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Fertagyl

This page contains information on Fertagyl for veterinary use.
The information provided typically includes the following:
  • Fertagyl Indications
  • Warnings and cautions for Fertagyl
  • Direction and dosage information for Fertagyl

Fertagyl

This treatment applies to the following species:
Manufacturer: Intervet/Merck Animal Health

(GONADORELIN)

43 mcg/mL gonadorelin Sterile Solution

FOR THE TREATMENT OF CYSTIC OVARIES IN DAIRY CATTLE

FOR USE WITH ESTRUMATE (CLOPROSTENOL INJECTION) TO SYNCHRONIZE ESTROUS CYCLES TO ALLOW FOR FIXED TIME ARTIFICIAL INSEMINATION (FTAI) IN LACTATING DAIRY COWS

ANADA 200-134, Approved by FDA

Fertagyl Caution

Federal law restricts this drug to use by or on the order of a licensed veterinarian.

DESCRIPTION

Fertagyl is a sterile solution containing 43 mcg gonadorelin (GnRH; as gonadorelin acetate) per milliliter suitable for intramuscular or intravenous administration according to the indication.

Gonadorelin is a decapeptide composed of the sequence of amino acids -

5 -oxoPro-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH2

with a molecular weight of 1182.32 and empirical formula C55H75N17O13.

Gonadorelin is the hypothalamic releasing factor responsible for the release of gonadotropins (e.g., LH, FSH) from the anterior pituitary.

Synthetic gonadorelin is physiologically and chemically identical to the endogenous bovine hypothalamic releasing factor.

PHARMACOLOGY AND TOXICOLOGY

Endogenous gonadorelin is synthesized by and/or released from the hypothalamus during various stages of the bovine estrous cycle following appropriate neurogenic stimuli. It passes via the hypophyseal portal vessels, to the anterior pituitary to effect the release of gonadotropins (e.g. LH, FSH).

Synthetic gonadorelin administered intramuscularly or intravenously also causes the release of endogenous LH and FSH from the anterior pituitary.

Gonadorelin acetate has been shown to be safe. The LD50 for mice and rats is greater than 60 mg/kg, and for dogs, greater than 600 mcg/kg, respectively. No untoward effects were noted among rats or dogs administered 120 mcg/kg/day intramuscularly or 72 mcg/kg/day intravenously for 15 days.

It had no adverse effects on heart rate, blood pressure or EKG, when administered to unanesthetized dogs at 60 mcg/kg. In anesthetized dogs it did not produce depression of myocardial or systemic hemodynamics or adversely affect coronary oxygen supply or myocardial oxygen requirements.

The intravenous administration of 60 mcg/kg/day gonadorelin acetate to pregnant rats and rabbits during organogenesis did not cause embryotoxic or teratogenic effects.

The intramuscular administration of 1000 mcg gonadorelin acetate to normally cycling dairy cattle had no effect on hematology or blood chemistry.

Further, gonadorelin acetate did not cause irritation at the site of intramuscular administration in dogs. The dosage administered was 72 mcg/kg/day for 7 days.

Fertagyl Indication And Dosage

Cystic Ovaries

Fertagyl (gonadorelin) is indicated for the treatment of ovarian follicular cysts in dairy cattle. Ovarian cysts are non-ovulated follicles with incomplete luteinization which result in nymphomania or irregular estrus.

Historically, cystic ovaries have responded to an exogenous source of luteinizing hormone (LH) such as human chorionic gonadotropin.

Fertagyl initiates release of endogenous LH to cause ovulation and luteinization.

The recommended intramuscular or intravenous dosage of Fertagyl is 86 mcg gonadorelin (2 mL) per cow.

DO NOT PUNCTURE STOPPER MORE THAN 10 TIMES

Reproductive Synchrony

Fertagyl (gonadorelin) is indicated for use with Estrumate (cloprostenol injection) to synchronize estrous cycles to allow for fixed time artificial insemination (FTAI) in lactating dairy cows.

The recommended intramuscular dosage of Fertagyl is 86 mcg gonadorelin (2 mL) per cow, used in reproductive synchrony programs similar to the following:

● Administer the first Fertagyl injection (2 mL) on Day 0.

● Administer 2 mL of Estrumate (500 mcg cloprostenol, as cloprostenol sodium) by intramuscular injection 6 to 8 days after the first Fertagyl injection.

● Administer the second Fertagyl injection (2 mL) 30 to 72 hours after the Estrumate injection.

● Perform FTAI 8 to 24 hours after the second Fertagyl injection, or inseminate cows on detected estrus using standard herd practices.

Target Animal Safety

In addition to the target animal safety information presented in the section addressing pharmacology and toxicology, target animal safety of, and injection site reactions to, Fertagyl (gonadorelin) when used with Estrumate (cloprostenol injection) were evaluated during the conduct of the effectiveness field studies. The incidence of health abnormalities was not significantly greater in cows administered with Fertagyl than cows administered a placebo injection.

Effectiveness

The effectiveness of Fertagyl (gonadorelin) for use with Estrumate (cloprostenol injection) to synchronize estrous cycles to allow for FTAI in lactating dairy cows was demonstrated in a field study at six different locations in the U.S. A total of 758 healthy, non-pregnant, primiparous or multiparous lactating dairy cows within 50-120 days postpartum were enrolled in the study. A total of 377 cows were administered Fertagyl (2 mL; 86 mcg gonadorelin as the acetate salt) and 381 cows were administered an equivalent volume of saline as an intramuscular injection twice in the following regimen:

Day 0: 2 mL Fertagyl or saline

Day 7: 2 mL Estrumate (cloprostenol injection)

Day 9: 2 mL Fertagyl or saline

Fixed time Al was performed on Day 10, 16 ± 8 hours after the Day 9 injection. Cows were evaluated for pregnancy on 45 ± 5 days by trans-rectal ultrasound or rectal palpation. Pregnancy rate to FTAI was significantly higher (P=0.0051) in cows treated with Fertagyl (33.4%) than the pregnancy rate to FTAI to cows treated with saline (17.8%).

Each mL of Fertagyl contains:

Gonadorelin (as gonadorelin acetate)

43 mcg

Benzyl Alcohol

9 mg

Sodium Chloride

7.47 mg

Water for Injection, USP

q.s.

pH adjusted with sodium phosphate (monobasic and dibasic).

STORAGE CONDITIONS: Keep refrigerated: 2°-8°C (36°-46°F).

USE WITHIN 28 DAYS OF FIRST USE

Precautions

FOR ANIMAL USE ONLY. NOT FOR HUMAN USE. KEEP OUT OF THE REACH OF CHILDREN.

The Material Safety Data Sheet (MSDS) contains more detailed occupational safety information. To report adverse effects in users to obtain a MSDS or for assistance call 1-800-211-3573.

How Supplied

Fertagyl is a sterile solution containing 43 mcg gonadorelin (GnRH; as gonadorelin acetate) per milliliter suitable for intramuscular or intravenous administration according to the indication.

Fertagyl is supplied in multidose vials containing 20 mL and 100 mL of sterile solution.

Manufactured for: INTERVET INC (d/b/a Merck Animal Health), Madison, NJ 07940

By: INTERVET INTERNATIONAL GmbH, Unterschleissheim - Germany

147917 R2, 157370 R1

NAC No.: 1047324.2

MERCK ANIMAL HEALTH
Intervet Inc.

2 GIRALDA FARMS, MADISON, NJ, 07940
Customer Service:   800-521-5767
Order Desk:   800-648-2118
Technical Service (Companion Animal):   800-224-5318
Technical Service (Livestock):   800-211-3573
Fax:   973-937-5557
Website:   www.merck-animal-health-usa.com
Every effort has been made to ensure the accuracy of the Fertagyl information published above. However, it remains the responsibility of the readers to familiarize themselves with the product information contained on the US product label or package insert.

Copyright © 2016 North American Compendiums. Updated: 2016-04-29

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