Leuprolide dosage and evidence
Written by Aaron CuhaReviewed Sep 2026
The short answer
Leuprolide is a prescription medicine, not a research peptide. It has been used since the 1980s and is FDA-approved as Lupron for prostate cancer, endometriosis, fibroids and puberty that starts too early.
Evidence grade for Leuprolide: Moderate. The rule: at least one finished study in people, and at least 100 people who took it. The sum on this page: 2 completed trials, 199 people given it. A grade counts how much has been done to people, not whether it works.
- People given it
- 199
- Human studies
- 2
- Found nothing
- 0
Dose
Approved medicine. No human dose established for unlabelled uses
Labeled amounts sit on the prescribing information. This page records what trials measured, not a personal dose.
FDA-approved (Lupron)
3 effects reported, 1 unwanted, 2 wanted, by people using it, not a trial
Goal pages: Hormones and growth hormone
In plain English
In plain English, from Aaron
This is how I would explain it to a friend. The evidence, with the numbers, is further down the page.
Leuprolide is a prescription shot that shuts down your sex hormones. It is not a research peptide. A steady dose first boosts, then switches off, the brain signal that drives testosterone and oestrogen. It is sold as Lupron for prostate cancer, endometriosis, fibroids and puberty that starts too early.
What people take it for
- Treating prostate cancer by cutting testosterone.
- Easing endometriosis pain.
- Treating uterine fibroids.
- Pausing puberty that starts too early.
What studies in people showed
The biggest study had 199 men with prostate cancer that had spread. It lowered testosterone as well as the older oestrogen drug, DES. It caused far less breast growth, nausea, swelling and dangerous blood clots. In women with endometriosis, a monthly shot eased period pain and pelvic pain more than a dummy shot. It works by switching oestrogen off, which is not a mild thing to do.
What people report
Reports, not study results
The good
- Far fewer blood clots and less breast growth than the older prostate cancer drug.
- Less endometriosis pain than on a dummy shot.
The bad
- It shuts down testosterone or oestrogen. That is its job, and it is a big thing to do to a body.
- We have not collected user reports on this one yet.
Where these come from: Everything here is from the two human studies on this page. We have not collected forum or user reports for this one yet.
My bottom line
This is serious medicine for cancer and hormone disease. It is not a peptide to play with. Nobody should use it without a specialist.
An opinion, not a finding. I am a coach, not a doctor.
What it has been measured to do
Measured in people
Goals Leuprolide has been tested for in people, biggest studies first. We count only what the studies on this page say, so the real numbers may be higher.
- Testosterone and male hormones199 people · 1 study
35 of the 36 indexed goals have no study of any kind behind Leuprolide
No study in people, animals or cells on this page reports a result for these. That does not prove Leuprolide does nothing for them. It does mean anything you have heard about Leuprolide and one of these did not come from a study cited here.
Show full evidence
What is Leuprolide?
Leuprolide is a prescription medicine, not a research peptide. It has been used since the 1980s and is FDA-approved as Lupron for prostate cancer, endometriosis, fibroids and puberty that starts too early.
Leuprolide is a long-acting prescription medicine, not a research chemical. It works on GnRH, the brain switch that controls sex hormones. Given nonstop, it first boosts that system and then shuts it down. Testosterone or oestrogen falls a lot. That is the odd part: a steady signal shuts hormones down, while short bursts of gonadorelin turn them on. It is FDA-approved as Lupron for prostate cancer, endometriosis, uterine fibroids and puberty that starts too early. The human evidence goes back to 1984. In 199 men with prostate cancer that had spread, it lowered testosterone as well as the older oestrogen drug, DES. It caused far less breast growth, nausea, swelling and blood clots. In women with endometriosis, a monthly shot eased period pain and pelvic pain more than a dummy shot.
How does Leuprolide work?
A steady signal on the GnRH receptor wears out the pituitary gland's response. That sharply lowers LH, FSH and the sex hormones they control.
The evidence, in charts
Fig. 1a · how many people
199people, across 1 study in people cited here
| Study | People | Share |
|---|---|---|
| New England Journal of Medicine 1984 | 199 | 100% |
The whole total is one study of 199. Counts are the number of people each study on this page says it signed up. That includes studies that only watched people and gave nobody the compound. 1 more study in people gives no headcount and is not counted here. Studies still signing people up are left out, and only studies cited on this page are counted.
Fig. 1b · evidence mix
All 2 sources here are studies in people.
- Study in people · done in people2100%
Counted from the list of sources on this page. It counts only what we cite, so there may be more studies out there. A review counts once, however many studies it sums up.
Fig. 2 · evidence over time
Sources here come from just two years, 1984 and 1990.
Too few different years on this page to draw a timeline. The newest source on file is from 1990, more than five years ago. Research on it may have gone quiet.
Fig. 3 · legal status at a glance
US
Approved
UK
Approved
AU
Approved
CA
Approved
Approved in all four countries shown. This is what the law says, not a verdict on the science. See Legal status below for the full text and any notes.
Fig. 5 · what the molecule is
- Kind of compound
- Peptide
- Molecule weight
- 1,209.4 Da
- Half-life
- About 3 hoursShort, 1 to 6 hours
- Chain length
- None on file
No amino acid sequence is on file for Leuprolide, so none is drawn rather than guessed from a name.
The studies we cite
- Study in people1984Leuprolide versus diethylstilbestrol for metastatic prostate cancer
It matched the older treatment and was far easier to live with. A hundred and ninety nine men with prostate cancer that had spread took either leuprolide or the oestrogen drug used at the time. Both shut testosterone down about as well. The men on leuprolide had much less breast growth, sickness and swelling, and far fewer dangerous blood clots. That is why this kind of drug replaced the older one. Two treatments were compared here, so neither group went without.
199 patients: leuprolide suppressed testosterone comparably to DES with far fewer gynecomastia, nausea, edema and thromboembolic events.
- Study in people1990Lupron depot (leuprolide acetate for depot suspension) in the treatment of endometriosis: a randomized, placebo-controlled, double-blind study
For the pain of endometriosis, the monthly injection beat a dummy. Women were given either the depot shot or a dummy each month, and nobody involved knew which. Period pain, ongoing pelvic pain and tenderness on examination all improved more on the drug. Pain was rated by the women and their doctors, which is the only way to measure it and also the softest kind of measure. This ran for months, and the drug works by switching off oestrogen, which is not a mild thing to do.
Monthly 3.75 mg depot significantly improved dysmenorrhea, pelvic pain and tenderness versus placebo.
Where to buy Leuprolide
Leuprolide is an approved medicine. The approved product comes from a pharmacy, with a prescription. The vials below are sold “for research” and are not the approved drug.
No seller we track lists Leuprolide yet. We read sellers’ public product lists every week, and this section fills in as soon as one does. Every seller, graded
Common questions
Has Leuprolide been tested in people?
Yes. 199 people given it across 2 completed trials cited here, 0 of which found nothing. Leuprolide is a prescription medicine, not a research peptide. It has been used since the 1980s and is FDA-approved as Lupron for prostate cancer, endometriosis, fibroids and puberty that starts too early.
What is the Leuprolide dosage?
Approved medicine. No human dose established for unlabelled uses. Labeled amounts sit on the prescribing information. This page records what trials measured, not a personal dose. FDA-approved (Lupron)
Is Leuprolide FDA-approved?
FDA-approved (Lupron)
How can leuprolide both stimulate and suppress hormones?
It causes a short burst first, then the system wears out. A steady GnRH signal shuts it down. Pulses of the signal are what keep it running.