Cetrorelix 5mg


Product is injectable, in powder form, needs reconstitution before use. Please read more on our FAQ page

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Cetrorelix is a synthetic decapeptide that blocks the action of gonadotropin-releasing hormone (GnRH). GnRH normally stimulates the release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) from the anterior pituitary gland. In the middle of the menstrual cycle, estradiol (E2) boosts GnRH, causing an LH surge. This LH surge prompts dominant follicle ovulation, reinitiates oocyte meiosis, and begins luteinization, marked by rising progesterone levels.



This PRODUCT IS INTENDED FOR RESEARCH PURPOSES ONLY. Its usage should be limited to in vitro testing and laboratory experimentation. This product is not intended for any other purposes, including but not limited to medical, therapeutic, or diagnostic applications. It must not be used on humans, animals, or any living organisms.

Only licensed and qualified professionals with appropriate expertise should handle and manipulate this product. Any unauthorized use or misuse of this product is strictly prohibited by law. The manufacturer, distributor, and seller of this product do not assume any responsibility for its misuse or any consequences resulting from such behavior. By accessing or using this product, you agree to abide by these terms and conditions and acknowledge the inherent risks associated with its usage.




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What is Cetrorelix?

Cetrorelix is a man-made decapeptide that exhibits antagonistic properties against gonadotropin-releasing hormone (GnRH). GnRH is responsible for stimulating the production and release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) from the gonadotrophic cells in the anterior pituitary gland.
During the middle of the menstrual cycle, there is a positive feedback loop involving estradiol (E2), which amplifies GnRH release, leading to an LH surge. This surge in LH triggers the ovulation of the dominant follicle, restarts oocyte meiosis, and initiates luteinization, as evidenced by increasing progesterone levels.

Cetrorelix competes with natural GnRH for binding to membrane receptors on pituitary cells, effectively regulating the release of LH and FSH in a manner that depends on the dosage administered.

Mechanism of action.

Cetrorelix attaches to the receptor for gonadotropin-releasing hormone, functioning as a strong inhibitor of gonadotropin secretion. It competes with the naturally occurring GnRH for binding to the membrane receptors found on pituitary cells, effectively regulating the release of LH and FSH in a manner that depends on the dosage administered.

The impact of Cetrotide on LH and FSH is temporary and can be reversed upon discontinuation of treatment. In women, Cetrotide dose-dependently postpones the LH surge, and consequently, ovulation. FSH levels remain unaffected at the prescribed doses during controlled ovarian stimulation. After a single 3 mg dose of Cetrotide, its effects last for a minimum of 4 days. Administering Cetrotide at a dosage of 0.25 mg every 24 hours has been demonstrated to sustain this effect.


Cetrotide is quickly absorbed when administered via subcutaneous injection, with peak plasma concentrations typically reached within one to two hours post-administration. In healthy female subjects, the average absolute bioavailability of Cetrotide after subcutaneous injection is approximately 85%.


Cetrorelix should not be used in cases of severe renal impairment. It is not intended for women aged 65 years or older. The use of Cetrorelix is not advised for women with severe allergic conditions and should be approached with caution in those with active allergies or a history of allergies.

Additional info

Weight4 g
Dimensions10 × 10 × 20 mm

5mg, 10mg

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