Anadrol is the brand name for oxymetholone, one of the most potent oral anabolic-androgenic steroids ever developed. It was approved by the U.S. Food and Drug Administration for treating anemias caused by deficient red blood cell production, and it remains in clinical use for that purpose today.1PubMed. Review of oxymetholone: a 17alpha-alkylated anabolic-androgenic steroid Outside of that narrow medical niche, oxymetholone has a complicated reputation: it builds muscle mass and strength faster than almost any other oral steroid, but it also carries serious risks to the liver, the hormonal system, and cardiovascular health. Understanding both sides of that equation matters whether you are a patient, a clinician, or simply someone who has heard gym talk about “A-bombs” and wants to know what the drug actually does in the body.
How Oxymetholone Works
Oxymetholone is a synthetic derivative of testosterone. What makes it unusual among anabolic steroids is the structural tweak at the 17th carbon position of the molecule, a change called 17-alpha alkylation. That modification allows the drug to survive a first pass through the liver when taken by mouth, which is why Anadrol comes as a tablet rather than an injection. The trade-off is that the same liver-resistant structure makes it harder on the liver than injectable steroids that bypass the digestive tract entirely.
Once in the bloodstream, oxymetholone binds to androgen receptors in muscle, bone, and other tissues, triggering the same protein-building signals that testosterone does but at a much stronger magnitude per milligram. One of its most clinically relevant actions is stimulating the kidneys to produce erythropoietin, the hormone that tells bone marrow to make more red blood cells. In a study of patients with sickle cell anemia, six patients treated with androgen therapy showed more than a fivefold increase in urinary erythropoietin, and their red cell mass rose by anywhere from 17% to 75% above baseline.2PubMed Central. Oxymetholone treatment for sickle cell anemia That ability to dramatically boost red blood cell counts is the basis of oxymetholone’s primary medical use.
FDA-Approved Use for Anemia
Anadrol’s official indication is the treatment of anemias caused by deficient red cell production. This includes aplastic anemia, a condition where the bone marrow fails to produce enough blood cells, as well as certain other forms of bone marrow failure. While newer drugs like erythropoiesis-stimulating agents and immunosuppressive therapies have become standard first-line treatments for many of these conditions, oxymetholone still fills a role when those options are unavailable, unaffordable, or ineffective.
A recent study of 110 adult patients with aplastic anemia found that oxymetholone produced an overall response rate of about 56% at six months. Roughly 13% of those patients achieved a complete response, meaning their blood counts returned to normal ranges, while another 44% achieved a partial response. Even among patients with severe or very severe aplastic anemia, the overall response rate held at about 51%. The median time from starting oxymetholone to becoming free of blood transfusions was roughly 12 weeks.3PubMed Central. Good response to oxymetholone in adult aplastic anemia Those numbers are meaningful in a disease where untreated severe cases can be fatal. For patients in settings where expensive immunosuppressive regimens or bone marrow transplants are not readily available, oxymetholone remains a practical and sometimes life-saving treatment.
Treating Muscle Wasting and Weakness
Beyond anemia, oxymetholone has been studied as a treatment for muscle wasting in chronic illness. The most well-known clinical trial in this area involved men and women with HIV-related wasting, a condition marked by involuntary loss of body weight, lean tissue, and physical function. In that placebo-controlled trial, patients taking oxymetholone gained roughly 3 to 3.5 kilograms of body weight over the study period, compared to about 1 kilogram in the placebo group. More importantly, the gains were not just water or fat. Body cell mass, a measure of the metabolically active tissue in the body, increased by nearly 4 kilograms in one dosing group. Patients also reported better appetite, increased food intake, greater well-being, and less weakness.4PubMed. Oxymetholone for the treatment of HIV-wasting: a double-blind, randomized, placebo-controlled phase III trial in eugonadal men and women
A separate trial in patients on hemodialysis, who commonly lose muscle due to the physical stress of kidney failure and dialysis itself, found similar patterns. Patients given oxymetholone gained fat-free mass, lost fat mass, and showed measurably improved handgrip strength, physical functioning scores, and increases in the cross-sectional area of type I muscle fibers. At the molecular level, muscle tissue from treated patients showed higher activity of growth-signaling molecules like IGF-I and IGF-II receptors.5PubMed Central. Effect of oral anabolic steroid on muscle strength and muscle growth in hemodialysis patients In both populations, the drug did what it is pharmacologically designed to do: shift the body’s balance toward building tissue rather than breaking it down.
Why Bodybuilders Use It and What They Get Wrong
Oxymetholone’s reputation in the bodybuilding world comes from exactly those tissue-building properties, amplified by the doses that non-medical users typically take. In clinical settings, doses tend to fall in the range of 1 to 5 milligrams per kilogram of body weight per day, depending on the condition being treated. Underground use often starts at 50 milligrams daily and escalates to 100 milligrams or more, sometimes stacked with other steroids. The rapid weight gain users report in the first few weeks is real, but a substantial portion of it is water retention. Oxymetholone causes the body to hold onto fluid, which inflates muscles visually but does not represent permanent tissue growth. When the drug is stopped, much of that water weight comes off, leaving users with a smaller proportion of lasting muscle gain than they expected.
There is also a persistent myth that Anadrol does not convert to estrogen through the usual pathway, so users believe they are safe from estrogen-related side effects like gynecomastia (breast tissue growth in men). In reality, oxymetholone appears to activate estrogen receptors directly or through a metabolite, rather than through the standard aromatase enzyme. This means that the typical anti-estrogen drugs many steroid users take alongside their cycles may not fully block the estrogenic effects of Anadrol. The practical result is that users can develop puffiness, water retention, and breast tenderness despite taking precautions that would work for other steroids.
Liver Toxicity
The most serious side effect of oxymetholone is damage to the liver. As a 17-alpha-alkylated steroid, it passes through the liver largely intact, and the liver bears the brunt of processing it. The most commonly reported liver problem is cholestatic jaundice, a condition where bile flow is disrupted and bilirubin builds up in the blood, turning the skin and eyes yellow.1PubMed. Review of oxymetholone: a 17alpha-alkylated anabolic-androgenic steroid Less common but more dangerous liver complications include peliosis hepatis, a condition where blood-filled cysts form inside the liver, and hepatic tumors, both benign and malignant.
The underlying mechanisms involve disrupted antioxidant defenses in liver cells, increased bile acid production, and stimulation of liver cell growth that can become abnormal over time.6PubMed Central. Anabolic androgenic steroid-induced liver injury: An update In the hemodialysis trial described earlier, liver enzymes rose significantly in the oxymetholone group compared to placebo, though the number of patients whose levels spiked to more than three times the upper limit of normal was not statistically different between groups.5PubMed Central. Effect of oral anabolic steroid on muscle strength and muscle growth in hemodialysis patients That finding is a good illustration of how oxymetholone’s liver effects work in practice: nearly everyone taking it shows some stress on the liver, but outright liver failure is relatively rare in supervised, time-limited medical use. The danger escalates dramatically with higher doses, longer durations, pre-existing liver conditions, and the combination with other liver-stressing substances like alcohol or acetaminophen.
Clinicians monitoring patients on oxymetholone typically check liver function tests regularly and stop the drug if enzymes climb to dangerous levels. In the aplastic anemia study, 17 patients had to stop the drug early due to side effects, and those patients were included in the analysis as non-responders.3PubMed Central. Good response to oxymetholone in adult aplastic anemia That kind of active monitoring is exactly what separates supervised medical use from unsupervised bodybuilding use, where liver damage can progress silently until symptoms become severe.
Hormonal Suppression and Recovery
Like all anabolic steroids, oxymetholone suppresses the body’s own production of testosterone. The mechanism is straightforward: when androgen levels in the blood are artificially elevated, the brain’s signaling system reduces its output of the hormones that tell the testes to produce testosterone. With prolonged use, the testes shrink from inactivity, and sperm production drops, sometimes to zero. This cluster of effects is known as anabolic steroid-induced hypogonadism.
The question most users want answered is whether this reverses when the drug is stopped. A scoping review of the evidence found that recovery depends heavily on age and the degree of steroid abuse. Physical changes like testicular atrophy generally do recover over a period of months to years after stopping.7PubMed Central. Physical, psychological and biochemical recovery from anabolic steroid-induced hypogonadism: a scoping review Younger users and those who used for shorter periods tend to bounce back more completely. Older users and those who ran high-dose cycles for years may never fully recover natural testosterone production and can end up dependent on hormone replacement therapy for life. The psychological side of recovery, including mood disturbances, low libido, and fatigue during the months when the body’s hormonal axis is trying to restart, is a part of the equation that users rarely anticipate before starting.
Cardiovascular and Other Side Effects
The side-effect profile of oxymetholone extends well beyond the liver and the hormonal system. Cardiovascular risk is a major concern. Anabolic steroids in general, and oral 17-alpha-alkylated steroids in particular, tend to worsen lipid profiles. They drive down HDL cholesterol (the protective kind) and can raise LDL cholesterol, shifting the balance in a direction that promotes plaque buildup in arteries. Oxymetholone’s strong tendency to cause water retention also raises blood pressure in many users, adding another layer of cardiovascular strain.
Other commonly reported side effects include acne, oily skin, accelerated hair loss in those genetically predisposed to male-pattern baldness, and mood changes ranging from irritability to frank aggression. Women taking oxymetholone for medical reasons can experience virilization, the development of masculine characteristics like deepening of the voice, facial hair growth, and changes in menstrual patterns. Some of these changes, particularly voice deepening, may not fully reverse after stopping the drug. In children and adolescents, oxymetholone can cause premature closure of growth plates in bones, permanently stunting height. This is one reason pediatric use requires extremely careful dose management and regular monitoring of bone age.
How Oxymetholone Compares to Other Oral Steroids
Among oral anabolic steroids, oxymetholone sits at the extreme end of the potency spectrum. It produces faster and more dramatic weight and strength gains than most alternatives, but it also produces more side effects. Other oral steroids that share the 17-alpha-alkylated structure carry similar liver risks, though the severity varies. Oxymetholone’s particular combination of strong androgenic effects, high estrogenic activity through a non-standard pathway, and pronounced water retention makes it a drug that produces very visible results quickly but at a cost that many users underestimate.
In clinical medicine, the comparison that matters more is between oxymetholone and non-steroidal treatments for the same conditions. For aplastic anemia, immunosuppressive therapy and stem cell transplants have higher success rates in eligible patients, but they are vastly more expensive and require specialized medical infrastructure. For HIV wasting, appetite stimulants and targeted nutritional support are often tried first, with oxymetholone or similar agents reserved for cases that do not respond. The drug’s niche is situations where its benefits, measured in red blood cell counts, body weight, or functional strength, outweigh risks that would be unacceptable in a healthy person.
Legal Status and the Gap Between Medical and Non-Medical Use
Oxymetholone is classified as a Schedule III controlled substance in the United States, placing it in the same legal category as other anabolic steroids. Possessing it without a prescription is a federal crime, and distributing it carries stiffer penalties. Despite this, it circulates widely on the black market and through online sources, often manufactured in underground labs with no quality control. The purity and actual content of these products vary wildly. Independent testing of underground steroid products has repeatedly found tablets that contain more, less, or entirely different compounds than what the label claims.
The gap between medical and non-medical use is not just legal but practical. A patient with aplastic anemia taking oxymetholone under medical supervision gets regular blood tests, dose adjustments based on response and side effects, and a defined treatment endpoint. A bodybuilder self-administering the same drug typically has none of those safeguards. The dose may be guided by forum advice rather than clinical evidence, liver function goes unchecked, and the cycle length is determined by aesthetic goals rather than safety thresholds. This is the context in which most of the serious adverse events associated with oxymetholone occur. The drug is not inherently more dangerous than many prescription medications with narrow safety margins. It becomes dangerous when the monitoring that makes it manageable is removed.
What Happens When You Stop
Discontinuing oxymetholone triggers a predictable sequence of changes. Water retention drops within the first week or two, and the scale can fall by several kilograms depending on how much fluid the user was holding. Some of the muscle gained during a cycle remains, but the amount varies based on training, diet, and whether the user’s natural testosterone production rebounds quickly enough to maintain the new tissue. Without adequate hormonal support, muscle gained on cycle can atrophy in the weeks and months that follow.
Liver values typically begin to normalize within weeks of stopping, assuming no lasting structural damage has occurred. The cholestatic jaundice associated with 17-alpha-alkylated steroids usually resolves after the drug is cleared, though peliosis hepatis and hepatic tumors, if they have developed, may require longer monitoring or intervention. Hormonal recovery, as noted, is the most variable piece. Some users feel normal within a few months. Others experience a prolonged period of low testosterone symptoms, including fatigue, depression, loss of libido, and difficulty maintaining muscle mass, that can stretch well past a year. The uncertainty of that recovery timeline is arguably the most underappreciated long-term risk of oxymetholone use outside of medical supervision.
Detection in Drug Testing
Oxymetholone and its metabolites are detectable in urine for several weeks after the last dose, making it one of the more easily caught substances in competitive sports. Anti-doping laboratories use mass spectrometry to identify specific breakdown products of the drug. The detection window depends on the dose used, the duration of use, and individual metabolism, but athletes have tested positive for oxymetholone metabolites well over a month after their last tablet. This long detection window, combined with the drug’s tendency to cause conspicuous water retention and rapid weight changes, makes it a poor choice for anyone subject to drug testing. Its use in competitive sports has declined relative to other performance-enhancing drugs that are harder to detect, though it still appears in doping violations periodically.
For users not subject to testing, the detection window is irrelevant, but the metabolite profile matters for another reason: it confirms how long the drug and its active byproducts remain in the body affecting tissues. Liver stress, hormonal suppression, and cardiovascular strain do not end the moment the last pill is swallowed. The biological footprint of a cycle extends weeks beyond the final dose, and planning recovery accordingly is something many non-medical users fail to account for.