EPO (Erythropoietin)_Dosage, benefits & legal status
Also known as erythropoietin, epoetin alfa, Epogen, Procrit, Retacrit, rHuEPO
A real medicine with a boxed warning, and the drug at the center of cycling's doping era.
Common vial size is what vendors typically sell, not a recommendation. Enter your own vial in the calculator.
What is EPO (Erythropoietin)?
Plain language first. The technical label stays, but it never stands alone.Overview
A prescription drug that makes your body produce more red blood cells. It has a boxed warning, it thickens the blood, and unmonitored use in cycling killed people.
Recombinant human erythropoietin, a glycoprotein hormone acting on erythroid progenitor EPO receptors to stimulate erythropoiesis. FDA-approved for anemia of CKD, chemotherapy-induced anemia and perioperative transfusion reduction. Carries a boxed warning for increased mortality, myocardial infarction, stroke, venous thromboembolism, thrombosis of vascular access and tumor progression. WADA prohibited at all times under S2.
What it's used for
Approved for anemia of chronic kidney disease and chemotherapy-induced anemia. Used illicitly in endurance sport to increase oxygen-carrying capacity.
How does EPO (Erythropoietin) work?
What it does in the body, and where.More red blood cells means more oxygen delivered, and also thicker blood.
- 01It tells bone marrow to make red cellsEPO binds receptors on red cell precursors in the marrow, increasing their production and survival.
- 02More red cells raises haematocritHaematocrit is the proportion of blood made up of cells. Raising it improves oxygen delivery, which is the therapeutic goal in anemia and the reason it is abused in endurance sport.
- 03And thicker blood clots more easilyThis is the mechanism behind the boxed warning and behind the deaths associated with its misuse. Blood that carries more oxygen also flows less easily.
What else is it used for?
Each use below carries its own evidence level. Approved means regulators have cleared it for that purpose. Investigational means it is in trials. Early research means it is being studied and is not established.
- Anemia of chronic kidney disease, as an approved indicationFDA-approved
- Chemotherapy-induced anemia, as an approved indicationFDA-approved
- Reducing transfusion requirements around surgery, as an approved indicationFDA-approved
- Endurance performance, which is prohibited in sport and dangerous outside medical supervisionnone
The published record
Papers and trials about EPO (Erythropoietin)
415 papers tagged human · 256 not reviews or lab · 95 clinical trial publications
1,053 registered trials · 25 with posted results
Furthest stage reached: Approved in the US
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Prohibited at all times, in and out of competition. S2.1 Erythropoietins (EPO) and agents affecting erythropoiesis: erythropoietin receptor agonists, e.g. erythropoietins (EPO). Non-Specified.RegulatorsCounted from Europe PMC indexing, not read by a person; a human tag can land on reviews, commentary or lab papers; clinical trial publications is the narrower count. 499 papers and 100 trials indexed in detail.
At a glance
Four things to know about EPO (Erythropoietin)
Evidence
FDA-approved
Category
Longevity and energy
Common vial
Varies
Half-life
About 4 to 13 hours after subcutaneous dosing
How much, and do you cycle it?
The range, and whether you take breaks.Set by an FDA label, in international units, one to three times weekly. No established pattern No range
No published human study establishes a schedule.
About 4 to 13 hours after subcutaneous dosingFDA label
Longer-acting analogs such as darbepoetin have substantially extended half-lives. The biological effect on red cell production lasts far longer than the drug is present.
Source: FDA prescribing information
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How is it given?
Dosing context and source notes.Supplied as a pen or prefilled syringe, so there is nothing to mix.
Approved dosing is indication-specific, in international units: 50–100 Units/kg three times weekly for chronic kidney disease, 100 Units/kg three times weekly in zidovudine-treated HIV, 150 Units/kg three times weekly or 40,000 Units weekly for chemotherapy, and 300 Units/kg daily or 600 Units/kg weekly around elective surgery. All are titrated against hemoglobin with regular blood monitoring, and epoetin carries a boxed warning.
How do you store it?
Before mixing, and after.Dry powder in the freezer or fridge. Once mixed, fridge, and use within about a month.
Unmixed lyophilized EPO (Erythropoietin) keeps for a long time cold. Once you add water the clock starts: most reconstituted vials hold up for roughly 28 to 30 days at fridge temperature. Keep it out of light, and do not freeze it after mixing.
What are the side effects and cautions?
Known cautions and warnings for this compound.Who should avoid it
- Uncontrolled high blood pressure
- A history of blood clots, stroke or heart attack
- Pure red cell aplasia following previous erythropoietin exposure
- Any use without medical supervision and blood monitoring
- Pregnancy or breastfeeding without specialist advice
Stop and get help
- Chest pain, shortness of breath, or pain and swelling in a limb, which can indicate a clot
- Sudden weakness, numbness or difficulty speaking
- Severe headache or a sudden rise in blood pressure
Common effects
- Carries an FDA boxed warning for increased risk of death, heart attack, stroke, blood clots and tumor progression.
- Raises blood pressure.
- Requires regular blood monitoring, which is the part that is absent outside medical use.
Where this page says nothing is established, that means nobody has studied it, not that a compound is safe.
Is EPO (Erythropoietin) approved?
And where the numbers on this page come from.Yes. EPO (Erythropoietin) is FDA approved and available on prescription in the United States. It is also approved in the European Union, the United Kingdom, Canada, and Australia.
- Approval statusFDA-approved
- RouteUnder the skin or into a vein
- Checked24 August 2026
- Approved outside the USEuropean Union, United Kingdom, Canada, Australia.This does not change the United States position above.
- DoseFrom the drug label. The manufacturer tested this range and a regulator reviewed it.
- Vial sizeFrom what vendors typically list; not a recommendation.
- SourcesNone traced yet.
What has happened recently
FDA-approved in 1989 for anemia of chronic kidney disease. In March 2007 the FDA added a boxed warning after controlled trials found that dosing to a hemoglobin target above 12 g/dL increased death, heart attack, stroke and clotting. The label was narrowed rather than withdrawn: use the lowest dose that avoids a transfusion, and do not use it in cancer patients who are not receiving chemotherapy. The boxed warning states that no trial has identified a hemoglobin target, dose or dosing strategy that does not increase these risks. Prohibited in sport at all times by WADA under section S2.
What regulators say
From official documentsProhibited at all times, in and out of competition. S2.1 Erythropoietins (EPO) and agents affecting erythropoiesis: erythropoietin receptor agonists, e.g. erythropoietins (EPO). Non-Specified.
Checked 12 September 2026WADA: The 2026 Prohibited List (in force 1 January 2026)
Banned in drug-tested sport. Most research peptides are prohibited under WADA's S0 category, which covers any substance with no approval from any regulatory authority for human use. That means a compound can be banned without ever being named on the prohibited list. Check with your own anti-doping authority rather than assuming absence from the list means permitted.
You can compare this against the whole library, or read how to check a seller.
What else is like EPO (Erythropoietin)?
Others in Longevity and energy, side by side.If you're weighing EPO (Erythropoietin), it's worth reading Thyreogen, Chelohart, and SHLP2 in the same class.
A real medicine with a boxed warning, and the drug at the center of cycling's doping era.
- Dose
- Set by an FDA label, in international units
- How often
- One to three times weekly
An animal-tissue extract for the thyroid, sold as capsules.
- Dose
- Research only
- How often
- Daily, in 10-30 day courses
An animal-tissue extract for the heart muscle, sold as capsules.
- Dose
- Research only
- How often
- Daily, in 10-30 day courses
A mitochondrial peptide with real published biology and no human dosing behind it.
- Dose
- Research only
- How often
- Not established
Guides for this compound
- How to Reconstitute a Peptide
Mix peptide powder with bacteriostatic water, step by step.
- How to Read an Insulin Syringe
Read the units, convert to millilitres, and draw the exact dose.
- mcg vs mg: The Peptide Dosing Mistake to Avoid
Your vial says mg and your protocol says mcg. Here is the conversion and how to check it.
Sources
No primary source has been traced for this compound yet. Treat everything on this page as unverified until one is. How we grade evidence
Beyond these, 599 records are indexed. Browse the records