hormoneInjectableControlledSchedule III (US, Anabolic Steroids Control Act)Not FDA-approvedPrescription only (US)Methenolone enanthate has never held FDA approval and has no human clinical trial record; the compound is a Schedule III anabolic steroid in the USAvailable human literature is limited to forensic/doping detection and animal toxicology rather than efficacy or safety trials
Methenolone EnanthateBenefits, Dosage & Interactions
Also known as: Primobolan, Primo
Methenolone enanthate, often known by its brand name Primobolan, is an injectable synthetic anabolic-androgenic steroid (AAS) derived from dihydrotestosterone (DHT). It is characterized by relatively mild anabolic properties and very low androgenic effects compared to many other steroids. Research on Methenolone Enanthate focuses on muscle and strength.
Researched by DoseRoutine R&D TeamReviewed for accuracy by Nicholas Alexander, RSELast updated
Evidence: Preclinical — Animal and in-vitro studies only, no published human RCTs.
Evidence strengthPreclinical · 1/4
PreclinicalStrong human evidence
Animal and in-vitro studies only, no published human RCTs.
Plasma half-life
Not established
Default unit
mg
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
- Reported amounts
- No human dosing is reported in the cited literature. The animal studies used 0.5 mg/kg intraperitoneally, five times weekly for 4 weeks, in rats (source 2); a livestock-residue study used 1 mg/day oral or 1 mg intramuscular doses in chickens, not humans (source 4)[2]
- Route studied
- Intramuscular injection is the conventional depot-ester route for this compound class; the cited animal work used intraperitoneal dosing[2]
Reported for Methenolone Enanthate in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the Methenolone Enanthate entry is written from. Each number matches an inline marker above.
- [1]Evaluation of Methenolone Enanthate Efficacy in Preventing MRONJ: A Randomized Trial on RatsGürses G, Sur E, Cengiz ZO, Körez MK · Journal of Oral Pathology & Medicine · 2024 · Peer-reviewed · PMID 39113433
- [2]Side effect of metenolone enanthate on rats heart in puberty: morphometrical studyOzdemir O, Bozkurt I, Ozdemir M, Yavuz O · Experimental and Toxicologic Pathology · 2013 · Peer-reviewed · PMID 23280519
- [3]Aspergillus niger-mediated biotransformation of methenolone enanthate, and immunomodulatory activity of its transformed productsHussain Z, Dastagir N, Hussain S, Jabeen A, Zafar S, Malik R · Steroids · 2016 · Peer-reviewed · PMID 27133901
- [4]Effect on sports drug tests of ingesting meat from steroid (methenolone)-treated livestockKicman AT, Cowan DA, Myhre L, Nilsson S, Tomten S, Oftebro H · Clinical Chemistry · 1994 · Peer-reviewed · PMID 7955383
How to track Methenolone Enanthate doses
Methenolone Enanthate is tracked as a protocol rather than a single reminder: a vial with a concentration, a schedule that may be titrated or cycled, and a rotation of injection sites. Here is the record that keeps all three consistent.
- 1
Record the vial and concentration
Log the vial strength and the volume of bacteriostatic water you added so Methenolone Enanthate is stored as a concentration rather than a guess. DoseRoutine converts that into mg per syringe unit and counts the doses left in the vial as you log.
- 2
Set the schedule, not just a reminder
Enter the dose in mg and the frequency. Cycled protocols get a start and end date so the history stays accurate when Methenolone Enanthate comes out of the routine.
- 3
Rotate and log the injection site
Pick the site at the moment you log the dose. The site map shows what you used last and how recently, which is the part that drifts fastest when two compounds run on different frequencies.
- 4
Log adherence, not intentions
Mark each dose taken, skipped or delayed as it happens. Weeks of honest logs are what make an adherence rate or a trend line meaningful; retrospective guessing is not.
- 5
Review against outcomes
Review Methenolone Enanthate alongside your logged metrics and any relevant blood work every few weeks before changing the dose, so the change is a response to data rather than to a good or bad day.
What to log each time
- Dose in mg and the syringe units it worked out to
- Vial: reconstitution date, concentration, doses remaining
- Injection site and time
- Any side effects in the 24 h after the dose
References & Evidence
Sources on this page that document Methenolone Enanthate dosing, timing and safety.
- [1]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is Methenolone Enanthate studied for?
What is Methenolone Enanthate?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Methenolone enanthate, often known by its brand name Primobolan, is an injectable synthetic anabolic-androgenic steroid (AAS) derived from dihydrotestosterone (DHT). It is characterized by relatively mild anabolic properties and very low androgenic effects compared to many other steroids. In medical contexts, methenolone enanthate has been used to treat muscle wasting in diseases, osteoporosis, and to promote weight gain in underweight infants. It is specifically an enanthate ester formulation, meaning it has a long-acting profile due to the slow release of methenolone from the injection site. This extended release allows for less frequent administration compared to shorter-esterified versions. Methenolone enanthate is a controlled substance in many countries due to its potential for misuse and abuse, particularly in non-medical settings for performance and physique enhancement. It is known for its ability to promote lean muscle mass gains and increase strength without significant estrogenic side effects like water retention or gynecomastia. However, like all anabolic steroids, it carries a risk of androgenic side effects and suppression of natural testosterone production.
What does the research say about Methenolone Enanthate?
Tap a section to expand.
Methenolone enanthate exerts its effects by binding to androgen receptors within target cells, similar to natural testosterone. Once bound, the steroid-receptor complex translocates to the cell nucleus, where it interacts with specific DNA sequences (androgen response elements). This interaction modulates gene transcription, leading to increased protein synthesis and a reduction in protein degradation, which collectively promote an anabolic (tissue-building) state. Being a derivative of dihydrotestosterone (DHT), methenolone is not aromatized into estrogen by the aromatase enzyme, unlike many testosterone-derived steroids. This explains its lack of estrogenic side effects. Its anabolic-to-androgenic ratio is considered favorable, meaning it promotes muscle growth more effectively with fewer masculinizing side effects compared to more potent androgens. The enanthate esterification at the 17-beta hydroxyl group slows its release from the injection site, resulting in a prolonged half-life and sustained physiological effects. Once cleaved from the ester, the active methenolone molecule acts on androgen receptors and also reduces sex hormone-binding globulin (SHBG) levels, thereby increasing the amount of free, biologically active testosterone (if present) and other anabolic hormones in circulation. (DrugBank, PubChem)
Source for this section: Sources for How does Methenolone Enanthate work?: Jumps to this entry in the sources and references list at the end of the page.
The primary benefits associated with methenolone enanthate stem from its anabolic properties and low androgenic/estrogenic activity. Medically, it has been utilized for:
- **Muscle wasting conditions**: To help patients regain or maintain muscle mass in conditions like AIDS, cancer, and other chronic catabolic states. (DrugBank)
- **Anemia**: In some cases, it has been used to stimulate red blood cell production, though less commonly than other agents. (PubChem)
- **Osteoporosis**: To improve bone density due to its anabolic effects on bone tissue. (DrugBank)
- **Pediatric weight gain**: Historically used in underweight infants and premature babies to promote growth and weight gain, although this use is now less common due to the availability of safer alternatives. (DrugBank)
In non-medical contexts, individuals may seek methenolone enanthate for:
- **Lean muscle gain**: Promoting relatively slow but high-quality muscle mass, often seen as 'dry' gains without significant water retention.
- **Strength improvement**: Enhancing physical strength and endurance.
- **Muscle preservation during caloric deficit**: Its anti-catabolic properties can help maintain muscle tissue even during periods of calorie restriction, making it popular during 'cutting' cycles.
- **Reduced estrogenic side effects**: Its inability to aromatize prevents estrogen-related issues such as gynecomastia and excessive water retention.
- **Low androgenic activity**: Compared to many other steroids, it has a lower propensity for androgenic side effects like acne, oily skin, and male pattern baldness, though these risks are still present.
This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Methenolone enanthate's therapeutic efficacy has been documented in various medical literature, primarily concerning its use in muscle wasting syndromes and conditions requiring anabolic support. For example, studies have shown its utility in promoting positive nitrogen balance and weight gain in catabolic states. (PubChem) However, due to its classification as a controlled substance and the development of alternative therapies, extensive modern clinical trials focusing solely on methenolone enanthate in humans are less common than in prior decades. Much of the understanding of its effects also comes from its historical clinical use and pharmacological profiling. The understanding of its mechanism and effects is generally well-established within pharmacology and toxicology literature. (DrugBank)
While considered mild in comparison to some other anabolic steroids, Methenolone Enanthate is not without potential side effects. These can include:
- **Androgenic side effects**: Although low, risks include acne, oily skin, increased facial/body hair growth, and accelerated male pattern baldness in predisposed individuals. In females, virilization symptoms such as deepening of the voice, clitoral enlargement, and menstrual irregularities can occur.
- **Cardiovascular effects**: Negative impact on lipid profiles, including decreased high-density lipoprotein (HDL, 'good cholesterol') and increased low-density lipoprotein (LDL, 'bad cholesterol'), potentially increasing the risk of cardiovascular disease.
- **Testosterone suppression**: Exogenous administration of methenolone enanthate will suppress natural endogenous testosterone production, which can lead to symptoms like low libido, erectile dysfunction, fatigue, and mood disturbances. Post-cycle therapy (PCT) is often required to restore natural hormone levels.
- **Hepatotoxicity**: While methenolone enanthate is not 17-alpha-alkylated (which is commonly associated with liver toxicity in oral steroids), there is still a theoretical, albeit rare, risk of liver strain with prolonged high-dose use, particularly if other liver-toxic substances are concurrently used.
- **Injection site pain/inflammation**: As with any injectable substance, local pain, swelling, or infection at the injection site is possible.
- **Mood changes**: Some users report irritability, aggression ('roid rage'), or other psychological disturbances.
This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Methenolone enanthate should be used with extreme caution and only under strict medical supervision. Key warnings include:
- **Risk of abuse**: Due to its potential for muscle growth and performance enhancement, it is frequently abused by athletes and bodybuilders, leading to significant health risks.
- **Cardiovascular disease**: Individuals with pre-existing cardiovascular conditions, hypertension, or high cholesterol should avoid methenolone enanthate due to its potential to worsen these conditions and increase cardiovascular risk.
- **Liver function**: While less hepatotoxic than oral anabolic steroids, individuals with impaired liver function should exercise caution. Regular monitoring of liver enzymes may be necessary.
- **Prostate issues**: Male users, particularly older individuals, should be aware of potential exacerbation of benign prostatic hyperplasia (BPH) or an increased risk of prostate cancer, although the latter is a subject of ongoing debate and research.
- **Psychological effects**: Users should be monitored for mood swings, aggression, or other behavioral changes.
- **Fertility**: Suppression of natural testosterone can lead to temporary or, in some cases, prolonged or permanent infertility in males.
- **Women and children**: Use in women carries a high risk of irreversible virilization. Use in children can lead to premature epiphyseal closure, stunting growth.
This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Methenolone enanthate is contraindicated in individuals with:
- **Known hypersensitivity** to methenolone or any of its excipients.
- **Carcinoma of the prostate or male breast**: Due to its androgenic nature, it can stimulate the growth of hormone-sensitive cancers.
- **Severe cardiac, hepatic, or renal disease**: As it can exacerbate these conditions.
- **Pregnancy and breastfeeding**: Due to the high risk of fetal harm and virilization of the infant.
- **Hypercalcemia**: Especially in women with metastatic breast carcinoma.
- **Undiagnosed vaginal bleeding**.
This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Combining methenolone enanthate with certain pharmaceutical agents or substances can either increase the risk of side effects or alter its therapeutic effects. While not exhaustive, potential interactions include:
- **Oral anticoagulants (e.g., Warfarin)**: Anabolic steroids can enhance the effects of anticoagulants, increasing the risk of bleeding. Close monitoring of INR and dose adjustments may be necessary. (FDA label for other AAS)
- **Corticosteroids**: Concomitant use may increase the risk of edema.
- **Insulin and oral hypoglycemic agents**: Anabolic steroids can alter glucose tolerance and decrease blood glucose levels, potentially requiring dosage adjustments of antidiabetic medications. (FDA label for other AAS)
- **Hepatotoxic drugs**: Although methenolone enanthate is less hepatotoxic, combining it with other drugs known to cause liver damage could theoretically increase the risk of liver injury.
- **Alcohol**: Excessive alcohol consumption while using methenolone enanthate can exacerbate potential liver strain and cardiovascular risks.
- **Other anabolic steroids**: Stacking with other anabolic steroids can significantly increase the risk and severity of all side effects, including cardiovascular, androgenic, and suppressive effects, without necessarily providing proportionally greater benefits.
This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Methenolone enanthate is an injectable compound with a long-acting ester. Due to its long half-life of approximately 240 hours (10 days), injections are typically administered weekly. The specific dose and frequency must be directed by a licensed clinician based on individual medical needs and response. Self-administration or use outside of medical guidance is strongly discouraged.
Source for this section: Sources for When should you take Methenolone Enanthate?: Jumps to this entry in the sources and references list at the end of the page.
What interacts with Methenolone Enanthate?
| Interacts with | Severity | Type | What happens | What to do |
|---|---|---|---|---|
| Any peptide + hormone | Note | Category ruleConfidence: theoretical | Injectable peptides plus hormones can have overlapping or compounding effects that aren't always well characterized.Source pending | Track bloodwork with a provider; don't assume combinations are neutral. |
Frequently asked questions about Methenolone Enanthate
Methenolone Enanthate is a hormone. It is also known as Primobolan and Primo. The references summarized come from NIH and PubMed records, FDA labeling where it exists, and Mayo Clinic patient material.
Methenolone Enanthate is commonly discussed in the context of supporting muscle. Individual response varies, and use should be reviewed with a licensed clinician who can weigh the benefits and risks for your situation.
For Methenolone Enanthate, it is typically administered by injection and it is typically taken null. Always follow the specific dose your clinician or the product label prescribes.
Methenolone Enanthate carries potential side effects and drug interactions, documented in NIH, Mayo Clinic, and FDA label sources. Methenolone Enanthate is classified as a controlled substance in some jurisdictions, so legal status and prescribing rules apply. Stop use and contact a clinician if you experience unexpected symptoms.
As a hormone, Methenolone Enanthate can overlap with other supplements, prescription medicines, hormones and peptides. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers Methenolone Enanthate with no sign-up.
Whether Methenolone Enanthate fits alongside testosterone replacement therapy depends on the protocol — dose, ester and ancillaries such as HCG or anastrozole — and on current bloodwork. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
"Peptides" is not one category — healing peptides, GLP-1 agonists, growth-hormone secretagogues and melanocortins each behave differently next to Methenolone Enanthate. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
Published frequency for Methenolone Enanthate varies by protocol and formulation, so the label or prescription is what sets it. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
The effect of a missed dose of Methenolone Enanthate depends on the protocol and formulation you are on. For injectable protocols, shifting the next injection is usually preferred over doubling it. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For an injectable like Methenolone Enanthate the record needs more than a checkbox: vial concentration, the measured volume, and which site the last injection went into. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
Which studies looked at Methenolone Enanthate?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.Effect of methenolone enanthate (NSC-64967) in advanced cancer of the breast(opens PubMed in a new tab)Cancer · 1968 · PMID 4952912 · https://pubmed.ncbi.nlm.nih.gov/4952912/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 248271(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/248271
Verify at
Publisher search links for Methenolone Enanthate. These are places to check the information — they are not citations, so they are not numbered.
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- FDA-approved labeling (DailyMed)(publisher search, opens in a new tab)U.S. Food and Drug Administration · publisher search
- MedlinePlus(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- Wikipedia entry(publisher search, opens in a new tab)Wikipedia · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on Methenolone Enanthate?
Plain-text summary, safe to quote verbatim:
Methenolone enanthate, often known by its brand name Primobolan, is an injectable synthetic anabolic-androgenic steroid (AAS) derived from dihydrotestosterone (DHT). It is characterized by relatively mild anabolic properties and very low androgenic effects compared to many other steroids. Research on Methenolone Enanthate focuses on muscle and strength.
Source: DoseRoutine — https://doseroutine.com/library/methenolone-enanthate
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Methenolone Enanthate — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/methenolone-enanthate
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Which goals is Methenolone Enanthate used for?
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