Anadrol vs Dianabol: Effects, Toxicity and Medical Context
Anadrol and Dianabol are different oral anabolic androgenic steroids. Anadrol contains oxymetholone; Dianabol contains methandienone. Both are 17 alpha alkylated and can harm the liver, lipids, blood pressure and hormone function. Oxymetholone has a documented United States anemia medicine record, while methandienone evidence is older. Neither is a safe nonmedical choice.
Evidence boundary: no direct comparative trial was found. Separate studies used different populations, endpoints, exposure patterns and monitoring. A result in anemia or AIDS wasting cannot decide which drug is better for healthy physique use.
Sources checked 3 September 2026. This page gives general information. It does not provide a dose, cycle, stack, product source, administration method, personal suitability decision or drug testing advice.
What is the main difference between Anadrol and Dianabol?
Anadrol is a trade name associated with oxymetholone. Dianabol is a trade name associated with methandienone. Methandrostenolone and metandienone are other names for the Dianabol substance.[1][2]
Both are orally active anabolic steroids, but their structures and medical records differ.
No direct trial compares them under the same conditions. A confident ranking for gain, strength or toxicity would exceed the evidence.
| Attribute | Anadrol | Dianabol | Evidence reading |
|---|---|---|---|
| Active drug | Oxymetholone | Methandienone, also called methandrostenolone | Established identity |
| Molecular formula | C21H32O3 | C20H28O2 | Authority substance records |
| Common form | Oral tablet in the historic medicine record | Oral tablet in historic medicine records | A product label cannot prove contents |
| United States medicine record | Documented anemia treatment history | No current United States prescription label found | Medical status is not equal |
| Human outcome evidence | Selected patient studies for anemia or wasting | Small older studies in selected groups, including trained men | Populations and endpoints differ |
| Strength evidence | No direct comparative trial found | One small trial did not show greater strength improvement than placebo | No winner can be derived |
| Liver concern | Strong product and class warning evidence | Strong oral steroid class concern with less current product evidence | No matched toxicity rate |
| United States control | Schedule III, code 4000 | Schedule III, code 4000 | Current federal list dated 27 August 2026 |
| Tested sport | Prohibited at all times | Prohibited at all times | World Anti Doping Agency category S1 |
| Safe nonmedical choice | No | No | Neither has a proven safe physique use |
Are Anadrol and Dianabol the same drug or the same formulation?
No. Oxymetholone has formula C21H32O3. Methandienone has formula C20H28O2. The different formulas reflect different reference molecules.[13][14]
Both names are linked with oral tablets. The form does not make them interchangeable or verify a product.
| Question | Anadrol | Dianabol |
|---|---|---|
| Stable generic identity | Oxymetholone | Methandienone |
| Not the same as | Methandienone | Oxymetholone |
| What a label cannot prove | Contents, concentration, purity or legitimacy | Contents, concentration, purity or legitimacy |
Read the separate Anadrol and oxymetholone record or the Dianabol and methandienone record for identity evidence.
How does the medical context differ?
Oxymetholone was used for selected anemias caused by inadequate red cell production. FDA records preserve the Anadrol 50 application and revised labelling history. The 2004 approval letter also records an interaction warning involving anabolic steroids and warfarin.[3]
Methandienone was used historically in some medical settings. Its old prescription history does not create a current United States indication. A chemical record is not a product approval.
| Record | Oxymetholone or Anadrol | Methandienone or Dianabol | Correct interpretation |
|---|---|---|---|
| Medicine history | Used for selected anemias caused by deficient red cell production | Used historically for several indications in some markets | Past prescribing does not authorize physique use |
| Current United States evidence | FDA records preserve an approved Anadrol 50 application and labelling history | No current DailyMed prescription label was found in the checked record | Current status differs between products |
| Research populations | Selected patients with marrow disorders or wasting | Selected patients and small groups of trained men | Results apply to the studied population |
| Clinical monitoring | Blood count, liver effects and interactions formed part of medical care | Older research does not supply a current monitoring standard | Monitoring does not make nonmedical use safe |
| Decision boundary | A specialist may judge a named medical indication | Historic use does not create a current indication | Neither record supplies a personal steroid choice |
These histories do not show that either drug is suitable for bodybuilding or self treatment.
What does human research show about effects?
A 1976 double blind crossover trial studied methandienone in eleven athletic men during weight training. Body mass and muscle size increased. Strength and performance improved during both periods, but the drug period did not outperform placebo. Plasma testosterone also fell.[4]
The investigators said intracellular fluid might explain part of the measured change. Lean mass and visible fullness do not equal new contractile tissue.
Oxymetholone studies addressed other populations. A controlled trial in adults with AIDS associated wasting examined body mass and liver outcomes.[5] That patient evidence cannot be used as a healthy performance comparison.
| Evidence source | Population and purpose | Main result relevant here | Why it cannot decide Anadrol vs Dianabol |
|---|---|---|---|
| Oxymetholone medicine record | Patients with deficient red cell production | Red cell stimulation was the treatment purpose | Healthy physique outcomes were not the treatment question |
| Oxymetholone wasting trial | Adults with AIDS associated wasting | Body mass outcomes and liver measures were studied | Illness, endpoints and clinical oversight differ from healthy use |
| Methandienone crossover trial | Eleven athletic men during weight training | Body mass and muscle size rose, but strength improvement did not exceed placebo | The study was small and did not include oxymetholone |
| Direct comparative trial | No matched Anadrol versus Dianabol trial found | No same population comparison is available | A winner, safer option or risk ratio cannot be calculated |
Does Anadrol or Dianabol produce more size or strength?
No reliable direct answer is available. Online rankings mix personal reports, unlike products and different combinations.
Oxymetholone can cause sodium and water retention. Methandienone research also leaves fluid as an explanation for part of a measured change. A faster scale increase is not proof of more muscle.
| Claimed outcome | What evidence can support | What remains uncertain |
|---|---|---|
| Faster scale increase | Both drugs can change body mass and fluid balance | The amount that is tissue, water, glycogen or food |
| Greater muscle gain | Androgen signalling makes tissue growth plausible | Typical gain in healthy users and the contribution of other drugs |
| Greater strength | Training can improve strength during either exposure | A direct drug difference has not been established |
| Better risk to benefit balance | Medical benefit can be judged only for a defined indication | No favorable nonmedical balance is established for either drug |
Missing follow up and silent test changes can make one drug look more favorable than the evidence supports.
Is Anadrol more toxic than Dianabol?
No matched human study gives a trustworthy toxicity ranking. Both are 17 alpha alkylated oral steroids. This structural class is strongly associated with cholestatic liver injury.[6]
Oxymetholone has more modern product and patient evidence. That difference does not prove it is always more harmful.
| Risk area | Anadrol evidence | Dianabol evidence | Shared boundary |
|---|---|---|---|
| Liver and bile flow | Product labelling, patient trials and class evidence support serious concern | Oral steroid class evidence supports concern; current product data are sparse | No direct trial shows one is safe or reliably safer |
| Blood lipids | Adverse lipid changes are a recognized androgen concern | Adverse lipid changes are a recognized androgen concern | Magnitude varies and may be silent |
| Blood pressure and fluid | Sodium and water retention can be marked | Fluid retention can occur through androgen and estrogen related pathways | Symptoms do not reveal the full cardiovascular effect |
| Blood count | Red cell stimulation is central to its medicine history | External androgens can alter blood measures | A high hematocrit needs clinical interpretation |
| Hormones and fertility | Natural hormone and sperm production can fall | Older research found lower plasma testosterone; class suppression also applies | Recovery varies and can be prolonged |
Neither drug has a proven no harm exposure for nonmedical use. Feeling well does not rule out high blood pressure, adverse lipids, hormone suppression or early liver injury.[9]
Read the site records on liver injury and cardiovascular effects for organ specific evidence.
Which interactions and health settings raise concern?
Oxymetholone labelling records a clinically important warfarin interaction. Methandienone lacks a current United States product label, so its interaction record is less complete. Missing data do not prove compatibility.
Alcohol, stimulants, other androgens and liver active drugs can add risk or obscure the cause of symptoms.
| Context | Why it matters | Useful action |
|---|---|---|
| Liver or bile disease | Both are oral alkylated steroids with liver concern | Give a clinician the complete substance and alcohol history |
| Heart, kidney or edema history | Fluid, blood pressure and lipid changes can worsen existing disease | Seek direct medical review rather than comparing forum rankings |
| Anticoagulant medicine | Oxymetholone labelling records interaction concern with warfarin | Do not change prescribed treatment without the prescriber |
| Fertility plans or pregnancy | External androgens can suppress fertility and harm fetal development | Use prompt professional care for exposure or pregnancy concern |
| Depression, psychosis or dependence | Mood change and withdrawal can become urgent | Use emergency help for suicidal intent, psychosis or immediate danger |
The anabolic steroid interaction and contraindication record explains the broader clinical questions. It does not clear a combination as safe.[10]
Why can separate studies give a misleading comparison?
A fair comparison needs the same population, outcomes, product verification and clinical oversight. These drugs lack that matched evidence.
| Mismatch | Example | Effect on the comparison |
|---|---|---|
| Different population | Anemia or AIDS wasting patients versus trained healthy men | Benefit and harm cannot be transferred directly |
| Different endpoint | Red cell production, body mass, muscle size and strength are separate outcomes | One positive outcome cannot stand for every effect |
| Different product | A regulated medicine record versus an unverified tablet | Identity and concentration uncertainty change the risk picture |
| Different monitoring | Clinical trials use selection, follow up and stopping rules | Unsupervised exposure does not reproduce the trial setting |
The absence of direct evidence is not evidence that the drugs are equal. It means the size of any difference remains unknown.
What are the current United States and sport rules?
The current DEA alphabetical list places oxymetholone and methandienone in Schedule III. Each uses controlled substance code 4000.[7]
The 2026 World Anti Doping Agency list names both drugs under category S1. Anabolic agents in this category are prohibited at all times.[8]
| System | Anadrol or oxymetholone | Dianabol or methandienone | Scope |
|---|---|---|---|
| United States federal control | Schedule III, controlled substance code 4000 | Schedule III, controlled substance code 4000 | Current DEA alphabetical list dated 27 August 2026 |
| United States medicine status | FDA records preserve an Anadrol 50 medicine application and labelling history | No current United States prescription label found in the checked record | Approval is product and indication specific |
| Competitive sport | Named anabolic agent prohibited at all times | Named anabolic agent prohibited at all times | World Anti Doping Agency 2026 list |
Legal status depends on place, date, product and conduct. Sport rules and criminal law answer different questions.
Can tablet colour, packaging or a seller test identify either drug?
No. A trade name, tablet colour, imprint, photograph, price or seller certificate cannot confirm identity, concentration or purity. Counterfeit products can copy packaging and batch numbers.
A laboratory result describes only the tested sample and method. Product uncertainty weakens every effect and risk comparison.
After suspected exposure or harm, record the claimed product, dates, symptoms and other substances. Share this information with a clinician or poison service. Severe symptoms need emergency care.
References
- Oxymetholone substance record. United States Food and Drug Administration.
- Methandrostenolone identity record. National Library of Medicine Medical Subject Headings.
- Anadrol 50 supplemental approval letter. United States Food and Drug Administration. 25 August 2004.
- Methandienone effects in men undergoing athletic training. The Lancet. 1976. PMID 61389.
- Controlled oxymetholone trial for AIDS associated wasting. AIDS. 2003. PMID 12646793.
- Androgenic steroids and liver injury. LiverTox, National Library of Medicine.
- Controlled substances in alphabetical order. United States Drug Enforcement Administration. 27 August 2026.
- The 2026 Prohibited List. World Anti Doping Agency. Effective 1 January 2026.
- Adverse health consequences of drugs used for performance. Endocrine Society.
- Diagnosis and management of anabolic androgenic steroid use. Journal of Clinical Endocrinology and Metabolism. 2019.
- Anadrol and oxymetholone compound record. Anabolic.co. Updated 1 September 2026.
- Dianabol and methandienone compound record. Anabolic.co. Updated 1 September 2026.
- Oxymetholone compound record. PubChem.
- Methandrostenolone compound record. PubChem.