Evidence Grade A — Regulatory approved. 375 published studies. 167 registered clinical trials.
Medically reviewed by a licensed medical professional
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Degarelix (sold as Firmagon) is a monthly injection for advanced prostate cancer that suppresses testosterone — the hormone that fuels prostate cancer growth. Unlike older hormone treatments that cause a temporary surge in testosterone before shutting it down, degarelix blocks hormone signals immediately. This matters most for patients with symptoms like bone pain, where a hormone surge could make things worse.
Degarelix is also known by these brand and alternate names:
375 published studies: 245 human, 28 animal, 17 in-vitro, 74 reviews
Degarelix is marketed as Firmagon (approved December 2008) for advanced prostate cancer. It is administered as a monthly subcutaneous injection, with a loading dose of 240 mg followed by 80 mg monthly. Injection-site reactions are common (pain in 35%, redness in 32%).
The key clinical advantage of degarelix over traditional GnRH agonists is the absence of testosterone flare, making it particularly suitable for patients with symptomatic metastatic disease where a hormone surge could worsen bone pain or urinary obstruction. It achieves castrate testosterone levels within three days. However, monthly injections with notable injection-site discomfort have limited its uptake compared to longer-acting GnRH agonist depots, and the oral GnRH antagonist relugolix has emerged as a more convenient alternative with potential cardiovascular advantages.
Unlike GnRH agonists (such as leuprolide and goserelin) which overstimulate and then exhaust the hormone system, degarelix directly blocks the GnRH receptor in the pituitary gland, preventing hormone signals from getting through at all. This means testosterone levels drop immediately — within days rather than weeks — and critically, there is no initial hormone surge or 'flare' effect. This distinction matters clinically because the flare can temporarily worsen prostate cancer symptoms and requires additional medication to manage.
Degarelix achieves castrate testosterone levels within three days, avoiding the one-to-two-week hormone surge ("flare") seen with older GnRH agonist treatments. The CS21 trial showed faster initial disease marker suppression compared to the agonist leuprolide. For patients at risk of flare-related complications — such as spinal cord compression or urinary obstruction from tumour swelling — this immediate suppression is a meaningful clinical advantage. However, degarelix requires monthly injections that frequently cause injection-site pain (35%) and redness (32%), which has limited its uptake compared to longer-acting alternatives. The oral GnRH antagonist relugolix (Orgovyx) has further reduced degarelix's niche by offering the same flare-free suppression in a daily tablet with potential cardiovascular advantages, as demonstrated in the HERO trial.
PeptideTrace tracks 167 registered clinical trials for Degarelix sourced from ClinicalTrials.gov.
Open-Label, Randomised Parallel-Group Study
Assessing Efficacy of Neoadjuvant ADT in Localized High-Risk Prostate Cancer Patients Utilizing 18F-Flotufolastat PSMA PET/CT
Supraphysiologic Testosterone Priming Induces Darolutamide Extended Response
Safety and Efficacy Evaluation of LC-K76 in Patients With Metastatic Hormone-Sensitive Prostate Cancer
Safety and Preliminary Efficacy Evaluation of LC-K76 Plus Anti-PD-1 Therapy in Patients With Metastatic Castration-Resistant Prostate Cancer (mCRPC)
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Health Canada Market Authorisation
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EMA Marketing Authorisation
Degarelix is a synthetic linear decapeptide (10 amino acids) GnRH antagonist containing 7 unnatural amino acids. Unlike GnRH agonists, it acts as a competitive receptor antagonist, blocking GnRH binding and immediately suppressing gonadotropin release without an initial hormonal flare.
Degarelix binds competitively to GnRH receptors in the anterior pituitary, directly blocking endogenous GnRH from stimulating LH and FSH release. This produces immediate and sustained testosterone suppression without the initial surge seen with GnRH agonists. Castrate testosterone levels are achieved by day 3 in 96.1% of patients (versus 0% with leuprolide at day 3). At the injection site, degarelix forms a gel-like depot from which it is slowly released.
Degarelix is marketed as Firmagon (approved December 24, 2008) for advanced prostate cancer. Administered as monthly subcutaneous injection (loading dose 240 mg, then 80 mg monthly). Prominent injection-site reactions are common (pain 35%, erythema 32%). In the pivotal trial (N=610), degarelix achieved castrate testosterone in 98.3% by day 28, noninferior to leuprolide.
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.
Nafarelin is marketed as Synarel (approved 1990) for endometriosis and central precocious puberty. It requires administration as one spray in each nostril twice daily — a higher frequency than injectable alternatives but avoids needles entirely, which can be a significant advantage for some patients, particularly children. Clinical trials showed symptom improvement in 75–92% of endometriosis patients. However, absorption can be affected by nasal congestion or concurrent use of nasal decongestants, which can be a practical limitation. As with all GnRH agonists, prolonged use leads to bone density loss, and treatment for endometriosis is typically limited to six months. Nafarelin occupies a niche for patients who prefer non-injectable hormone suppression, though it has become less commonly prescribed as longer-acting depot injections and oral alternatives have become available.
Triptorelin is marketed as Trelstar (approved 2000) for advanced prostate cancer, available as intramuscular depot injections in monthly (3.75 mg), three-monthly (11.25 mg), and six-monthly (22.5 mg) formulations. It is also widely used internationally for gender-affirming care and central precocious puberty. Triptorelin is one of the most commonly used GnRH agonists globally, though it faces the same competitive pressure as other agents in this class from newer oral GnRH antagonists like relugolix, which avoid the initial hormone flare and offer potential cardiovascular advantages. Clinical data demonstrate reliable testosterone suppression comparable to other GnRH agonists in this class.
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