages.

DailyMed product names page 1 of 1 · 6 matching rows.

NDC Codes#

Product NDC, Package NDC table
Product NDCPackage NDC
54771-390854771-3908-1

Ingredients#

Every source-derived ingredient row is available through these pages.

DailyMed ingredient rows page 1 of 1 · 2 matching rows.

Name, UNII, Kind table
NameUNIIKind
TRENBOLONE ACETATERUD5Y4SV0SACTIB
ESTRADIOL BENZOATE1S4CJB5ZGNACTIB

Source Document#

Source XML · Source PDF

Reported adverse events (FAERS/openFDA)#

Adverse event summaries are temporarily unavailable. Other product information remains available.