Evidence Grade A — Regulatory approved. 1197 published studies. 44 registered clinical trials.
Medically reviewed by a licensed medical professional
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Goserelin (sold as Zoladex) is a hormone-suppressing medication delivered as a tiny biodegradable implant injected under the skin of the abdomen, available in one-month and three-month formulations. It is used to treat prostate cancer, breast cancer in premenopausal women, and endometriosis by shutting down the body's production of sex hormones.
Goserelin is also known by these brand and alternate names:
1,197 published studies: 985 human, 33 animal, 47 in-vitro, 164 reviews
Goserelin is marketed as Zoladex by AstraZeneca, available as 3.6 mg monthly and 10.8 mg three-monthly subcutaneous implants. First approved in 1989, it is used in advanced prostate cancer, premenopausal breast cancer, endometriosis, and for thinning the uterine lining before surgical procedures.
Goserelin achieves castrate-level testosterone suppression (below 50 ng/dL) within two to four weeks. Its unique implant delivery system means there is no liquid injection, reconstitution, or refrigeration required — a practical advantage in some clinical settings. Like all GnRH agonists, it causes an initial hormone flare before suppression takes effect. Goserelin holds an important niche in breast cancer treatment, where it is used to suppress ovarian function in premenopausal women with hormone-receptor-positive disease, often in combination with aromatase inhibitors.
Goserelin works through the same mechanism as leuprolide — it mimics the brain's natural GnRH signalling hormone but provides a constant rather than pulsed signal, ultimately shutting down sex hormone production. What distinguishes goserelin is its delivery method: it is embedded in a small biodegradable implant that slowly dissolves over one or three months, providing a steady release of medication without the need for repeated injections or reconstitution.
Goserelin has decades of clinical data across multiple conditions. Its implant delivery system is distinctive — there is no liquid injection or reconstitution required, and it does not need refrigeration, which can be a practical advantage in some clinical settings. The three-monthly formulation reduces the number of clinic visits required. Like all GnRH agonists, goserelin causes an initial hormone surge before suppression takes effect (typically two to four weeks), which in prostate cancer patients requires co-prescribing an anti-androgen to manage. Long-term hormone suppression carries risks including bone density loss, cardiovascular effects, and metabolic changes. In breast cancer, goserelin holds an important niche for suppressing ovarian function in premenopausal women with hormone-receptor-positive disease, often combined with aromatase inhibitors.
PeptideTrace tracks 44 registered clinical trials for Goserelin sourced from ClinicalTrials.gov.
Clinical Study on the Preservation of Ovarian Function in Patients With Aplastic Anemia Following Allogeneic Hematopoietic Stem Cell Transplantation Using Goserelin
A Study to Learn How Well a Combination of Darolutamide and Androgen Deprivation Therapy (ADT) Works as a Treatment Before Surgery for Men Who Have High-risk Localized Prostate Cancer.
PRIAPUS-PCa Study: Stereotactic Body Radiation Therapy (SBRT) and Androgen Deprivation Therapy (ADT) Impact on Sexual Function on Men With Unfavorable Intermediate Risk Prostate Cancer
Study on Triple Therapy Combined With HIFU for High-Tumor-Burden mHSPC
Pilot Study of Neoadjuvant Chemotherapy Combined With Immunotherapy and Multimodal Thermal Therapy for HER2-negative Breast Cancer
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Goserelin is a synthetic decapeptide (10 amino acids) GnRH agonist with D-Ser(tBu)6 and aza-Gly10 modifications. It is uniquely delivered as a biodegradable PLGA implant (Zoladex) injected subcutaneously in the anterior abdominal wall.
Goserelin's mechanism is identical to other GnRH agonists: continuous non-pulsatile stimulation of the GnRH receptor leads to an initial hormonal flare followed by receptor downregulation, resulting in sustained suppression of LH, FSH, and downstream sex steroids to castrate or postmenopausal levels. The PLGA matrix biodegrades over the dosing interval, providing controlled release.
Goserelin is marketed as Zoladex (AstraZeneca), available as 3.6 mg monthly and 10.8 mg 3-monthly subcutaneous implants. First approved December 1989. Indications include advanced prostate cancer, breast cancer (pre/perimenopausal), endometriosis, and endometrial thinning prior to ablation. Testosterone suppression to castrate range achieved in approximately 91% of patients over 336 days.
Carbetocin has not been approved by the FDA. It is registered in over 80 countries for prevention of uterine atony and excessive bleeding after caesarean delivery. A heat-stable formulation was added to the WHO Essential Medicines List in 2019. The CHAMPION trial (WHO, 2018; over 29,000 women) compared a heat-stable carbetocin formulation to oxytocin for preventing postpartum haemorrhage after vaginal delivery, and found it to be non-inferior. The heat-stable formulation addresses a significant limitation of oxytocin, which degrades in warm climates without refrigeration — a major concern in low-resource settings where postpartum haemorrhage causes the most deaths. Its regulatory status varies by jurisdiction.
Kisspeptin-54 has no marketing authorisation. Phase II trials conducted primarily at Imperial College London have investigated its use as an IVF oocyte maturation trigger. One trial (60 patients) reported 95% oocyte maturation with zero cases of ovarian hyperstimulation syndrome. Kisspeptin-54 has a more advanced clinical evidence base than kisspeptin-10, with multiple Phase II studies in reproductive medicine. Its potential advantage over conventional IVF triggers relates to a lower risk of the serious complication of ovarian hyperstimulation. Clinical development is ongoing in academic settings. No Phase III trials have been completed.
Leuprolide is marketed as Lupron Depot, Eligard, and Fensolvi, and was first approved in 1985. It is available in depot formulations lasting one, three, four, or six months. Its clinical applications span multiple specialities: oncology (advanced prostate cancer), gynaecology (endometriosis, uterine fibroids), paediatric endocrinology (central precocious puberty), and reproductive medicine. Leuprolide's long clinical history provides extensive safety data. The initial hormone surge in the first one to two weeks can temporarily worsen symptoms — a well-known effect called 'flare' that is managed by co-prescribing an anti-androgen in prostate cancer patients. Long-term use carries risks including bone density loss, cardiovascular effects, and metabolic changes. Despite the availability of newer GnRH antagonists that avoid the initial flare, leuprolide remains the dominant treatment in this category due to its proven track record and range of formulations.
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