Acegon 50 Micrograms/Ml Solution For Injection For Cattle

Revised: July 2016

AN: 00655/2015



ACEGON 50 micrograms/ml solution for injection for cattle.

In Portugal: GONESTIN 50 micrograms/ml solution for injection for cattle.

In Norway and Denmark: ACEGON Vet 50 micrograms/ml solution for injection for cattle.

In Italy: RELOSYL 50 micrograms/ml solution for injection for cattle


Each ml contains:

Active substance:

Gonadorelin (as gonadorelin acetate) 50 µg


Benzyl alcohol (E1519) 9 mg

For the full list of excipients, see section 6.1.


Solution for injection.

Clear, colourless or almost colourless solution free from visible particles.


4.1 Target species

Cattle: cows, heifers.

4.2 Indications for use, specifying the target species

Cattle: cows and heifers.

Treatment of ovarian follicular cysts.

In association with artificial insemination to optimise the time of ovulation.

Induction and synchronisation of oestrus and ovulation in combination with prostaglandin F2(PGF) with or without progesterone as part of Fixed Time Artificial Insemination (FTAI) protocols:

-In cycling cows. To be used in combination with PGFor analogue.

-In cycling and non-cycling cows and heifers. To be used in combination with PGFor analogue and progesterone releasing device.

4.3 Contraindications

Do not use in animals with known hypersensitivity to gonadorelin and to any excipient.

Do not use for shortening of oestrus during infectious diseases and other relevant disorders.

4.4 Special warnings for each target species

In the treatment of cystic ovaries, the condition of ovarian follicular cysts should be diagnosed by rectal palpation revealing the presence of persisting follicular structures with a diameter over 2.5 cm and should be confirmed by the use of plasma or milk progesterone assay.

The product should be administered at least 14 days after calving due to the absence of receptivity of the hypophysis before that time.

For induction and synchronisation of oestrus and ovulation in Fixed Time Artificial Insemination (FTAI) protocols, the product should be administered at least 35 days after calving. The response of cows and heifers to synchronisation protocols is influenced by the physiological state at the time of treatment. Responses to treatment can vary either across herds or across cows within herds. However, the percentage of cows displaying oestrus within a given period is usually greater than in untreated cows and the subsequent luteal phase is of normal duration.

For protocol that only includes PGF2recommended for cycling cows: To maximiseconception rates of cows to be treated, the ovarian status should be determined and regular cyclic ovarian activity confirmed. Optimal results will be achieved in healthy normally-cycling cows.

4.5 Special precautions for use

Special precautions for use in animals

Animals in poor condition, whether from illness, inadequate nutrition, or other factors, may respond poorly to treatment.

Special precautions to be taken by the person administering the veterinary medicinal product to animals

Care should be taken when handling the product to avoid self-injection. In case of accidental self-injection, seek medical advice immediately and show the package leaflet or the label to the physician.

Care should be taken to avoid skin and eye contact. In case of skin contact, rinse immediately and thoroughly with water as GnRH analogues can be absorbed through the skin. In case of accidental contact with eyes, rinse thoroughly with plenty of water.

The effects of accidental exposure in pregnant women or in women with normal reproductive cycles are unknown; therefore it is recommended that pregnant women should not administer the product, and that women of child-bearing age should administer the product with caution.

People with known hypersensitivity to GnRH analogues, should avoid contact with the veterinary medicinal product.

4.6 Adverse reactions (frequency and seriousness)


4.7 Use during pregnancy, lactation or lay


Not applicable


Can be used during lactation

4.8 Interaction with other medicinal products and other forms of interaction

A synergistic effect occurs in case of combined administration of FSH.

4.9 Amounts to be administered and administration route

Intramuscular use.

Treatment of ovarian follicular cysts: 100-150 micrograms of gonadorelin (as acetate) per animal (i.e. 2- 3 ml of the product per animal). If necessary, treatment can be repeated at intervals of 1-2 weeks.

In association with artificial insemination to optimise the time of ovulation, improving the chances that the treated cow will become fertile: 100 micrograms of gonadorelin (as acetate) per animal (i.e. 2 ml of the product per animal). It must be administered at the same time as artificial insemination and/or 12 days after this.

The following timing of injection and insemination should be followed:

Induction and synchronisation of oestrus and ovulation in combination with prostaglandin F2(PGF2α) with or without progesterone as part of Fixed Time Artificial Insemination (FTAI) protocols:

The following FTAI protocols have been commonly reported in the literature:

In cycling cows:


In cycling and non-cycling cows and heifers:

4.10 Overdose (symptoms, emergency procedures, antidotes), if necessary

At up to 5 times the recommended dose and in a regimen extended from one to three daily administrations, no measurable signs of either local or general clinical intolerance were observed.

4.11 Withdrawal period(s)

Meat and offal: zero days.

Milk: zero hours.


Pharmacotherapeutic group: Hypothalamic hormones. Gonadotropin-releasing hormones;ATCvet code: QH01CA01

5.1 Pharmacodynamic properties

Gonadorelin (as acetate) is a synthetic gonadorelin (“Gonadotropin Releasing Hormone” GnRH) physiologically and chemically identical to the natural gonadorelin released by the hypothalamus in mammalian species.

Gonadorelin stimulates the synthesis and release of the pituitary gonadotropins, luteinizing hormone (LH) and follicle stimulating hormone (FSH). Its action is mediated by a specific plasma membrane receptor. Only 20% GnRH receptor occupancy is required to induce 80% of the maximum biological response. The binding of GnRH to its receptor activates protein kinase C (PKC) and also mitogen-activated protein kinase (MAPK) cascades which provide an important link for the transmission of signals from the cell surface to the nucleus allowing synthesis of the gonadotropin hormones.

Repeat breeding may be affected by multiple factors, including feeding and husbandry practices. Also, one of the most prominent findings in repeat breeding animals is the delayed and smaller preovulatory LH surge leading to delayed ovulation. Injection of GnRH during oestrus increases the spontaneous LH peak and prevents delay in ovulation in repeat breeding animals.

5.2 Pharmacokinetic particulars


After intramuscular administration in cows, gonadorelin is rapidly absorbed from the injection site, with a plasma half-life of approximately 20 minutes.


An increase in the level of LH is detected thirty minutes after the administration, demonstrating fast distribution to the adenohypophysis.


The compound is rapidly metabolized into smaller inactive peptides and aminoacids.


The main excretion route is renal, although a significant proportion is also excreted in expired air.


6.1 List of excipients

Benzyl alcohol (E 1519)

Potassium dihydrogen phosphate

Dipotassium hydrogen phosphate

Sodium chloride

Water for injections

6.2 Incompatibilities

In the absence of compatibility studies, this veterinary medicinal product must not be mixed with other veterinary medicinal products.

6.3 Shelf life

Shelf-life of the veterinary medicinal product as packaged for sale: 18 months.

Shelf-life after first opening the immediate packaging: 28 days.

6.4. Special precautions for storage

Do not store above 25 ºC.

6.5 Nature and composition of immediate packaging

Material of the primary container

Type II colourless glass vials (6, 10, 20, 50 and 100 ml).

Type I bromobutyl stoppers.

Pack sizes

Cardboard box containing 1 glass vial of 6, 10, 20, 50 or 100 ml with a rubber stopper and aluminium cap.

Cardboard box with 10 glass vials of 6 ml with a rubber stopper and aluminium cap.

Not all pack sizes may be marketed.

6.6 Special precautions for the disposal of unused veterinary medicinal product or waste materials derived from the use of such products

Any unused veterinary medicinal product or waste materials derived from such veterinary medicinal products should be disposed of in accordance with local requirements.


Laboratorios SYVA S.A.U.

Avda. Párroco Pablo Díez, 49-57

24010 León



Vm 31592/4005


19 July 2011


July 2016


To be supplied only on veterinary prescription. For animal treatment only.

13 July 2016

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