Head to head
Goserelin against Leuprolide
Two long-established GnRH agonists separated mainly by delivery, an implant against a depot injection. Both are prescription medicines with decades of use in prostate cancer and hormone-sensitive breast cancer.
Column A
GoserelinGoserelin (GnRH agonist)
A prescription medicine, not a research peptide: a GnRH agonist implant approved as Zoladex and in clinical use for decades for prostate cancer, hormone-sensitive breast cancer and endometriosis.
Column B
LeuprolideLeuprolide (GnRH agonist)
A prescription medicine, not a research peptide: a GnRH agonist in clinical use since the 1980s and FDA-approved as Lupron for prostate cancer, endometriosis, uterine fibroids and central precocious puberty.
Side by side, on the facts we can check
| Attribute | Goserelin | Leuprolide |
|---|---|---|
| Category | Hormone | Hormone |
| FDA status | FDA-approved (Zoladex) | FDA-approved (Lupron) |
| Half-life | ~4 hours (implant lasts 1-3 months) | ~3 hours (depot lasts months) |
| Molecular weight | 1,269.4 Da | 1,209.4 Da |
| Mechanism | Continuous GnRH receptor activation desensitizes the pituitary, reducing LH, FSH, testosterone, and estrogen. | Continuous GnRH receptor stimulation desensitizes the pituitary, sharply reducing LH, FSH, and downstream sex hormones. |
| Human studies cited | 2 | 2 |
| Legal status, US | FDA-approved, prescription only | FDA-approved, prescription only |
Frequently asked questions
What is the difference between Goserelin and Leuprolide?
Goserelin: A prescription medicine, not a research peptide: a GnRH agonist implant approved as Zoladex and in clinical use for decades for prostate cancer, hormone-sensitive breast cancer and endometriosis. Leuprolide: A prescription medicine, not a research peptide: a GnRH agonist in clinical use since the 1980s and FDA-approved as Lupron for prostate cancer, endometriosis, uterine fibroids and central precocious puberty.
Which has stronger research evidence, Goserelin or Leuprolide?
This database does not grade compounds. It counts what was run in people: 2 of the 2 studies cited on the Goserelin profile were human work, against 2 of 2 for Leuprolide. Those counts are of our own citation lists and understate any larger literature, and neither is a recommendation.
Are Goserelin and Leuprolide FDA-approved?
Goserelin: FDA-approved (Zoladex). Leuprolide: FDA-approved (Lupron).
Reviewed Sep 2026. This page sets two published records side by side. It is educational, it is not medical advice, and it contains no dosing protocols or recommendations for personal use.