Comparison
Cetrorelix vs. Triptorelin
Two peptides side-by-side — identity, evidence base, legal status and known adverse events.
Identity
Category
Research other
Research other
CAS no.
120287-85-6
57773-63-4
Molecular weight
1431.06 g/mol
1311.45 g/mol
Half-life
no data
3 h
Sequence
no data
pGlu-His-Trp-Ser-Tyr-D-Trp-Leu-Arg-Pro-Gly-NH2Mechanism of action
Cetrorelix
Cetrorelix competitively and immediately blocks the pituitary GnRH receptor, rapidly suppressing LH and FSH release — without the initial hormone surge ('flare') of GnRH agonists.
Triptorelin
Triptorelin binds with high affinity to the GnRH receptor in the pituitary. After initial stimulation of LH and FSH secretion (flare phase, about 1-2 weeks), receptor desensitisation follows with consecutive gonadotropin suppression. This results in a reversible chemical castration: in men testosterone, in women oestrogen suppression to the postmenopausal range.
Evidence base
Highest evidence
Human RCT
Human RCT
Studies
0
4
of which in humans
0
4
Effects recorded
2
3
Open conflicts
0
0
Documented adverse events
1
3
Legal status
Full entries
Frequently asked questions
- What is the difference between Cetrorelix and Triptorelin?
- Cetrorelix is classified as "Research other", while Triptorelin is classified as "Research other". Cetrorelix: Cetrorelix is a synthetic decapeptide and GnRH antagonist. It is used in assisted reproduction (IVF) to prevent a premature LH surge during controlled ovarian stimulation. Triptorelin: Synthetic decapeptide GnRH agonist with increased affinity over native gonadotropin-releasing hormone. FDA- and EMA-approved since the 1980s for prostate cancer, endometriosis and precocious puberty. This page contrasts both neutrally and source-based — with no usage or dosing recommendation.
- Which peptide is better supported by science, Cetrorelix or Triptorelin?
- The highest available evidence level is "Human RCT" for Cetrorelix and "Human RCT" for Triptorelin. A higher evidence level means more robust data, but says nothing about suitability for an individual. The full body of evidence is on each peptide's own page.
- What is the legal status of Cetrorelix and Triptorelin in Germany and the United States?
- Germany: Cetrorelix — Prescription, Triptorelin — Prescription. United States: Cetrorelix — Prescription, Triptorelin — Prescription. These are factual summaries with source and review date on the individual pages.